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Showing 1 to 20 of 26 for “"ZnTe"”.
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Research and development of CdS/CdTe solar cells incorporating ZnTe layers.
… cadmium telluride (CdTe) and zinc telluride (ZnTe).All of these layers were obtained by growing them using electrodeposition in aqueous solutions. In this project, electrodeposition using 2-electrode system was employed to deposit all of the semiconductors. The decision was taken to avoid …
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Synthesis and structural characterization of ZnTe/ZnSe core/shell tunable quantum dots
… Here we present a novel approach to synthesize ZnTe/ZnSe core/shell tunable quantum dots. Characterizations such as transmission electron microscopy, wavelength dispersive X-ray spectroscopy, powder x-ray diffraction are employed to give evidence for the core/shell structure. Absorption, and …
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Properties of Type-II ZnTe/ZnSe Submonolayer Quantum Dots Studied via Excitonic Aharonov-Bohm Effect and Polarized Optical Spectroscopy
… physical and material properties of type-II ZnTe/ZnSe submonolayer quantum dots (QDs), grown via combination of molecular beam epitaxy (MBE) and migration enhanced epitaxy (MEE). I use magneto-photoluminescence, including excitonic Aharonov-Bohm (AB) effect and polarized optical spectroscopy …
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The synthesis, characterisation and bioapplications of Novel Gold-Zinc Telluride Core-shell Nanoparticles
… than conventional chemotherapy. Novel Au-ZnTe nanoparticles was designed to support biocompatibility features that can be utilised for drug delivery and bio-imaging applications. Au, ZnTe and Au-ZnTe nanoparticles were synthesized and analysed for optical, morphological, crystalline and …
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II-VI Core-Shell Nanowires: Synthesis, Characterizations and Photovoltaic Applications
… including ZnO/ZnSe, ZnO/ZnS, and CdSe/ZnTe, have been synthesized and the photovoltaic devices processed from a ZnO/ZnS core-shell nanowire array and a single CdSe/ZnTe core-shell nanowire have been demonstrated.</p> <p>By combining the chemical vapor deposition and pulsed laser …
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Optoelectronic devices based on graded bandgap structures utilising electroplated semiconductors
… materials explored in this research are CdSe, ZnTe, CdS, CdMnTe and CdTe thin films. These layers were characterised for their structural, compositional, morphological, optical, and electrical features using XRD, Raman spectroscopy, EDX, SEM, UV-Vis spectroscopy, PEC cell, C-V, I-V and UPS …
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Novel Quantum Materials for Spintronic and Opto-Electronic Applications
… and polycrystalline structures of Cr-doped ZnTe, CrTe<sub>x</sub>, and etc. to explore for the future candidate quantum materials for spintronic and opto-electronic purposes. Cr-doped ZnTe polycrystalline have depicted transparent conductivity as well as room temperature ferromagnetism for …
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Experimental and Numerical Investigations into Terahertz Time-Domain Spectroscopy
… are the III-V zinc-blende semiconductors GaP and ZnTe which are nonlinear media popular for their advantageous dispersive and absorptive properties in the terahertz range. Therefore, the thesis culminates in the demonstration of a material parameter extraction procedure which we use to obtain the …
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Gasphasenzüchtung massiver Einkristalle im System Cadmium - Zink - Tellur
… den Züchtungsmöglichkeiten im ternären System ZnTe - CdTe für Raumtemperatur Röntgendetekoren. Hierbei liegt der Schwerpunkt auf Modifikationen der Markov Methode. Eingehende Untersuchungen der Pasendiagramme zeigen, dass für das ternäre System Cd1-xZnxTe keine Daten und keine genauen …
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Phononenprozesse und Ladungsträgerdynamik in Halbleitern
… von Cadmiumtellurid (CdTe) und Zinktellurid (ZnTe) in Abhängigkeit der Temperatur untersucht. Der experimentell zugängliche Frequenzbereich zwischen 100 GHz und 3 THz wird von der fundamentalen Transversal Optischen (TO) Phononenresonanz dominiert. Die Analyse der Daten im Rahmen eines …
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A facile hybrid method to synthesize metal and metal chalcogenide nanoparticles using various capping groups
… Furthermore is the synthesis of zinc telluride (ZnTe) and cadmium telluride (CdTe) nanostructured materials also described. The nanomaterials are predominantly capped by organic ligands. The use of water soluble ligands such as triethanolamine (TEA) and cysteine is also reported. The synthetic …
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Polarizing Optical Devices Based on Embedded One-Dimensional Subwavelength-Structured Photonic-Crystal Layers
… range is achieved using a SWS 1-D PCL of ZnTe embedded in a ZnS cube within an external field of view (FOV) of ±6.6o and in the presence of grating filling factor errors of up to ±10%. Comparable results, but with a wider field of view, are also obtained with a Ge PCL embedded in a Si …
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The growth and characterisation of zinc telluride for use as a nuclear radiation detector
As grown ZnTe is a highly conductive p-type semiconductor. In an attempt to produce highly resistive material suitable for fabrication into nuclear radiation detectors various dopants have been added during the Bridgman growth process to try to compenate the shallow acceptor defects that are …
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Research and development of CdTe based thin film PV solar cells
… technique. The material layers include CdS and ZnTe as the window materials, while the absorber material is CdTe. Fabricating a suitable devices for solar energy conversion (i.e. glass/conducting glass/window material/absorber material/metal) structure. Traditional way of fabricating this …
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Internal atomic-scale structure and photothermal dynamics of heterostructured nanomaterials
… (EXAFS) spectrum, we show that the intended ZnTe/CdSe CSQDs, that are synthesized using a common one-pot synthesis procedure, are in actuality nanoparticles with an alloyed core and a patchy CdSe shell. Electronic structure calculations show that the CSQDs essentially behave as one-component …
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Time domain measurement of the nonlinear refractive index in optical fibers and semiconductor film
… n_2 in 2-mm thick samples of GaAs, CdTe and ZnTe semiconductors. In the language of ultrafast spectroscopist, if the best tool to characterize an ultrashort optical pulse is the pulse itself, then the best tool to characterize an optical nonlinear medium is a pulse that has been modified by …
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Liquid metal batteries : ambipolar electrolysis and alkaline earth electroalloying cells
… A ZnlITe ambipolar electrolysis cell comprising ZnTe dissolved in molten ZnCl 2 at 500 0C was first investigated by two- and three-electrode electrochemical analysis techniques. The electrochemical behavior of the melt, thermodynamic properties, and kinetic properties were evaluated. A single …
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Growth and Characterization of Type-II Submonolayer ZnCdTe/ZnCdSe Quantum Dot Superlattices for Efficient Intermediate Band Solar Cells
… material. Upon optimizing growth conditions for ZnTe/ZnSe multilayer quantum dot systems, the growth parameters were modified so as to obtain various ZnCdTe/ZnCdSe samples grown on InP substrates. An extensive characterization has been performed to investigate structural, optical as well as …
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Novel type-II nanocrystal quantum dots and versatile oligomeric phosphine ligands
… quantum dots (CdTe/CdSe(core/shell) and CdSe/ZnTe(core/shell) heterostructures) are synthesized by chemical means. The optical properties of these type-II quantum dots are studied in parallel with their type-I counterparts. The spatial distributions of carriers are controlled within the …
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Heavy-metal-free colloidal nanocrystal heterostructures – synthetic chemistry and growth mechanisms
… color-center (manganese)-doped nanocrystals and ZnTe-based core/shell nanocrystals with spherical shapes. Annealing or growth at high temperatures for an extended period of time is considered detrimental for the synthesis of high-quality Mn-doped II-VI semiconductor nanocrystals, which can lead …
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