Relevant bibliographies by topics / Doped Semiconductor Nanocrystals

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Doped Semiconductor Nanocrystals'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 September 2023

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Journal articles on the topic "Doped Semiconductor Nanocrystals"

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Jana, Santanu, Bhupendra B. Srivastava, Somnath Jana, Riya Bose, and Narayan Pradhan. "Multifunctional Doped Semiconductor Nanocrystals." Journal of Physical Chemistry Letters 3, no. 18 (August 29, 2012): 2535–40. http://dx.doi.org/10.1021/jz3010877.

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Sarkar, Suresh, Amit K. Guria, Biplab K. Patra, and Narayan Pradhan. "Synthesis and photo-darkening/photo-brightening of blue emitting doped semiconductor nanocrystals." Nanoscale 6, no. 7 (2014): 3786–90. http://dx.doi.org/10.1039/c3nr06048a.

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Sercel, Peter C., Andrew Shabaev, and Alexander L. Efros. "Symmetry Breaking Induced Activation of Nanocrystal Optical Transitions." MRS Advances 3, no. 14 (2018): 711–16. http://dx.doi.org/10.1557/adv.2018.19.

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ABSTRACTWe have analysed the effect of symmetry breaking on the optical properties of semiconductor nanocrystals due to doping by charged impurities. Using doped CdSe nanocrystals as an example, we show the effects of a Coulomb center on the exciton fine-structure and optical selection rules using symmetry theory and then quantify the effect of symmetry breaking on the exciton fine structure, modelling the charged center using a multipole expansion. The model shows that the presence of a Coulomb center breaks the nanocrystal symmetry and affects its optical properties through mixing and shifting of the hole spin and parity sublevels. This symmetry breaking, particularly for positively charged centers, shortens the radiative lifetime of CdSe nanocrystals even at room temperature, in qualitative agreement with the increase in PL efficiency observed in CdSe nanocrystals doped with positive Ag charge centers [A. Sahu et.al., Nano Lett. 12, 2587, (2012)]. The effect of the charged center on the photoluminescence and the absorption spectra is shown, with and without the presence of compensating charges on the nanocrystal surface. While spectra of individual nanocrystals are expected to shift and broaden with the introduction of a charged center, configuration averaging and inhomogeneous broadening are shown to wash out these effects. The presence of compensating charges at the NC surface also serves to stabilize the band edge transition energies relative to NCs with no charge centers.
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Craievich, A. F., O. L. Alves, and L. C. Barbosa. "Formation and Growth of Semiconductor PbTe Nanocrystals in a Borosilicate Glass Matrix." Journal of Applied Crystallography 30, no. 5 (October 1, 1997): 623–27. http://dx.doi.org/10.1107/s0021889897001799.

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Pb- and Te-doped borosilicate glasses are transformed by appropriate heat treatment into a composite material consisting of a vitreous matrix in which semiconductor PbTe nanocrystals are embedded. This composite exhibits interesting non-linear optical properties in the infrared region, in the range 10–20 000 Å. The shape and size distribution of the nanocrystals and the kinetics of their growth were studied by small-angle X-ray scattering (SAXS) during in situ isothermal treatment at 923 K. The experimental results indicate that nanocrystals are nearly spherical and have an average radius increasing from 16 to 33 Å after 2 h at 923 K, the relative size dispersion being time-invariant and approximately equal to 8%. This investigation demonstrates that the kinetics of nanocrystal growth are governed by the classic mechanism of atomic diffusion. The radius of nanocrystals, deduced by applying the simple Efros & Efros [Sov. Phys. Semicond. (1982), 16, 772–775] model using the energy values corresponding to the exciton peaks of optical absorption spectra, does not agree with the average radius determined by SAXS.
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BANFI, G. P., V. DEGIORGIO, D. FORTUSINI, and H. M. TAN. "BELOW BAND-GAP NONLINEAR OPTICAL PROPERTIES OF SEMICONDUCTOR-DOPED GLASSES." Journal of Nonlinear Optical Physics & Materials 05, no. 02 (April 1996): 205–22. http://dx.doi.org/10.1142/s0218863596000167.

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Through nonlinear transmission and wave-mixing measurements. combined with structural data from neutron scattering, we obtain the below band-gap third-order susceptibility χ(3) (both imaginary and real part) and the refractive-index-change per carrier of semiconductor nanocrystals embedded in a glass matrix. Our data covers a range of crystal radii between 2 and 14 nm, and a range of ratios y=Eg /(ħω), where Eg is the energy gap of the semiconductor and ħω is the energy of the incident photon, between 1.1 and 1.9. The magnitude of χ(3) and its dependence on y are comparable to those of related bulk semiconductors.
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Pradhan, Narayan, and D. D. Sarma. "Advances in Light-Emitting Doped Semiconductor Nanocrystals." Journal of Physical Chemistry Letters 2, no. 21 (October 25, 2011): 2818–26. http://dx.doi.org/10.1021/jz201132s.

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Beaulac, Rémi, Paul I. Archer, and Daniel R. Gamelin. "Luminescence in colloidal Mn2+-doped semiconductor nanocrystals." Journal of Solid State Chemistry 181, no. 7 (July 2008): 1582–89. http://dx.doi.org/10.1016/j.jssc.2008.05.001.

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Vlaskin, Vladimir A., Nils Janssen, Jos van Rijssel, Rémi Beaulac, and Daniel R. Gamelin. "Tunable Dual Emission in Doped Semiconductor Nanocrystals." Nano Letters 10, no. 9 (September 8, 2010): 3670–74. http://dx.doi.org/10.1021/nl102135k.

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Wang, Xianliang, Xin Liu, Dewei Zhu, and Mark T. Swihart. "Controllable conversion of plasmonic Cu2−xS nanoparticles to Au2S by cation exchange and electron beam induced transformation of Cu2−xS–Au2S core/shell nanostructures." Nanoscale 6, no. 15 (2014): 8852–57. http://dx.doi.org/10.1039/c4nr02114b.

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Self-doped Cu2−xS plasmonic semiconductor nanocrystals were converted into monodisperse Cu2−xS–Au2S nanocrystals of tunable composition, including pure Au2S, by cation exchange.
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Ochsenbein, Stefan T., Yong Feng, Kelly M. Whitaker, Ekaterina Badaeva, William K. Liu, Xiaosong Li, and Daniel R. Gamelin. "Charge-controlled magnetism in colloidal doped semiconductor nanocrystals." Nature Nanotechnology 4, no. 10 (August 16, 2009): 681–87. http://dx.doi.org/10.1038/nnano.2009.221.

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Dissertations / Theses on the topic "Doped Semiconductor Nanocrystals"

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Kriegel, Ilka. "Near-infrared plasmonics with vacancy doped semiconductor nanocrystals." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-164558.

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Plasmonics with heavily doped semiconductor nanocrystals (NCs) is an emerging field in NC science. However, impurity doping of NCs remains far from trivial and is, as yet, dominated by a low chemical control over the incorporated dopant atoms. An appealing alternative is vacancy doping, where the formation of vacancies in the structure is responsible for an increased carrier density and elegantly circumvents the issues related to impurity doping. Due to high carrier densities of around 10^21cm^(-3) localized surface plasmon resonances (LSPRs) in the near infrared (NIR) are expected, and as such highlighted to close the gap between conventionally doped NCs and noble metal nanoparticles. Copper chalcogenide NCs, namely copper sulfide (Cu2-xS), copper selenide (Cu2-xSe), and copper telluride (Cu2-xTe), are an attractive example of vacancy doped semiconductor NCs, with spectra dominated by intense NIR resonances. Within this study thorough experimental evidence has been given to prove the plasmonic nature of those NIR resonances. By presenting typical plasmonic characteristics, such as refractive index sensitivity of the LSPR, its intrinsic size dependence, plasmon dynamics, or interparticle plasmon coupling, the LSPRs in copper chalcogenide NCs have unambiguously been identified. The chemical nature of vacancy doping turns out to deliver an additional, highly attractive means of control over the LSPR in vacancy doped copper chalcogenide NCs. Through chemical tailoring of the copper vacancy density via controlled oxidation and reduction, as shown in this study, a reversible tuning of the LSPR over a wide range of frequencies in the NIR (1000-2000 nm) becomes feasible. This highlights copper chalcogenide NCs over conventional plasmonic materials. Notably, the complete suppression of the LSPR uncovers the excitonic features present only in the purely semiconducting, un-doped NCs and reveals the unique option to selectively address excitons and highly tunable LSPRs in one material (bandgap Eg~1.2 eV). As such, copper chalcogenide NCs appear to hold as an attractive material system for the investigation of exciton plasmon interactions. Indeed, a quenching of the excitonic transitions in the presence of the developing LSPR is demonstrated within this work, with a full recovery of the initial excitonic properties upon its suppression. A theoretical study on the shape dependent plasmonic properties of Cu2-xTe NCs reveals a deviation from the usual Drude model and suggests that the carriers in vacancy doped copper chalcogenide NCs cannot be treated as fully free. On the other hand, the Lorentz model of localized oscillators appears to account for the weak shape dependence, as observed experimentally, indicating an essential degree of localization of the carriers in vacancy doped copper chalcogenide NCs. Taken together, this work delivers a huge step toward the complete optical and structural characterization of plasmonic copper chalcogenide NCs. The advantages of semiconductor NC chemistry have been exploited to provide access to novel plasmonic shapes, such as tetrapods that have not been feasible to produce so far. A precise size, shape and phase control presents the basis for this study, and together with a thorough theoretical investigation delivers important aspects to uncover the tunable plasmonic properties of vacancy doped copper chalcogenide NCs.
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Archer, Paul I. "Building on the hot-injection architecture : giving worth to alternative nanocrystal syntheses /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/8520.

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PINCHETTI, VALERIO. "Advanced Spectroscopy of Interface Engineered, Doped and “Electronically” Doped Colloidal Semiconductor Nanocrystals." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2018. http://hdl.handle.net/10281/199097.

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I nanocristalli colloidali a semiconduttore (NC) sono materiali processabili da soluzione che, dalla loro scoperta 30 anni fa, hanno attirato l’attenzione in campo scientifico e tecnologico per le loro proprietà ottiche ed elettriche. Infatti, i NC hanno un ampio range di potenziali applicazioni, che vanno dalle sorgenti luminose, alle celle solari, al bioimaging fino all’informazione quantistica. Ciò è dovuto alla profonda conoscenza e controllo delle loro proprietà elettroniche che si è raggiunto. Infatti, queste ultime si possono modificare controllando la dimensione, la composizione ma anche formando eterostrutture o introducendo impurezze, cioè drogando i NC. A causa dell’ampia varietà di NC che si possono sintetizzare, molti dubbi sui processi fotofisici sottostanti le proprietà ottiche macroscopiche rimangono ancora irrisolti. Dunque, mi sono focalizzato sullo studio di tre sotto-classi di NC: 1) a interfaccia ingegnerizzata; 2) drogati e 3) drogati elettronicamente. Dopo un breve ‘stato dell’arte’ della scienza dei NC colloidali (Capitolo 1), nel secondo Capitolo riporto una studio dettagliato dell’interazione fra i portatori di carica eccitati e l’interfaccia ingegnerizzata dei Dot-in-Bulk core/shell NC, che sono caratterizzati da emissione di fotoluminescenza (PL) sia dagli stati di core che da quelli di shell. Tramite misure di PL ultraveloce, dimostro che la caratteristica struttura all’interfaccia è la motivazione ultima da cui scaturisce la capacità di avere una doppia emissione radiativa, aggiungendo un ulteriore parametro nella chimica dei NC con il quale è possibile modificare le loro proprietà ottiche. Nel Capitolo 3, propongo una nuova strategia di sintesi che permetta di avere NC contenenti tutti un esatto numero di atomi droganti, evitando la distribuzione Poissoniana tipica dei contemporanei metodi di drogaggio. A questo scopo, uso cluster metallici monodispersi come semi di nucleazione per la sintesi dei NC e tramite analisi elementali ed ottiche mostro che effettivamente ogni NC sintetizzato contiene un solo cluster metallico e quindi un numero preciso di impurezze. Il drogaggio può essere considerato ‘isovalente’ nel caso in cui l’impurezza abbia lo stesso stato di ossidazione del semiconduttore, o ‘elettronico’ nel caso questa introduca una carica netta nella matrice ospitante. Il drogante isovalente più noto per i NC II-VI è il Mn2+. La sua configurazione elettronica d5 è caratterizzata da proprietà magnetiche uniche che, in strutture confinate quanticamente porta alla formazione di polaroni. Nel Capitolo 4, mostro come la formazione di polaroni tocca l’energia degli eccitoni tramite misure di PL risonante, ottenendo anche una stima precisa dell’intensità di campo magnetico generata solo dagli ioni Mn2+. Nel Capitolo 5, mostro come la risposta magnetica tipica del Mn2+ si può ottenere anche con l’argento, che è un drogante elettronico in quanto può assumere solo lo stato di ossidazione +1. L’argento però introduce uno stato nel gap energetico del semiconduttore ospitante che partecipa alla ricombinazione radiativa diventando, in modo transiente, un Ag2+ paramagnetico. Tramite misure di dicroismo circolare magnetico, dimostro che NC drogati con impurezze non magnetiche di argento possono assumere comportamenti paramagnetici attivati otticamente. Infine, nel Capitolo 6 ho focalizzato l’attenzione sui NC non tossici di CuInS2. I processi fotofisici alla base del meccanismo di emissione sono ancora dibattuti. A questo scopo, ho eseguito misure di PL risolta in temperatura e di spettroelettrochimica per studiare le dinamiche intrinseche ed estrinseche di questa classe di NC colloidali di ultima generazione.
Semiconductor colloidal nanocrystals (NCs) are solution-processable materials that have focused scientific and technological attention thanks to their tunable optical and electrical properties. Colloidal NCs have indeed wide applicative perspectives that span from light-emitting diodes, to lasers, from solar cells to luminescent solar concentrators, from bioimaging to quantum information. Such a large range of potential NCs technologies is warranted by the unique knowledge and control that has been achieved over the years about their electronic properties. Specifically, the optical and electric properties of these nanomaterials have been tuned by either controlling their size, composition and shape, or producing multicomponent heterostructures and introducing few atoms of a different chemical element, i.e. doping the NCs. Because of the vast gamut of possibilities that colloidal NCs offer, many questions on the elusive charge carrier dynamics underlying the macroscopic observations are still unanswered. In this picture, my work points toward three different sub-classes of NCs: i) interface engineered NCs; ii) doped NCs and iii) ‘electronic’ doped NCs. After a brief review about the ‘state of the art’ of the colloidal NC science (Chap. 1), in Chap. 2 I show a detailed investigation on the interaction between the photoexcited charge carriers and the engineered interface of Dot-in-Bulk core/shell NC, which are featured by radiative recombination from both the core and shell states. I demonstrate that their uncommon dual emission is due to the peculiar interface structure between the compositional domains and that a fine tuning of the optical properties can be also achieved by modifying the interfacial potential profile. In Chap. 3, I propose a novel synthetic approach to overcome the intrinsic Poisson distribution characteristic of the up-to-date NC doping strategies that are based on stochastic distribution of impurity ions in the NC ensemble. To this aim, I use monodispersed metal cluster as seeds for the NC nucleation in the synthesis reaction flask. By mean of combined optical and elemental analysis, I show that the copper clusters composed of exactly four atoms are indeed embedded in the semiconductor matrix, giving monodispersed doped NCs. Semiconductor doping can be further distinguished in ‘isovalent’ doping, in which the impurity has the same oxidation state of the host compound, and ‘electronic’ doping, given by ions which introduce a net charge in the surrounding matrix. The most known ‘isovalent’ dopant for II-VI NCs is Mn2+. Its d5 configuration is featured by unique magnetic properties that, in quantum confined nanomaterials lead to the formation of magnetic polarons. In Chap. 4, I reveal how polaron formation affects the exciton energy by mean of resonant PL measurements, offering a precise estimation of the intensity of the internal magnetic field generated by the Mn2+ spins. In Chap. 5, I report how the magnetic response typical of Mn2+ is reproduced by introducing silver, which is an electronic dopant for II-VI semiconductors, since it can only assume the +1 oxidation state. However, it introduces an electronic level in the forbidden energy gap of the host semiconductor that participates to the radiative recombination and therefore transiently switches to the paramagnetic +2 state. By mean of magnetic circular dichroism experiments I demonstrate that in NCs doped with nonmagnetic silver dopants, the paramagnetic response is completely optically activated. Finally, in Chap. 6 I focused the attention on non toxic, ternary CuInS2 colloidal NCs. The photophysical processes underlying their emission mechanism are, however, still under debate. To address this gap, I carried out temperature-controlled photoluminescence and spectro-electrochemical experiments to unravel the intrinsic and extrinsic charge carrier dynamics of this last-generation class of colloidal N
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Kriegel, Ilka [Verfasser], and Jochen [Akademischer Betreuer] Feldmann. "Near-infrared plasmonics with vacancy doped semiconductor nanocrystals / Ilka Kriegel. Betreuer: Jochen Feldmann." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1046503316/34.

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ROSINA, IRENE. "Exploiting Cation Exchange Reactions in Doped Colloidal NIR Semiconductor Nanocrystals: from synthesis to applications." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1019427.

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Colloidal quantum dots (CQDs) have tunable optical properties through manipulation of their size, shape, and surface chemistry. Among pholuminescent QDs, near-infrared (NIR) emitting ones are of particular interest since they can be used in several applications, from the labeling in living tissues, to the integration in commercial optoelectronic devices, like photovoltaics for solar energy conversion or photodetectors from visible to the near-infrared and mid-infrared. In addition, the exciting promise of CQDs is that is associated with easy and low-cost device fabrication process. In fact, solution-based techniques like spin-coating, dip coating and ink-jet printing are typically used for solution CQDs readily to be used in large-area processing techniques. Thus, to obtain an ink solution of nanocrystals (NCs) ready to be used in device fabrication process, in this thesis, cation exchange (CE) reactions have been used as a convenient tool to finely transform NCs directly in solution or deposited as thin films. These reactions allow to substitute a fraction or all “host” metal cations of pre-synthesized NCs with new “guest” cations while preserving both NCs’ size, shape and, typically, crystal structure. Depending on the miscibility of the reactant and product materials, and on the kinetics of the CE reaction, different types of nanostructures can be accessed ranging from alloy NCs, doped systems, dimers, core@shell (or core@graded-shell) heterostructures even with elaborated architectures (i.e., quantum wells, multiple-cores@shell). Unlike ion substitution in solids, cation exchange at nanoscale results in fast reaction rate and an easy modulation of the thermodynamics through selective ion coordination in solution. This study provides an overview of the CE on semiconductor NCs, in particular on II-VI, I-III-VI2 and III-VI compounds. We first explore the exchange between cadmium chalcogenides and mercury ions to produce Cd1-xHgxTe CQDs which can be potentially employed in NIR photodetectors and photovoltaic devices. Our developed synthesis is a result of a wide systematic investigation process, in which we varied specific physical parameters, such as the reaction temperature, the feed molar ratio of the precursor and the solvent. More specifically, these aspects were studied to have control on the size, shape, surface composition and crystalline phase after mild conditions of annealing into stable connected crystals. This peculiarity could be exploited to boost the photogenerated charges diffusion in polycrystalline photoconducting films fabricated by means of an ink of NCs solution. Additionally, another aspect studied was the surface passivation of Cd1-xHgxTe colloidal NCs, in order to understand how to optimize the charge transfer efficiency among the nanocrystals. The carrier transport in QD devices differs fundamentally from band transport in bulk semiconductors. In nanocrystal film it is of fundamental relevance to improve the mobility of the photogenerated charges. Noteworthy, the granularity of the system and the consequent coupling between adjacent dots can produce additional physical parameters, as charge recombination. The carrier diffusion length can be limited by trapping sites1. To overcome these limitations, post-synthetic strategies that couple the high quality NCs solutions with ideal properties (band gap, absorption, monodispersivity) and high-quality films (quantum dot packing, passivation, and absorptive/conductive properties) are necessary. Indeed, to improve the inter-NCs conductivity in a NC film, ligand exchange and stripping procedures are widely used, with the aim of replacing insulating surfactants with more conductive species. These procedures have some drawbacks, for example metal cations can desorb from the surface of the NCs during the stripping. On the contrary, here we will show how our nano heterostructures (NHCs) enable to avoid the post-process ligand stripping and to perform the final annealing step in milder conditions. Above these considerations, CE can be exploited to address NCs solution through surface uniformity from the nano- to the macroscopic scale. This is the first step toward electronic coupling between the separate building blocks of nanocrystals. Apart from III-V QDs, we shifted our research activity on valid alternative material which do not contain toxic heavy metals such as Cd, Pb, As or Hg, and that offer a high flexibility for tuning band gap in the NIR window. In chapter 5, the results about the study of a III-V system are reported. Thus, we studied InP system, which is probably the only one that could provide a compatible emission color range similar to that of Cd-based QDs but without intrinsic toxicity. Nevertheless, the synthesis of III-V NCs, due to their covalent-bond character, is limited by long reaction times or an uncontrollably fast nucleation that may lead to the formation of amorphous or bulk compounds. The role of our work is to explore the reported InP synthesis and to further improve the luminescent properties of these systems Here we study the effect of different parameter (molar concentration in reaction mixture, the use of different phosphorous precursors) to enhance the control over the particle size and size distribution. After that, we studied different Sulphur source precursors to obtain InP@ZnS core@shell NCs with high quantum Yield (QY). In the last chapter, we describe also I-III-VI2 system as CuInS2 for photoluminescence modulation. In this Chapter Copper Indium Sulfide nanocrystals are prepared using a single-step heating up method relying on the low thermal stability of ter- dodecanethiol used as stabilizing agent, solvent, and sulfur precursors. The obtained particles exhibit an emission varying from 710 to 940 nm. This range depends on the extent of the heating time (pre-heating) before the threshold temperature of 230°C for the growth process of ternary semiconductor NCs such as of CIS nanocrystals. Afterwards we report on the procedure for the growth of a ZnS shell, which enables a blueshift of the PL emission wavelength with respect to those of their parent CIS, due to the widening of the band gap for the entrance of zinc ions into the CIS structures.
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Muckel, Franziska [Verfasser], and Gerd [Akademischer Betreuer] Bacher. "Transition metal doped colloidal semiconductor nanocrystals : from functionality to device development / Franziska Muckel ; Betreuer: Gerd Bacher." Duisburg, 2018. http://d-nb.info/1155722787/34.

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Muckel, Franziska Elisabeth [Verfasser], and Gerd [Akademischer Betreuer] Bacher. "Transition metal doped colloidal semiconductor nanocrystals : from functionality to device development / Franziska Muckel ; Betreuer: Gerd Bacher." Duisburg, 2018. http://d-nb.info/1155722787/34.

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Liu, William K. "Electron spin dynamics in quantum dots, and the roles of charge transfer excited states in diluted magnetic semiconductors /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/8588.

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Kim, Changsu. "Optical, laser spectroscopic, and electrical characterization of transition metal doped ZnSe and ZnS nano- and microcrystals." Birmingham, Ala. : University of Alabama at Birmingham, 2009. https://www.mhsl.uab.edu/dt/2009r/kim.pdf.

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Thesis (Ph. D.)--University of Alabama at Birmingham, 2009.
Title from PDF title page (viewed Feb. 3, 2010). Additional advisors: Renato Camata, Derrick Dean, Chris M. Lawson, Andrei Stanishevsky, Sergey Vyazovkin. Includes bibliographical references (p. 133-140).
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Mikulec, Frederic Victor 1971. "Semiconductor nanocrystal colloids : manganese doped cadmium selenide, (core)shell composites for biological labeling, and highly fluorescent cadmium telluride." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9358.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1999.
Includes bibliographical references.
This thesis describes the characterization and applications of nanometer sized semiconductor (or quantum dot) colloids produced by chemical means. The nanocrystals are synthesized by pyrolysis of organometallic precursors in the coordinating solvent trioctylphosphine oxide (TOPO). The important developments that have contributed to this method are discussed. Manganese doped CdSe nanocrystals are synthesized using a manganese and selenium containing organometallic compound. Chemical etching and electron paramagnetic resonance (EPR) experiments reveal that most of the dopant atoms lie near the surface within the inorganic lattice. Results from fluorescence line narrowing (FLN) and photoluminescence excitation (PLE) spectroscopies show that doped nanocrystals behave as if they were undoped nanocrystals in an external magnetic field. The nanocrystal surface is initially passivated by dative organic ligands. Better passivation and optical properties are achieved by growth of a large band gap semiconductor shell that provides both a physical and an energetic barrier between the exciton and the surface. (CdSe)ZnS (core)shell are prepared with control over both core and shell sizes. The composite nanocrystals are characterized by absorption, emission, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), small angle X-ray scattering (SAXS), and wide angle X-ray scattering (W AXS). The maximum quantum yield is achieved when the core is protected from oxidation by a complete shell; thicker shells show no further increase in quantum yield values, due to defects caused by the large lattice mismatch. Exchange of surface TOPO ligands for mercaptocarboxylic acids produces (core)shell nanocrystals that, when treated with base, are soluble in water and remain fluorescent. Established protocols are used to link these water-soluble nanocrystals to the biomolecules avidin or biotin, producing useful fluorescent labels. Stable phosphine tellurides are prepared using hexapropylphosphorus triamide (HPPT). This precursor is used to prepare CdTe nanocrystals that display room temperature quantum yields up to 70%. The CdTe growth is investigated by absorption and emission spectroscopy. CdTe nanocrystals are characterized by TEM and WAXS.
by Frederic Victor Mikulec.
Ph.D.
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Books on the topic "Doped Semiconductor Nanocrystals"

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Yang, Heesun. Syntheses and applications of Mn-doped II-VI semiconductor nanocrystals. 2003.

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Book chapters on the topic "Doped Semiconductor Nanocrystals"

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Borrelli, N. F. "Photonic Applications of Semiconductor-Doped Glasses." In Semiconductor Nanocrystals, 1–51. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3677-9_1.

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Bryan, J. Daniel, and Daniel R. Gamelin. "Doped Semiconductor Nanocrystals: Synthesis, Characterization, Physical Properties, and Applications." In Progress in Inorganic Chemistry, 47–126. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2005. http://dx.doi.org/10.1002/0471725560.ch2.

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Xiao, Chong. "Magnetic Ions Dope Wide Band-Gap Semiconductor Nanocrystals Realizing Decoupled Optimization of Thermoelectric Properties." In Springer Theses, 79–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49617-6_5.

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C.A. Silva, Anielle, Eliete A. Alvin, Francisco R.A. dos Santos, Samanta L.M. de Matos, Jerusa M. de Oliveira, Alessandra S. Silva, Éder V. Guimarães, et al. "Doped Semiconductor Nanocrystals: Development and Applications." In Nanocrystals [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96753.

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This chapter aims to show significant progress that our group has been developing and the applications of several doped semiconductor nanocrystals (NCs), as nanopowders or embedded in glass systems. Depending on the type of dopant incorporated in the nanocrystals, the physical, chemical, and biological properties can be intensified. However, it can also generate undesired toxic effects that can potentially compromise its use. Here we present the potential of zinc oxide NCs doped with silver (Ag), gold (Au), and magnesium (Mg) ions to control bacterial diseases in agriculture. We have also performed biocompatibility analysis of the pure and Ag-doped sodium titanate (Na2Ti3O7) NCs in Drosophila. The doped nanocrystals embedded in glassy systems are chrome (Cr) or copper (Cu) in ZnTe and Bi2Te3 NCs for spintronic development nanodevices. Therefore, we will show several advantages that doped nanocrystals may present in the technological and biotechnological areas.
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"Magnetic Ion–Doped Semiconductor Nanocrystals." In Handbook of Nanophysics, 185–202. CRC Press, 2016. http://dx.doi.org/10.1201/9781420075458-13.

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Chelikowsky, James R. "Algorithms for Predicting the Physical Properties of Nanocrystals and Large Clusters." In Computational Nanoscience, 1–25. The Royal Society of Chemistry, 2011. http://dx.doi.org/10.1039/bk9781849731331-00001.

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The electronic structure problem for nanoscale systems is a computationally challenging problem. The large number of degrees of freedom, both electronic and nuclear, and requiring a highly precise solution, make the problem impossible to solve without some effective approximations. Here I illustrate some advances in algorithm developments by solving the electronic structure problem within density functional theory in real space using pseudopotentials and density functional theory. The algorithms presented are based on a Chebyshev-filtered subspace iteration, which results in a significant speedup over methods based on standard sparse iterative diagonalization. I illustrate this method for a variety of nanostructures by calculating the electronic and vibrational states for silicon nanocrystals, the electronic properties of doped semiconductor nanocrystals, and the magnetic properties of metallic iron clusters.
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K. M., Sandhya, Litty Thomas Manamel, and Bikas C. Das. "Doping of Semiconductors at Nanoscale with Microwave Heating (Overview)." In Microwave Heating - Electromagnetic Fields Causing Thermal and Non-Thermal Effects. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95558.

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Incorporation of dopants efficiently in semiconductors at the nanoscale is an open challenge and is also essential to tune the conductivity. Typically, heating is a necessary step during nanomaterials’ solution growth either as pristine or doped products. Usually, conventional heating induces the diffusion of dopant atoms into host nanocrystals towards the surface at the time of doped sample growth. However, the dielectric heating by microwave irradiation minimizes this dopant diffusion problem and accelerates precursors’ reaction, which certainly improves the doping yield and reduces processing costs. The microwave radiation provides rapid and homogeneous volumetric heating due to its high penetration depth, which is crucial for the uniform distribution of dopants inside nanometer-scale semiconducting materials. This chapter discusses the effective uses of microwave heating for high-quality nanomaterials synthesis in a solution where doping is necessary to tune the electronic and optoelectronic properties for various applications.
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Silva, Anielle, Mariana Alves Pereira Zóia, Lucas Ian Veloso Correia, Fernanda Van Petten Vasconcelos Azevedo, Aline Teodoro de Paula, Larissa Prado Maia, Layara Santana de Carvalho, et al. "Biocompatibility of Doped Semiconductors Nanocrystals and Nanocomposites." In Cytotoxicity. InTech, 2018. http://dx.doi.org/10.5772/intechopen.77197.

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Singh, Jyoti, Niteen P. Borane, and Rajamouli Boddula. "Milestone Developments and New Perspectives of Nano/Nanocrystal Light Emitting Diodes." In Light-Emitting Diodes - New Perspectives [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108907.

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Light emitting diode (LED) is a one type of p/n junction semiconductor device which is used in less energy consumption for numerous lighting functions. Because of their high performance and long existence, their eye-catching application is getting increasing numbers in recent times. LEDs are nowadays defined as using the “ultimate light bulb”. In a previous couple of years, its efficiency has been multiplied through converting it to nano size. This new light-emitting has a nano-pixel structure and it affords high-resolution performance and the geometry of the pixel is cylindrical or conical form. Due to the fact that the previous few years, a few impurity-doped nanocrystal LEDs are varying a good deal in trend. Its performance is very excessive and consumes a smaller amount of voltage. Its monochromatic behavior and indicator excellent are shown publicly demanded in the market and in this work, it’s covered evaluations of the fundamental’s standards of LEDs and the specific mixed metallic and nanocrystal shape of emitters. In addition, it covers the upcoming challenges that the current trend is working to resolve to get efficient materials to fulfill the future energy crisis.
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Conference papers on the topic "Doped Semiconductor Nanocrystals"

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Nataraj, Latha, Aaron Jackson, Lily Giri, Clifford Hubbard, and Mark Bundy. "Doped group-IV semiconductor nanocrystals." In 2013 IEEE International Nanoelectronics Conference (INEC). IEEE, 2013. http://dx.doi.org/10.1109/inec.2013.6466028.

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Zou, Shou-Jyun, and Shun-Jen Cheng. "Magnetism of magnetic ion doped semiconductor nanocrystals." In SPIE NanoScience + Engineering, edited by Henri-Jean Drouhin, Jean-Eric Wegrowe, and Manijeh Razeghi. SPIE, 2013. http://dx.doi.org/10.1117/12.2023623.

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Kawazoe, Tadashi, Tetsuya Yamamoto, Lev G. Zimin, and Yasuaki Masumoto. "Persistent spectral hole-burning in CuBr nanocrystals." In Spectral Hole-Burning and Related Spectroscopies: Science and Applications. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/shbs.1994.wd51.

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Persistent hole-burning phenomena in ion-doped glass and organic-molecule-doped organic glass have been well known. In recent years semiconductor nanocrystals have been studied extensively because of their novel optical properties such as large optical nonlinearities, and their possibility for applications, such as lasers, ultrafast optical devices, and so on. However, so far "persistent spectral hole-burning (PSHB)" phenomenon in semiconductor nanocrystals has never been reported until the PSHB phenomenon was observed in CdSe and CuCl nanocrystals in our laboratory. Therefore, we may be able to find the other semiconductor nanocrystals which show persistent hole-burning phenomenon. In this publication, we report the persistent hole-burning phenomenon in CuBr semiconductor nanocrystals embedded in glass. Our experiment shows the spectral hole in CuBr nanocrystals remains for more than 8 hours without any detectable relaxation.
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Mei, Guang, Scott Carpenter, L. E. Felton, and P. D. Persans. "Size dependence of quantum Stark effect in CdSxSe1-x nanocrystals." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.wt5.

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We report experimental electromodulation results on various sized CdS x Se1- x nanocrystals doped in a glass matrix. The samples were made by heat treatment and annealing of as-received filter glass from Schott. The size of the nanocrystals can be controlled from 40 to 200Å in diameter by annealing time. Transmission electron microscopy and absorption measurements were performed to get the size and volume fraction of semiconductor nanocrystals in the sample. Raman experiments indicated that the samples are CdS0.44Se0.56 and that the composition does not change with nanocrystal size. Electromodulation experiments were performed, and two strong peaks from the quantum-confined excitons were observed.
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Delerue, Christophe. "Theory of Localized Surface Plasmon Resonance in Doped Semiconductor Nanocrystals." In nanoGe Fall Meeting 2018. València: Fundació Scito, 2018. http://dx.doi.org/10.29363/nanoge.fallmeeting.2018.191.

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Martucci, Alessandro, Massimo Guglielmi, Jochen Fick, and Mike L. Post. "SOL-GEL FILMS DOPED WITH SEMICONDUCTOR NANOCRYSTALS FOR OPTICAL APPLICATIONS." In International Symposium on Optical Science and Technology, edited by Edward J. A. Pope, Helmut K. Schmidt, Bruce S. Dunn, and Shuichi Shibata. SPIE, 2002. http://dx.doi.org/10.1117/12.453859.

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Delerue, Christophe. "Theory of Localized Surface Plasmon Resonance in Doped Semiconductor Nanocrystals." In nanoGe Fall Meeting 2018. València: Fundació Scito, 2018. http://dx.doi.org/10.29363/nanoge.nfm.2018.191.

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Feldmann, Sascha, Mahesh Gangishetty, Ivona Bravić, Timo Neumann, Bo Peng, Thomas Winkler, Richard H. Friend, Bartomeu Monserrat, Daniel N. Congreve, and Felix Deschler. "Exciton localization in doped perovskite nanocrystals enhances intrinsic radiative recombination." In Physical Chemistry of Semiconductor Materials and Interfaces XX, edited by Daniel Congreve, Christian Nielsen, Andrew J. Musser, and Derya Baran. SPIE, 2021. http://dx.doi.org/10.1117/12.2594757.

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Thantu, Napoleon, Robert S. Schley, and Brian L. Justus. "Second Harmonic Generation in Glass Doped with I-VII Semiconductor Nanocrystals." In Nonlinear Optics: Materials, Fundamentals and Applications. Washington, D.C.: OSA, 2002. http://dx.doi.org/10.1364/nlo.2002.tub5.

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Sosnowski, T., P. B. Klein, T. B. Norris, R. N. Bhargava, and D. Gallagher. "Femtosecond Blue Continuum Generation and its Application to the Time-Resolved Study of Mn2+ Emission in Mn-Doped ZnS Nanocrystals." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/up.1994.wc.4.

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Recently, the achievement of high quantum efficiency light emission from semiconductor nanocrystals using transition metal doping was reported1 in the ZnS:Mn system. While this system is of considerable interest both scientifically (physics of low dimensional structures) and technologically (fast, high speed phosphors), the excitation dynamics in doped nanocrystals are still not well understood. In order to probe such a system on the picosecond or sub-picosecond time scale, a tunable ultrafast UV source is required. We have developed such a source by using the frequency-doubled output of a 250kHz Ti:sapphire regenerative amplifier2 to produce the blue continuum.
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