Готові списки джерел за темами / Exciton diffusion coefficient

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Добірка наукової літератури з теми "Exciton diffusion coefficient"

Автор: Grafiati

Опубліковано: 2 листопада 2024

Оновлено: 31 липня 2025

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Статті в журналах з теми "Exciton diffusion coefficient"

Sotome, Hikaru. "(Invited) Comprehensive Analysis of Exciton Diffusion with Time-Resolved Fluorescence Spectroscopy, Anisotropy and Imaging." ECS Meeting Abstracts MA2024-01, no. 13 (2024): 1065. http://dx.doi.org/10.1149/ma2024-01131065mtgabs.

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Excitons produced in materials play a crucial role in photo-energy conversion such as photovoltaics and electroluminescence devices. The temporal and spatial diffusion of excitons is a key factor for dominating the fundamental performance of optoelectronic materials. In this context, analysis of the exciton diffusion dynamics is an important issue for obtaining the rational design of the materials. Excitons diffusing in materials can be characterized by several parameters such as the energy level, orientation of the transition dipole moment and spatial distribution, and the detection of these

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Glazov, M. M., Z. A. Iakovlev, and S. Refaely-Abramson. "Phonon-induced exciton weak localization in two-dimensional semiconductors." Applied Physics Letters 121, no. 19 (2022): 192106. http://dx.doi.org/10.1063/5.0122633.

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We theoretically study the contribution of quantum effects to the exciton diffusion coefficient in atomically thin crystals. It is related to the weak localization caused by the interference of excitonic wavefunctions on the trajectories with closed loops. Due to the weak inelasticity of the exciton–phonon interaction, the effect is present even if the excitons are scattered by long-wavelength acoustic phonons. We consider exciton interaction with longitudinal acoustic phonons with linear dispersion and flexural phonons with quadratic dispersion. We identify the regimes where the weak localiza

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Ortiz, Angy L., Graham S. Collier, Dawn M. Marin, et al. "The effects of heavy atoms on the exciton diffusion properties in photoactive thin films of tetrakis(4-carbomethoxyphenyl)porphyrins." Journal of Materials Chemistry C 3, no. 6 (2015): 1243–49. http://dx.doi.org/10.1039/c4tc02232g.

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The exciton diffusion coefficient (D) and exciton diffusion length (L<sub>D</sub>) for three tetrakis(4-carbomethoxyphenyl)porphyrins were obtained by fitting the quenching efficiency and PL lifetime to a 3D exciton Monte Carlo ediffusion model.

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Shibu, Abhishek, Camilla Middleton, Carly O. Kwiatkowski, Meesha Kaushal, Jonathan H. Gillen, and Michael G. Walter. "Self-Assembly-Directed Exciton Diffusion in Solution-Processable Metalloporphyrin Thin Films." Molecules 27, no. 1 (2021): 35. http://dx.doi.org/10.3390/molecules27010035.

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The study of excited-state energy diffusion has had an important impact in the development and optimization of organic electronics. For instance, optimizing excited-state energy migration in the photoactive layer in an organic solar cell device has been shown to yield efficient solar energy conversion. Despite the crucial role that energy migration plays in molecular electronic device physics, there is still a great deal to be explored to establish how molecular orientation impacts energy diffusion mechanisms. In this work, we have synthesized a new library of solution-processable, Zn (alkoxyc

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Fugol’, I. Ya, A. G. Belov, E. M. Yurtaeva, and V. N. Svishchev. "Exciton-stimulated diffusion of xenon impurity in krypton cryocrystals." Soviet Journal of Low Temperature Physics 13, no. 3 (1987): 163–67. https://doi.org/10.1063/10.0031668.

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The intensity distribution of intrinsic and extrinsic luminescence as a function of the duration of irradiation by low-energy electrons was studied in xenon-krypton solid solutions. Low-temperature accelerated diffusion of xenon impurity atoms was observed at low concentrations. It is shown that this diffusion is stimulated by free excitons of the matrix, and a possible mechanism for this process is proposed. The restructuring of the structure of the solution is described qualitatively based on a model of the transport of excitations in the matrix. The coefficient of exciton-stimulated diffusi

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Fugol’, I. Ya, A. G. Belov, E. M. Yurtaeva, and V. N. Svishchev. "Exciton kinetics in xenon–krypton cryocrystals." Soviet Journal of Low Temperature Physics 12, no. 1 (1986): 39–43. https://doi.org/10.1063/10.0031423.

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On the basis of experimental studies of the luminescence of Xe–Kr solid solutions under electronic excitation as well as on the basis of an analysis of the results within the framework of the model of diffusion motion in Xe–Kr solid solutions, we examine the mechanisms of the migration and relaxation of electronic excitations of the matrix and also study the processes of energy transfer to the impurity states of K and Xe2. It is shown that in pure Kr crystals and low-concentration solutions (c &lt; 0.1 mole % Xe) the migration of excitations is due mainly to the diffusion of free excitons.

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Achtstein, Alexander W., Sabrine Ayari, Sophia Helmrich, et al. "Tuning exciton diffusion, mobility and emission line width in CdSe nanoplatelets via lateral size." Nanoscale 12, no. 46 (2020): 23521–31. http://dx.doi.org/10.1039/d0nr04745g.

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MORI, K., M. YOKOYA, H. NISHIMURA, M. NAKAYAMA, and H. ISHIBASHI. "SCINTILLATION MECHANISM OF Ce3+ DOPED Gd2SiO5." International Journal of Modern Physics B 15, no. 28n30 (2001): 3877–80. http://dx.doi.org/10.1142/s0217979201008895.

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Measuring the spectra of absorption, luminescence and excitation, and the decay times of the luminescence, at various temperatures, we investigate the scintillation mechanism of Ce 3+ doped Gd 2 SiO 5 (GSO:Ce). We conclude that the excitation energy created by gamma-ray irradiation relaxes to the core exciton states formed by the 4f-4f transitions of Gd 3+, and the core exciton migrates to collide with Ce 3+, and transfers the energy to Ce 3+ to emit the luminescence. We also conclude that the decay time of the Ce 3+ luminescence in GSO:Ce (70 ns for the case of 0.5 mol% of Ce concentration) i

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Donatini, Fabrice, and Julien Pernot. "Exciton diffusion coefficient measurement in ZnO nanowires under electron beam irradiation." Nanotechnology 29, no. 10 (2018): 105703. http://dx.doi.org/10.1088/1361-6528/aaa638.

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Londi, Giacomo, Rishat Dilmurat, Gabriele D’Avino, Vincent Lemaur, Yoann Olivier, and David Beljonne. "Comprehensive modelling study of singlet exciton diffusion in donor–acceptor dyads: when small changes in chemical structure matter." Physical Chemistry Chemical Physics 21, no. 45 (2019): 25023–34. http://dx.doi.org/10.1039/c9cp05201a.

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We compare two small π-conjugated donor–bridge–acceptor organic molecules with the aim of rationalizing the origin for the enhancement in singlet exciton diffusion coefficient and length in 1 with respect to 2.

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Більше джерел

Дисертації з теми "Exciton diffusion coefficient"

Diarra, Cheick Oumar. "Modélisation par dynamique moléculaire ab initio du transport des excitons et du transport thermique dans les semiconducteurs organiques pour la collecte d'énergie." Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAD013.

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L'exciton joue un rôle clé dans le fonctionnement des cellules solaires organiques (OSCs). Comprendre sa dynamique dans les semiconducteurs organiques est essentiel, notamment pour améliorer la longueur de diffusion, une propriété déterminante pour la performance des hétérojonctions planaires, envisagées comme une alternative plus stable aux hétérojonctions en volume (BHJ). Dans la première partie de cette thèse, nous avons développé une approche méthodologique robuste et polyvalente pour évaluer la longueur de diffusion de l'exciton dans les semiconducteurs organiques. Cette approche, basée s

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Jardin, Eric. "Détermination des coefficients de masquage et d'anéchoisme des matériaux acoustiques à partir de la mesure des coefficients de transmission et de réflexion de panneaux excités en incidence oblique ou de caractéristiques intrinsèques du matériau." Le Mans, 1997. http://www.theses.fr/1997LEMA1022.

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La mesure en cuve des coefficients complexes de reflexion r et de transmission t d'un panneau excite en incidence oblique permet de determiner les coefficients de masquage c#m et d'anechoisme c#a des materiaux utilises en acoustique sous-marine. Ces parametres definissent l'utilisation la plus adaptee en acoustique sous-marine de ces materiaux en tant que reflecteurs dur, reflecteurs mous, materiaux de masquage ou anechoiques. La premiere partie de ce travail repose sur la determination theorique en incidence oblique des coefficients c#a et c#m suivant r et t ou suivant les modules mecaniques

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Частини книг з теми "Exciton diffusion coefficient"

Jagdishbhai Patel, Mayur, Himangshu Baishya, Ritesh Kant Gupta, Rabindranath Garai, and Parameswar Krishnan Iyer. "Thin Film Solution Processable Perovskite Solar Cell." In Recent Advances in Multifunctional Perovskite Materials. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.106056.

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Perovskite has emerged as a promising light-harvesting material for solar cells due to its higher absorption coefficient, bandgap tunability, low-exciton binding energy, and long carrier diffusion length. These lead to high power conversion efficiency >25% for thin film-based perovskite solar cells (PSCs). Additionally, PSCs can be fabricated through simple and cost-effective solution processable techniques, which make this technology more advantageous over the current photovoltaic technologies. Several solution-processable methods have been developed for fabrication of PSCs. In this chapte

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Pederiva, F., C. J. Umrigar, and E. Lipparini. "Diffusion Monte Carlo study of circular quantum dots." In Quantum Monte Carlo. Oxford University PressNew York, NY, 2007. http://dx.doi.org/10.1093/oso/9780195310108.003.00131.

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Abstract Several QMC calculations had earlier treated quantum dots of various shapes and sizes by either variational or diffusion methods. This study extended much farther, with ground and low-lying excited states for circular two-dimensional dots with 2 to 13 electrons. The method was fixed-node diffusion QMC with importance sampling. Comparisons were made with Hartree-Fock and density functional calculations at the LSDA level. The system treated was a standard circular quantum dot with N electrons confined in two dimensions by a parabolic potential V = ½kr2 centered at the origin. The masses

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Severson, M. W., and V. Buch. "Quantum Monte Carlo simulation of intermolecular excited vibrational states in the cage water hexamer." In Quantum Monte Carlo. Oxford University PressNew York, NY, 2007. http://dx.doi.org/10.1093/oso/9780195310108.003.00121.

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Abstract The general problem discussed in this paper is that of predicting vibrational excitation in large hydrogen-bonded clusters, and, as the authors point out, “It should be realized that the problem is very difficult.” In this case, the cluster is the cage form of the water hexamer, simplified somewhat by use of rigid-body water molecules. The key to the solution is a new procedure for locating the nodes in the wavefunctions for the excited vibrational states. The method begins with an approximately correct candidate nodal surface, obtained as a zero for a normal coordinate in the harmoni

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Тези доповідей конференцій з теми "Exciton diffusion coefficient"

Riblet, P., AR Cameron, and A. Miller. "Spin-Gratings and In-Well Carrier Transport Measurements in GaAs/AlGaAs Multiple Quantum Wells." In Quantum Optoelectronics. Optica Publishing Group, 1997. http://dx.doi.org/10.1364/qo.1997.qthe.3.

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We have recently demonstrated [1] that transient electron spin gratings created by cross-polarised excitation pulses at a wavelength resonant with the heavy hole exciton, can provide a new and unique way of measuring in-well electron drift mobilities in semiconductor multiple quantum well structures. This compares with the usual transient grating method in which only the ambipolar diffusion coefficient can be determined [2]. A comparison of concentration and spin grating decay rates allows the direct measurement of both the electron and hole drift mobilities in the same sample. In this work we

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Quarles, Gregory J., Andrzej Suchocki, Richard C. Powell, and Shui Lie. "Energy transfer in emerald laser crystals." In OSA Annual Meeting. Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.md8.

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Be3Al2(SiO3)6:Cr3+ (emerald) has important potential applications as a tunable vibronic laser material. The spectra of emerald exhibit structure which can be attributed to Cr3+ ions occupying three nonequivalent crystal field sites. We present here the results of characterizing the optical properties of the Cr3+ ions in emerald using time-resolved site-selection (TRSS) spectroscopy and four-wave mixing (FWM) spectroscopy techniques. The temperature and crossing angle dependence of the FWM signal decay rate are consistent with scattering of the probe beam from a laser-induced population grating

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Smirl, Arthur L., D. S. McCallum, A. N. Cartwright, X. R. Huang, Thomas F. Boggess, and T. C. Hasenberg. "Ultrafast Recovery of Hetero n-i-p-i's by Enhanced In-plane Diffusive Transport." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/up.1992.thc19.

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Hetero n-i-p-i's are one of several semiconductor quantum-well devices that use second-order electro-optic effects and that continue to attract interest for possible applications to low-power two-dimensional switching arrays and all-optical spatial light modulators. The turn-on time for a hetero n-i-p-i device is usually determined by transport perpendicular to the quantum wells. More specifically, it is determined by the time required for carriers generated in the quantum wells to escape the wells and to move to screen the built-in electric field, thus shifting the exciton. Consequently, typi

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Hodgkiss, Justin. "High exciton diffusion coefficients in fused ring electron acceptor films (Conference Presentation)." In Organic, Hybrid, and Perovskite Photovoltaics XX, edited by Kwanghee Lee, Zakya H. Kafafi, Paul A. Lane, and Ana Flávia Nogueira. SPIE, 2019. http://dx.doi.org/10.1117/12.2538441.

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Li, Jinwei, and Yong Shi. "Electron Transport and Recombination in TiO2 Nanofiber Dye Sensitized Solar Cell." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64979.

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Dye sensitized solar cells (DSSCs), a new type of photo-electrochemical solar cells, are a promising alternative to the silicon based photovoltaic because they hold advantages of low cost, simple manufacturing processes and higher conversion efficiency compared with other types of excitonic solar cell. DSSCs with conversion efficiencies of up to 11% have been achieved with a highly stable electrolyte under AM1.5G conditions. Recently, one dimensional (1D) electrospun TiO2 nanofibers have been used as the DSSC photoanode to improve the electron transport efficiency and enhance the light harvest

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Ito, Sho, Tomoyuki Tsunoda, Hiroshi Itakura, Weiguang Bao, Daisuke Kitazawa, and Takeshi Kinoshita. "Experimental Investigation and Numerical Modeling of Hydrodynamic Characteristics of a Heaving Sea Cage." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79085.

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With the increasing world demand for seafood and environmental problems in coastal aquaculture, offshore area has been increasingly expected to be utilized for aquaculture. The offshore aquaculture system has fewer effects on the surrounding marine environment through the rapid diffusion of organic wastes from the cultured fish than the coastal one. The offshore area then provides clean waters for cultured fish. On the other hand, the offshore aquaculture system is subject to the severe natural condition such as typhoon attack. Actually, in the current aquaculture system, the offshore fish cag

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Powell, Richard C., Faqir M. Hashmi, Andrzej Suchocki, F. Durville та G. Boulon. "Laser-induced grating spectroscopy of Cr3+-doρed garnets". У OSA Annual Meeting. Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.wk3.

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Laser-induced grating measurements were made as a function of laser power and write beam crossing angle for various temperatures between 10 and 300 K on Cr3+ ions in Gd3Ga5O12 (GGG), Gd3Sc2Ga3O12 (GSGG), and GGG mixed with Ca, Mg, and Zr ions. Population gratings were produced in the Cr3+ ions, and the diffusion coefficient describing energy migration among the Cr3+ ions was determined from the grating decay rate. The energy migration was found to increase as the temperature was raised for GGG and to decrease with decreasing temperature for GSGG. This difference is attributed to the difference

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Chen, Chao, and Johann Wurzenberger. "Parameterization of an Electrochemical Battery Model Using Impedance Spectroscopy in a Wide Range of Frequency." In WCX SAE World Congress Experience. SAE International, 2024. http://dx.doi.org/10.4271/2024-01-2194.

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<div class="section abstract"><div class="htmlview paragraph">The parameterization of the electrochemical pseudo-two-dimensional (P2D) model plays an important role as it determines the acceptance and application range of subsequent simulation studies. Electrochemical impedance spectroscopy (EIS) is commonly applied to characterize batteries and to obtain the exchange current density and the solid diffusion coefficient of a given electrode material. EIS measurements performed with frequencies ranging from 1 MHz down to 10 mHz typically do not cover clearly isolated solid state diff

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Linkersdörfer, S., J. Benzler, K. Luther, and J. Troe. "Relaxation of Highly Vibrationally Excited Cycloheptatriene in Liquids Studied by Picosecond UV Absorption Spectroscopy." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/up.1994.wc.2.

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To understand in detail the relaxation of highly vibrationally excited polyatomics in dense fluid media experimental answers on fundamental mechanistic aspects are still urgently needed. It has been demonstrated on the relaxation of azulene that too simple applications of isolated binary collision models do not account for the observed relaxation dynamics in liquid solutions [1] and that e.g. cluster type effects may play a role in media like rare gas liquids [2]. However, much more systematic experimental evidence is necessary to establish how far a gas phase type description of energy transf

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Cudney, R. S., G. D. Bacher, R. M. Pierce, and Jack Feinberg. "Origins of the Photorefractive Phase Shift." In Photorefractive Materials, Effects, and Devices II. Optica Publishing Group, 1991. http://dx.doi.org/10.1364/pmed.1991.tua2.

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There is a spatial phase shift between a sinusoidal light intensity pattern and the resulting refractive index grating formed in a photorefractive crystal. For crystals where diffusion is the dominant mechanism for charge migration, this spatial shift is 1/4 of the grating spacing. Any deviation from this value implies some other transport mechanism, such as an applied or internally developed electric field, or the photogalvanic effect, in which optically excited charges preferentially move in one direction in the crystal. Due to its relevance to beam coupling, this spatial shift has been stud

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