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Littérature scientifique sur le sujet « Molecular Thin film »

Auteur : Grafiati
Publié le 1 avril 2023

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Articles de revues sur le sujet "Molecular Thin film"

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Hu, Y.-Z., H. Wang, Y. Guo et L.-Q. Zheng. « Molecular dynamics simulation of ultra-thin lubricating films ». Proceedings of the Institution of Mechanical Engineers, Part J : Journal of Engineering Tribology 212, no 3 (1 mars 1998) : 165–70. http://dx.doi.org/10.1243/1350650981541976.

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Molecular dynamics simulation has been performed in the present study for a Lennard-Jones (LJ) fluid in Poiseuille flow to examine the Theological behaviour of ultra-thin lubricating films. The results show that as two solid walls continuously approach each other, the effective viscosity of the confined fluid increases and goes towards divergence; the critical pressure of the phase transition declines as the film thickness reduces; when the separation exceeds ten molecular layers, however, the pressure curve slopes gently and tends to an asymptotic value-the bulk transition pressure of the lubricant; and an in-plane ordering structure will develop in the film, which originates from the wall-fluid interface and grows towards the middle of the film as the system pressure increases. It is concluded that the rheological performance of the lubricant may become film thickness dependent and a solid-liquid transition may be induced when the film is molecularly thin.
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Moustakas, Theodore D. « Molecular Beam Epitaxy : Thin Film Growth and Surface Studies ». MRS Bulletin 13, no 11 (novembre 1988) : 29–36. http://dx.doi.org/10.1557/s0883769400063892.

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Molecular Beam Epitaxy (MBE) is a thin film deposition process in which thermal beams of atoms or molecules react on the clean surface of a single-crystalline substrate, held at high temperatures under ultrahigh vacuum conditions, to form an epitaxial film. Thus, contrary to the CVD processes described in the other articles, the MBE process is a physical method of thin film deposition.The vacuum requirements for the MBE process are typically better than 10−10torr. This makes it possible to grow epitaxial films with high purity and excellent crystal quality at relatively low substrate temperatures. Additionally, the ultrahigh vacuum environment allows the study of surface, interface, and bulk properties of the growing film in real time, by employing a variety of structural and analytical probes.Although the MBE deposition process was first proposed by Günther in 1958, its implementation had to wait for the development of the ultrahigh vacuum technology. In 1968 Davey and Pankey successfully grew epitaxial GaAs films by the MBE process. At the same time Arthur's work on the kinetics of GaAs growth laid the groundwork for the growth of high quality MBE films of GaAs and other III-V compounds by Arthur and LePore and Cho.
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Lukes, J. R., D. Y. Li, X. G. Liang et C. L. Tien. « Molecular Dynamics Study of Solid Thin-Film Thermal Conductivity ». Journal of Heat Transfer 122, no 3 (1 mars 2000) : 536–43. http://dx.doi.org/10.1115/1.1288405.

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This study uses the molecular dynamics computational technique to investigate the thermal conductivity of solid thin films in the direction perpendicular to the film plane. In order to establish a benchmark reference, the computations are based on the widely used Lennard-Jones argon model due to its agreement with experimental liquid-phase data, its physically meaningful parameters, and its simple two-body form. Thermal conductivity increases with film thickness, as expected from thin-film experimental data and theoretical predictions. The calculated values are roughly 30 percent higher than anticipated. Varying the boundary conditions, heat flux, and lateral dimensions of the films causes no observable change in the thermal conductivity values. The present study also delineates the conditions necessary for meaningful thermal conductivity calculations and offers recommendations for efficient simulations. This work shows that molecular dynamics, applied under the correct conditions, is a viable tool for calculating the thermal conductivity of solid thin films. More generally, it demonstrates the potential of molecular dynamics for ascertaining microscale thermophysical properties in complex structures. [S0022-1481(00)02303-3]
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Whitten, David G., Tisato Kajiyama et Toyoki Kunitake. « Organic Thin Films : An Overview ». MRS Bulletin 20, no 6 (juin 1995) : 18–19. http://dx.doi.org/10.1557/s0883769400036927.

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The six articles comprising this issue of the MRS Bulletin deal with ultrathin films formed from organic molecules by a variety of techniques. In each case the component molecule forming the film is a relatively simple, single molecule which may or may not have important self-organizing properties that facilitate the formation of a film or related ordered molecular assembly. Taken together, the series of articles offer a concise look at the remarkable diversity and complexity of molecular thin films in terms of preparation and their properties.
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Del Caño, T., J. Duff et R. Aroca. « Molecular Spectra and Molecular Organization in Thin Solid Films of Bis(Neopentylimido) Perylene ». Applied Spectroscopy 56, no 6 (juin 2002) : 744–50. http://dx.doi.org/10.1366/000370202760077478.

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The synthesis, molecular spectra, and thin solid film properties of a perylene dye, bis(neopentylimido) perylene (BNPTCD),§ are reported. Absorption and emission molecular spectra are used to probe the structure of vacuum-evaporated thin films and Langmuir–Blodgett monolayers of BNPTCD. The experimental assignment of electronic, infrared, and Raman spectra are aided with calculated molecular structure and spectra using density functional theory (DFT) and Hartree–Fock (HF) computational methods at 6–31G level of theory. Characteristic vibrational modes and local symmetry of the planar perylene tetracarboxylic chromophore (PTCD) are used to extract molecular organization and film packing properties from spectral data collected using transmission and reflection-absorption (RAIRS) infrared spectroscopy. From the infrared spectra, using surface selection rules and polarization properties, it was extracted that the PTCD plane in BNPTCD is organized in the evaporated film with the plane head-on tilted over the substrate. After the molecular organization was identified, the effect of thermal annealing and solvent vapors on the film structure was examined. It is found that the PTCD plane turns to a flat-on orientation when the film is thermal annealed or solvent treated. The aggregation and molecular stacking in films was also inspected using the electronic absorption and fluorescence of monomers and aggregates.
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KADAU, K., R. MEYER et P. ENTEL. « MOLECULAR-DYNAMICS STUDY OF THIN IRON FILMS ON COPPER ». Surface Review and Letters 06, no 01 (février 1999) : 35–43. http://dx.doi.org/10.1142/s0218625x9900007x.

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We have studied the structural stability of thin γ-iron films on Cu(001) and Cu(111) substrates using molecular-dynamics simulations in combination with a semiempirical model. Experimentally, the stability of such films has turned out to depend on (growth) temperature and film thickness. On increasing the thickness or decreasing the temperature the films undergo a structural change to the bcc structure, which is well reproduced by our simulations. An analysis of the local atomic environment of the films after the structural transformation shows that, especially on Cu(001), only parts of the film accomplish the transformation into the bcc structure. Considerations of the atomic displacements during the transformation allow us to give an explanation of the different stability of the films on Cu(001) and Cu(111) as well as the observed orientational relationships.
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Baljon, Arlette R. C., et Mark O. Robbins. « Adhesion and Friction of Thin Films ». MRS Bulletin 22, no 1 (janvier 1997) : 22–26. http://dx.doi.org/10.1557/s0883769400032292.

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Polymers are routinely placed between solid walls to provide lubrication or adhesion. Their function in these roles depends critically on the degree of dissipation within the polymer film and at the film/wall interface as the film shears or ruptures. Good lubrication is achieved by minimizing frictional dissipation while dissipation increases the strength of adhesive bonds.Gent and Schultz suggested a direct link between frictional losses and the adhesive performance of polymers. This correspondence has been supported by recent experiments and by some of the molecular-dynamics simulations to be described. However we find that the correspondence breaks down when the molecular motion producing dissipation occurs at different locations during shear and rupture. In the following sections, we discuss the types of rate-dependent dissipation observed in thin films and the different factors that control whether dissipation occurs within the polymer or at the wall/film interface. The results suggest an origin for interesting memory effects observed in surface-force-apparatus (SFA) experiments on thin films and expose the atomic-scale processes that produce dissipation during internal rupture of a thin film.
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NAGASAKA, MASAOMI, DAI IWASAKI, NAONORI SAKAMOTO, NAOKI WAKIYA et HISAO SUZUKI. « BaTiO3 THIN FILM BY CSD FROM MOLECULAR-DESIGNED PRECURSOR SOLUTION ». Functional Materials Letters 05, no 02 (juin 2012) : 1260007. http://dx.doi.org/10.1142/s1793604712600077.

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BaTiO3 (BT) thin films were deposited by the cost effective method of a chemical solution deposition (CSD). 0.3 M BT precursor solution was prepared by the partial hydrolysis method. Partially hydrolyzed Ti -alkoxide and Ba precursor solution was reacted to prepare the highly polymerized BT precursor solution. BT precursor solution was spin-coated on a Pt/Ti/SiO2/Si substrate with (100)-oriented LaNiO 3 (LNO) thin film electrode. In addition, effect of the pre-annealing at 600°C in O2 atmosphere was elucidated by measuring the electrical properties of the resulting BT thin films deposited by the different annealing process. As a result, molecular-design of the BT precursor and a LNO thin film electrode were effective to enhance the electrical properties of the resultant BT thin films, as well as 600°C pre-annealing.
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Heutz, Sandrine, Paul Sullivan, Brett M. Sanderson, Stephan M. Schultes et Tim S. Jones. « Molecular Thin Films for Optoelectronic Applications ». Solid State Phenomena 121-123 (mars 2007) : 373–76. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.373.

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Organic molecular beam deposition (OMBD) is used for co-evaporation of copper phthalocyanine (CuPc) and C60 to form mixed films. Although pure single layers are crystalline, mixing leads to amorphous films in most cases, although phase segregation occurs for high concentrations of C60. An underlying CuPc single layer suppresses the segregation and leads to a homogeneous CuPc/C60 mixed film for all layer compositions. These effects are exploited in photovoltaic (PV) devices, where new architectures to improve device performance are investigated. Mixing the CuPc and C60 improves device performance, with the maximum efficiency (ηp = 1.17%) reached for devices containing 75% CuPc in the mixed layer, surrounded by pure layers at the electrode interfaces.
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Kato, T., et H. Matsuoka. « Molecular layering in thin-film elastohydrodynamics ». Proceedings of the Institution of Mechanical Engineers, Part J : Journal of Engineering Tribology 213, no 5 (mai 1999) : 363–70. http://dx.doi.org/10.1243/1350650991542730.

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Thèses sur le sujet "Molecular Thin film"

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Okazaki, Nobuharu. « Molecular rectification with identical metal electrodes at low temperatures ». Thesis, University of Exeter, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251190.

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Heutz, Sandrine Elizabeth Monique. « Structural, spectroscopic and morphological properties of molecular thin film heterostructures ». Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252184.

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Gilchrist, James. « Nanoscale analysis of molecular photovoltaic thin film structures and interfaces ». Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/25023.

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Thin films of organic semiconducting materials, such as copper phthalocyanine (CuPc) and C60, can be used in photovoltaic devices. The interface between these materials is the site of exciton dissociation, and thus a key region of interest in their study. The processes that occur within these films and at interfaces are governed by the local morphology and structure. Studying these films and interfaces at high spatial resolution has previously been challenging given their soft nature and scale. Using electron transparent cross-sections prepared with a focussed ion beam (FIB), high resolution transmission electron microscopy (HRTEM) has been used to probe the local crystallography of three archetypical organic photovoltaic device structures grown on silicon and indium tin oxide (ITO). In HRTEM images lattice fringes of unprecedented clarity are observed, validating the optimised FIB method. HRTEM examination of device structure cross-sections on silicon reveals lattice fringes throughout pure films of CuPc and C60. The structure of the CuPc thin film can be correlated with bulk characterisation methods however, the observation of stacking faults demonstrates film non-uniformity. Lattice fringes in C60 films show an orientation preference with respect to the interface, which allows conclusions to be made about C60 when grown on molecular films. Mixed films show no lattice fringes. Structures grown on ITO are more complex than those on silicon, which is attributed the relatively rougher growth surface. Due to this rougher surface, the morphological changes occurring result in reduced crystallinity, a conclusion supported by bulk characterisation methods. The cross-sectional methodology has been extended to thicker films, revealing the presence of structural deviations that lie parallel to the surface. Scanning transmission electron microscopy, in combination with energy dispersive X-ray spectroscopy, high resolution quantitative compositional mapping reveals the morphology of the interface for the structures studied. This been correlated with the morphology of single CuPc film surfaces, with the conclusion that morphology of the CuPc surface remains unchanged after C60 film growth.
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Hu, Yanhong. « Molecular dynamics studies of thin film nucleation and substrate modification ». [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000955.

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Singh, Rajeev. « Experimental characterization of thin film thermoelectric materials and film deposition via molecular beam epitaxy / ». Diss., Digital Dissertations Database. Restricted to UC campuses, 2008. http://uclibs.org/PID/11984.

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Schünemann, Christoph. « Organic Small Molecules : Correlation between Molecular Structure, Thin Film Growth, and Solar Cell Performance ». Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-105169.

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Das wesentliche Ziel dieser Doktorarbeit ist es, die Zusammenhänge zwischen der Struktur von kleinen organischen Molekülen, deren Anordnung in der Dünnschicht und der Effizienz organischer Solarzellen zu beleuchten. Die Kombination der komplementären Methoden spektroskopischer Ellipsometrie (VASE) und Röntgenstreuung, vor allem der unter streifendem Einfall (GIXRD), hat sich als sehr effiient für die Strukturuntersuchungen organischer Dünnschichten erwiesen. Zusammen geben sie einen detailreichen Einblick in die intermolekulare Anordnung, die Kristallinität, die molekulare Orientierung, die optischen Konstanten n und k und die Phasenseparation von organischen Schichten. Zusätzlich wird die Topografie der organischen Dünnschicht mit Rasterkraftmikroskopie untersucht. Der erste Fokus liegt auf der Analyse des Dünnschichtwachstums von Zink-Phthalocyanin (ZnPc) Einzelschichten. Für alle untersuchten Schichtdicken (5, 10, 25, 50 nm) und Substrattemperaturen (Tsub=30°C, 60°C, 90°C) zeigt ZnPc ein kristallines Schichtwachstum mit aufrecht stehenden ZnPc Molekülen. Um effiziente organische Solarzellen herzustellen, werden Donor- und Akzeptormoleküle üblicherweise koverdampft. Bei der Mischung von Donor- und Akzeptormolekülen bildet sich eine gewisse Phasenseparation aus, deren Form wesentlich für die Ladungsträgerextraktion entlang der Perkolationpfade ist. Der Ursprung dieser Phasenseparation wird innerhalb dieser Arbeit experimentell für ZnPc:C60 Absorber-Mischschichten untersucht. Um die Ausprägung der Phasenseparation zu variieren, werden verschiedene Tsub (30°C, 100°C, 140°C) und Mischverhältnisse (6:1, 3:1, 2:1, 1:1, 1:2, 1:3, 1:6) bei der Koverdampfung von ZnPc und C60 angewendet. GIXRD Messungen zeigen, dass hier der bevorzugte Kristallisationsprozess von C60 Molekülen die treibende Kraft für eine effiziente Phasenseparation ist. Solarzellen, die ZnPc:C60 Mischschichten mit verbesserter Phasenseparation enthalten (Tsub=140°C, 1:1), zeigen eine verbesserte Ladungsträgerextraktion und somit eine höhere Effizienz von 3,0% im Vergleich zu 2,5% für die entsprechende Referenzsolarzelle (Tsub=30°C, 1:1). Im zweiten Teil der Arbeit wird der Einfluss der Molekülorientierung auf die Dünnschichtabsorption beispielhaft an ZnPc und Diindenoperylen (DIP) untersucht. DIP und ZnPc Moleküle, die auf schwach wechselwirkenden Substraten wie Glas, SiO2, amorphen organischen Transportschichten oder C60 aufgedampft sind, zeigen eine eher stehende Orientierung innerhalb der Dünnschicht in Bezug zur Substratoberfläche. Im Gegensatz dazu führt die Abscheidung auf stark wechselwirkenden Substraten, wie z.B. einer Gold- oder Silberschicht oder 0.5 nm bis 2 nm dünnen PTCDA (3,4,9,10-Perylentetracarbonsäuredianhydrid) Templatschichten laut GIXRD und VASE Messungen dazu, dass sich die ZnPc und DIP Moleküle eher flach liegend orientieren. Dies führt zu einer wesentlich besseren Dünnschichtabsorption da das molekulare Übergangsdipolmoment jeweils innerhalb der Ebene des ZnPc und des DIP Moleküls liegt. Ein Einbetten von Gold- oder Silberzwischenschichten in organischen Solarzellen führt leider zu keinen klaren Abhängigkeiten, da die verbesserte Absorption durch die flach liegenden Moleküle von Mikrokavitäts- und plasmonischen Effekten überlagert wird. Ebenso wenig führte das Einfügen einer PTCDA-Zwischenschicht in organischen Solarzellen zum Erfolg, da hier Transportbarrieren den Effekt der verbesserten Absorption überlagern. Das letzte Kapitel konzentriert sich auf den Einfluss der Molekülstruktur auf das Dünnschichtwachstum am Beispiel von DIP und dessen Derivaten Ph4-DIP und P4-Ph4-DIP, Isoviolanthron und Bis-nFl-NTCDI (N,N-Bis(fluorene-2-yl)-naphthalenetetra-carboxylic Diimid) Derivaten. GIXRD Messungen belegen deutlich, dass die sterischen Behinderungen, hervorgerufen durch die Phenylringe (für Ph4-DIP und P4-Ph4-DIP) und Seitenketten (für Bis-nFl-NTCDI), ein amorphes Schichtwachstum induzieren. Im Vergleich sind die Dünnschichten von DIP und Bis-HFl-NTCDI kristallin. Bezüglich der Molekülorientierung und folglich der Absorption von DIP und dessen Derivaten kann ein starker Einfluss des Schichtwachstums beobachtet werden. In Solarzellen verhindert die Präsenz der Phenylringe eine effiziente Phasenseparation der Mischschichten aus (P4-)Ph4-DIP:C60, was zu einer verschlechterten Ladungsträgerextraktion und damit zu einem reduzierten Füllfaktor (FF) von 52% im Vergleich zu dem entsprechender DIP:C60 Solarzellen mit FF=62% führt Die Untersuchungen an der Bis-nFl-NTICDI Serie zeigen ein ähnliches Ergebnis: Auch hier zeichnen sich die amorphen Schichten aus Bis-nFl-NTCDI Molekülen mit Seitenketten durch schlechtere Transporteigenschaften aus als nanokristalline Bis-HFl-NTCDI Schichten
The aim of this thesis is to demonstrate correlations between the molecular structure of small organic molecules, their arrangement in thin films, and the solar cell performance. For structure analysis of the organic thin films, the combination of variable angle spectroscopic ellipsometry (VASE) and grazing incidence X-ray diffraction (GIXRD) as complementary methods turned out to be a powerful combination. Using both methods, it is possible to obtain information about the crystallinity, crystallite size, intermolecular arrangement, mean molecular orientation, optical constants n and k, and phase separation within thin films. In addition, the topography of thin films is analyzed by atomic force microscopy. First, the thin film morphology of pristine zinc-phthalocyanine (ZnPc) films deposited at different substrate temperatures (Tsub=30°C, 60°C, 90°C) and for varying film thicknesses (5, 10, 25, 50 nm) is investigated. The ZnPc films grow highly crystalline with an upright standing molecular orientation with respect to the substrate surface for all investigated Tsub and all film thicknesses. In effcient organic solar cells, donor and acceptor molecules are commonly co-deposited to form a blend absorber film. This is usually accompanied by a certain phase separation between donor and acceptor molecules leads to a formation of percolation paths necessary to extract electrons and holes towards the electrodes. For ZnPc:C60 blends the origin of this phase separation process is analyzed by investigating different degrees of phase separation induced by film deposition at different Tsub (30°C, 100°C, 140°C) and for different blend ratios (6:1, ... , 1:6 (vol%)). GIXRD measurements indicate that the preferred crystallization of C60 is the driving force for good phase separation. Solar cells with improved phase separation of ZnPc:C60 blends (Tsub=140°C, 1:1) reveal a better charge carrier extraction and thus enhanced effciencies of 3.0% in comparison to 2.5% for the reference device (Tsub=30°C, 1:1). In the second part, the impact of molecular orientation within the absorber thin films on light harvesting is examined for pristine ZnPc and diindenoperylene (DIP) films. For film deposition on weakly interacting substrates like glass, SiO2, amorphous organic transport films, or C60, the orientation of DIP and ZnPc molecules is found to be upright standing. In contrast, GIXRD and VASE measurements show that films deposited onto strongly interacting substrates like Au and Ag, as well as on thin PTCDA templating layers lead to nearly flat-lying ZnPc and DIP molecules. Since the molecular transition dipole moment is oriented in the plane of the DIP and ZnPc molecules, the light absorption in films with flat-lying molecules is strongly improved. Unfortunately, an implementation of Au or Ag sublayers in organic solar cells does not result in reliable dependencies since the enhanced absorption by an improved molecular orientation is superimposed by different effects like microcavity and plasmonic effects. The implementation of PTCDA interlayers leads to transport barriers making the solar cell data interpretation difficult. In the last part, the influence of molecular structure on thin film growth is studied for DIP and its derivatives Ph4-DIP and P4-Ph4-DIP, isoviolanthrone, and Bis-nFl-NTCDI derivatives. GIXRD measurements reveal that steric hindrance is induced by the addition of side chains (for Bis-nFl-NTCDI) and phenyl rings (for Ph4-DIP and P4-Ph4-DIP) (N,N-Bis(fluorene-2-yl)-naphthalenetetra-carboxylic diimide) leading to an amorphous thin film growth. In contrast, DIP films and Bis-HFl-NTCDI films are found to be crystalline. The mean molecular orientation and hence the absorption is strongly affected by the different growth modes of DIP and its derivatives. In OSC, the presence of the phenyl rings prevents an effcient phase separation for (P4-)Ph4-DIP:C60 blends which causes diminished charge extraction in comparison to the crystalline DIP:C60 blends. For the Bis-nFl-NTCDI series, the transport properties are significantly worse in the amorphous films composed of Bis-nFl-NTCDI derivatives with alkyl chains in comparison to the nanocrystalline films made of the bare Bis-HFl-NTCDI
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Yu, Shun. « Molecular Interaction of Thin Film Photosensitive Organic Dyes on TiO2 Surfaces ». Doctoral thesis, KTH, Materialfysik, MF, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-47354.

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The photosensitive molecule adsorption on titanium dioxide (TiO2) forms the so-called “dye sensitized TiO2” system, a typical organic/oxide heterojunction, which is of great interest in catalysis and energy applications, e.g. dye-sensitized solar cell (DSSC). Traditionally, the transition metal complex dyes are the focus of the study. However, as the fast development of the organic semiconductors and invention of new pure organic dyes, it is necessary to expand the research horizon to cover these molecules and concrete the fundamental understanding of their basic properties, especially during sensitization.In this work, we focus on two different photosensitive molecules: phthalocyanines and triphenylamine-based dyes. Phthalocyanines are organic semiconductors with symmetric macro aromatic molecular structures. They possess good photoelectrical properties and good thermal and chemical stability, which make them widely used in the organic electronic industries. Triphenylamine-based dyes are new types of pure organic dyes which deliver high efficiency and reduce the cost of DSSC. They can be nominated as one of the strong candidates to substitute the ruthenium complex dyes in DSSC. The researches were carried out using classic surface science techniques on single crystal substrates and under ultrahigh vacuum condition. The photosensitive molecules were deposited by organic molecular beam deposition. The substrate reconstruction and ordering were checked by low energy electron diffraction. The molecular electronic, geometric structures and charge transfer properties were characterized by photoelectron spectroscopy, near edge X-ray absorption fine structure spectroscopy and resonant photoelectron spectroscopy (RPES). Scanning tunneling microscopy is used to directly image the molecular adsorption.For phthalocyanines, we select MgPc, ZnPc, FePc and TiOPc, which showed a general charge transfer from molecule to the substrate when adsorbed on rutile TiO2(110) surface with 1×1 and 1×2 reconstructions. This charge transfer can be prevented by modifying the TiO2 surface with pyridine derivatives (4-tert-butyl pyridine (4TBP), 2,2’-bipyridine and 4,4’-bipyridine), and furthermore the energy level alignment at the interface is modified by the surface dipole established by the pyridine molecules. Annealing also plays an important role to control the molecular structure and change the electronic structure together with the charge transfer properties, shown by TiOPc film. Special discussions were done for 4TBP for its ability to shift the substrate band bending by healing the oxygen vacancies, which makes it an important additive in the DSSC electrolyte. For the triphenylamine-based dye (TPAC), the systematic deposition enables the characterization of the coverage dependent changes of molecular electronic and geometric structures. The light polarization dependent charge transfer was revealed by RPES. Furthermore, the iodine doped TPAC on TiO2 were investigated to mimic the electrolyte/dye/TiO2 interface in the real DSSC.The whole work of this thesis aims to provide fundamental understanding of the interaction between photosensitive molecules on TiO2 surfaces at molecular level in the monolayer region, e.g. the formation of interfacial states and the coverage dependent atomic and electronic structures, etc. We explored the potential of the application of new dyes and modified of the existing system by identifying their advantage and disadvantage. The results may benefit the fields of dye syntheses, catalysis researches and designs of organic photovoltaic devices.
QC 20111114
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Kim, Younggu. « Novel organic polymeric and molecular thin-film devices for photonic applications ». College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/4164.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.
Thesis research directed by: Department of Electrical and Computer Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Wu, Yu. « Control of pentacene thin film growth by supersonic molecular beam deposition ». [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 2008. http://irs.ub.rug.nl/ppn/.

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Nakamura, Tomoya. « Molecular Orientation Control of Organic Semiconducting Materials for Thin Film Electronics ». Kyoto University, 2019. http://hdl.handle.net/2433/242523.

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Livres sur le sujet "Molecular Thin film"

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Thin-film organic photonics : Molecular layer deposition and applications. Boca Raton : Taylor & Francis, 2011.

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1950-, Konuma Mitsuharu, dir. Film deposition by plasma techniques. Berlin : Springer-Verlag, 1992.

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W, Göpel, et Ziegler Ch, dir. Nanostructures based on molecular materials. Weinheim : VCH, 1992.

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Albers, Willem M. Immobilisation of biomolecules onto organised molecular assemblies. Espoo [Finland] : Technical Research Centre of Finland, 1999.

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H, Richardson Tim, dir. Functional organic and polymeric materials : Molecular functionality--macroscopic reality. Chichester, England : Wiley, 2000.

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Workshop on the Molecular Engineering of Ultrathin Polymeric Films (1987 Davis, Calif.). Molecular engineering of ultrathin polymeric films : Proceedings of a Workshop on the Molecular Engineering of Ultrathin Polymeric Films, Davis, California, USA, February 18-20, 1987. Sous la direction de Stroeve P et Franses E. London : Elsevier Applied Science, 1987.

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1940-, Metzger R. M., Day P, Papavassiliou George C, North Atlantic Treaty Organization. Scientific Affairs Division. et Special Program on Condensed Systems of Low Dimensionality (NATO), dir. Lower-dimensional systems and molecular electronics. New York : Plenum Press, 1990.

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F, Lawrence Marcus, Society of Photo-optical Instrumentation Engineers. et Symposium on Laser Spectroscopy (1991 : Los Angeles, Calif.), dir. Photochemistry and photoelectrochemistry of organic and inorganic molecular thin films : 23-24 January 1991, Los Angeles, California. Bellingham, Wash., USA : SPIE, 1991.

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Noboru, Oyama, Birss Viola, Electrochemical Society. Physical Electrochemistry Division. et Electrochemical Society Meeting, dir. Proceedings of the Symposium on Molecular Functions of Electroactive Thin Films. Pennington, NJ : Electrochemical Society, 1999.

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United States. National Aeronautics and Space Administration., dir. Electro-optically active monomers : Synthesis and characterization of thin films of liquid crystalline substituted polyacetylenes. [Washington, DC : National Aeronautics and Space Administration, 1995.

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Plus de sources

Chapitres de livres sur le sujet "Molecular Thin film"

1

Yoshimura, Tetsuzo. « Thin-Film Molecular Nanophotonics ». Dans Photonics, 261–310. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119011750.ch8.

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Hasegawa, Takeshi. « Infrared and Raman Spectroscopy for Thin-Film Analysis ». Dans Molecular Soft-Interface Science, 77–85. Tokyo : Springer Japan, 2019. http://dx.doi.org/10.1007/978-4-431-56877-3_4.

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Zhou, Xiaowang, Jose Chavez et David Zubia. « Molecular Dynamics Analysis of Nanostructures ». Dans Advanced Characterization Techniques for Thin Film Solar Cells, 621–32. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527699025.ch22.

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Yoshimura, Tetsuzo. « Molecular Layer Deposition (MLD) ». Dans Molecular Layer Deposition for Tailored Organic Thin-Film Materials, 27–68. Boca Raton : CRC Press, 2023. http://dx.doi.org/10.1201/9781003094012-3.

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Zhang, Hongwei. « Thin-Film Hydration Followed by Extrusion Method for Liposome Preparation ». Dans Methods in Molecular Biology, 17–22. New York, NY : Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-6591-5_2.

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Zhang, Hongwei. « Thin-Film Hydration Followed by Extrusion Method for Liposome Preparation ». Dans Methods in Molecular Biology, 57–63. New York, NY : Springer US, 2023. http://dx.doi.org/10.1007/978-1-0716-2954-3_4.

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DeLeon, Robert L., Paras N. Prasad et James F. Garvey. « Thin-Film Formation by Laser-Assisted Molecular Beam Deposition ». Dans ACS Symposium Series, 183–97. Washington, DC : American Chemical Society, 1997. http://dx.doi.org/10.1021/bk-1997-0679.ch014.

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Joyce, Bruce A. « Semiconductor Thin Film Growth Dynamics During Molecular Beam Epitaxy ». Dans The Handbook of Surface Imaging and Visualization, 741–53. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9780367811815-54.

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Hall, Richard B. « Semiconductor Thin Film Growth Dynamics During Molecular Beam Epitaxy ». Dans The Handbook of Surface Imaging and Visualization, 755–66. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9780367811815-55.

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Kwo, J., M. Hong, D. J. Trevor, R. M. Fleming, A. E. White, R. C. Farrow, A. R. Kortan et K. T. Short. « Properties of in-Situ Superconducting Y1Ba2Cu3O7-x Films by Molecular Beam Epitaxy with an Activated Oxygen Source ». Dans Science and Technology of Thin Film Superconductors, 101–10. Boston, MA : Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-5658-5_12.

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Actes de conférences sur le sujet "Molecular Thin film"

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Glaeske, Holger, Karl-Heinz Feller et Victor Malyshev. « Bistable optical transmittivity in an ultrathin film of oriented molecular aggregates ». Dans Organic Thin Films. Washington, D.C. : OSA, 1999. http://dx.doi.org/10.1364/otf.1999.sae11.

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Johal, M. S., L. Smilowitz, J. M. Robinson, D. W. McBranch, D. Q. Li, W. S. Yang, Y. W. Cao, X. D. Chai, Y. S. Jiang et T. J. Li. « Spontaneously Self-Assembled Polar Multilayers With High Second-Order Optical Nonlinearity ». Dans Organic Thin Films for Photonic Applications. Washington, D.C. : Optica Publishing Group, 1997. http://dx.doi.org/10.1364/otfa.1997.the.17.

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Ordered molecular assemblies can lead to materials with extremely high second-order non-linear optical (NLO) properties [1] with applications in technologies such as optoelectronics [2] and permanent magnetism [3]. Although organic molecules with high nonlinearities are well known, it has been difficult to design bulk materials in which the molecules are highly ordered with the same orientation. In this work, we use second harmonic generation (SHG) to determine the second-order nonlinear coefficient (d33) of a spontananeously self-assembled, polar multilayer film (Figure 1) grown by drop casting on a silica substrate. Using ellipsometry to measure film thickness, the average molecular orientation of the chromophores is also determined.
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Wang, Qiangbin, Hongchen Gu, Manglai Gao et Siwei Zhang. « Fabrication and structure characterization of molecular deposition films ». Dans 4th International Conference on Thin Film Physics and Applications, sous la direction de Junhao Chu, Pulin Liu et Yong Chang. SPIE, 2000. http://dx.doi.org/10.1117/12.408363.

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Yakura, Yuji, Rebecca Shia, Tomikazu Sasaki et Fumio Ohuchi. « Structure and Properties of Fluoro-Aluminum Tetraphenyl-porphyrin (FA1TPP) Thin Films ». Dans Organic Thin Films for Photonic Applications. Washington, D.C. : Optica Publishing Group, 1995. http://dx.doi.org/10.1364/otfa.1995.md.20.

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In an attempt to design molecular arrays with adjustable periodicity in two dimension, fluoroaluminum tetraphenylporphyrin (FA1TPP) molecules were synthesized and fabricated into thin film forms. This paper describes our preliminary results on structure and properties of FA1TPP thin films.
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Lukes, Jennifer R., Xin-Gang Liang et Chang-Lin Tien. « Molecular Dynamics Study of Solid Thin-Film Thermal Conductivity ». Dans ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0709.

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Abstract This study explores the feasibility of using the molecular dynamics computational technique to predict the thermal conductivity of solid thin films in the direction perpendicular to the film plane. The results show that thermal conductivity, as expected from thin-film experimental data and theoretical predictions, decreases as film thickness is reduced. In the large-size limit, this method yields thermal conductivities which asymptote to a value comparable to experimental data. The calculations modestly overpredict thermal conductivity, probably due to the use of a too-steep intermolecular potential. Most interestingly, an unusual wave effect is revealed for thin film thermal conductivity. This effect may be a manifestation of phonon wave interference analogous to the interference of light which determines the radiative properties of thin films. It is also found that there are some temperature and computational domain size limitations on the applicability of molecular dynamics to the study of solid systems. A regime map is developed which delineates the conditions necessary for molecular dynamics to produce physically meaningful results. This work shows that molecular dynamics, applied under the correct conditions, is a viable tool for calculating the thermal conductivity of solid thin films. More generally, this work demonstrates the potential of molecular dynamics for ascertaining microscale thermophysical properties in more complex structures.
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Yang, Yong, Xue K. Lu, Da-Ming Huang, X. J. Chen, Zuimin Jiang, M. Yang, Y. L. Fan, D. W. Gong, G. Zhao et Xun Wang. « Photoluminescence from strained SiGe/Si quantum well structures grown by Si molecular beam epitaxy ». Dans Thin Film Physics and Applications : Second International Conference, sous la direction de Shixun Zhou, Yongling Wang, Yi-Xin Chen et Shuzheng Mao. SPIE, 1994. http://dx.doi.org/10.1117/12.190791.

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Lu, Jing-Hui, Zhi-Biao Hao, Zai-Yuan Ren et Yi Luo. « InP and InGaAsP materials grown by solid-source molecular beam epitaxy ». Dans 4th International Conference on Thin Film Physics and Applications, sous la direction de Junhao Chu, Pulin Liu et Yong Chang. SPIE, 2000. http://dx.doi.org/10.1117/12.408404.

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Rubner, Michael. « Molecular-Level Engineering of Polymer-Based Light-Emitting Devices ». Dans Organic Thin Films for Photonic Applications. Washington, D.C. : Optica Publishing Group, 1997. http://dx.doi.org/10.1364/otfa.1997.wd.5.

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Molecular-level processing schemes have been utilized to fabricate light emitting thin film devices from a variety of materials including conjugated polymers and polymers containing tris-chelated Ru(II) complexes.
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Chong, W. W. F., M. Teodorescu et H. Rahnejat. « Prediction of Load and Shear of Ultra-Thin Multi-Species Surface Films ». Dans ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71317.

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Unless protected by an inert gas atmosphere, micro-scale conjunctions are often separated by molecularly-thin adhered films. Therefore, predicting contact load, friction or adhesion, must consider the contribution of this layer to the overall contact problem. The contribution of an adhered layer can be accounted for using a simplified solution (e.g. an adjustment to the energy of adhesion to account for the liquid film). However, these methods cannot account for layers consisting of multiple species of molecules. The most common approach, which accounts for inter-molecular forces between molecules of various species, is a molecular dynamics simulation. However, this is time consuming, and therefore, often limited for small volumes of fluid and small scale contacts. The current paper proposes an alternative approach, where the pressure and shear between two smooth surfaces separated by an ultra-thin film is predicted using a statistical mechanics based model. This method accounts for the chemical structure of each species of molecules comprising the ultra-thin film, their concentration, intermolecular forces and adsorption to the wall. This approach is very fast, therefore, it can be easily included in a larger scale code predicting the behavior of the entire micro-scale mechanism. It was found that for a specified material of the solid boundary the model can predict the optimal concentration of each species of molecule in the intervening ultra-thin film, to minimize friction or adhesion.
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Chen, X. J., Q. H. Wang, D. W. Gong, Y. Yang, Hong Q. Lu, Fang Lu, Y. L. Fan et al. « Growth and characterization of boron delta function shaped doping layer in silicon by molecular beam epitaxy ». Dans Thin Film Physics and Applications : Second International Conference, sous la direction de Shixun Zhou, Yongling Wang, Yi-Xin Chen et Shuzheng Mao. SPIE, 1994. http://dx.doi.org/10.1117/12.190734.

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Rapports d'organisations sur le sujet "Molecular Thin film"

1

Griep, Mark H., Victor Rodriguez-Santiago, Andres A. Bujanda, Josh Martin, Shashi P. Karna et Daphne D. Pappas. Development of Thin-film Dye-sensitized Photoactive Materials on Ultra High Molecular Weight Polyethylene. Fort Belvoir, VA : Defense Technical Information Center, avril 2012. http://dx.doi.org/10.21236/ada559275.

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Paul W. Bohn. Molecular Aspects of Transport in Thin Films of Controlled Architecture. Office of Scientific and Technical Information (OSTI), avril 2009. http://dx.doi.org/10.2172/951203.

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Leung, P. T., Young S. Kim et Thomas P. George. Photoabsorption of Molecules at Corrugated Thin Metal Films. Fort Belvoir, VA : Defense Technical Information Center, février 1989. http://dx.doi.org/10.21236/ada205325.

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Leung, P. T., Young S. Kim et Thomas F. George. Decay of Molecules at Corrugated Thin Metal Films. Fort Belvoir, VA : Defense Technical Information Center, février 1989. http://dx.doi.org/10.21236/ada205487.

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Koberstein, Jeffrey T. Molecular Engineering of Thin Polymer Films Prepared from Functionally-Terminated Oligomers. Fort Belvoir, VA : Defense Technical Information Center, février 1995. http://dx.doi.org/10.21236/ada291681.

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Berman, G. P., G. D. Doolen, R. Mainieri, D. K. Campbell et V. A. Luchnikov. Molecular dynamics simulations of grain boundaries in thin nanocrystalline silicon films. Office of Scientific and Technical Information (OSTI), octobre 1997. http://dx.doi.org/10.2172/292865.

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May, Brelon, Jae Jin Kim, Evan Wong, Patrick Walker, William McMahon, Helio Moutinho, Aaron Ptak et David Young. Molecular Beam Epitaxy of Monocrystalline GaAs on Water-Soluble NaCl Thin Films. Office of Scientific and Technical Information (OSTI), février 2023. http://dx.doi.org/10.2172/1958607.

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Richmond, Geraldine. Molecular Processes Underlying the Structure and Assembly of Thin Films and Nanoparticles at Complex interfaces. Office of Scientific and Technical Information (OSTI), juin 2016. http://dx.doi.org/10.2172/1255449.

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ALEXEI G. VITUKHNOVSKY. RESEARCH ON THE ELECTRONIC AND OPTICAL PROPERTIES OF POLYMER AND OTHER ORGANIC MOLECULAR THIN FILMS. Office of Scientific and Technical Information (OSTI), septembre 1995. http://dx.doi.org/10.2172/758789.

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Taga, N., M. Maekawa, Y. Shigesato, I. Yasui et T. E. Haynes. Deposition of hetero-epitaxial In{sub 2}O{sub 3} thin films by molecular beam epitaxy. Office of Scientific and Technical Information (OSTI), mai 1996. http://dx.doi.org/10.2172/257414.

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