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In this paper, we report on two-dimensional (2D) numerical simulations of photoresponse for HgCdTe infrared photodiode. Effects of conduction band non-parabolic and band gap narrowing (BGN) have been investigated in detail. By taking into account the contributions: (i) the Burstein-Moss (BM) shift with a non-parabolic conduction band, (ii) the BGN effect, and (iii) the Hg-vacancy-induced acceptor...
Highly luminescent semiconductor nanocrystals with graded band gap were synthesized using hot injection method. The band gap of nanocrystals were controlled by gradual incorporation of sulfur to CdSe nanocrystals by applying severely asymmetric composition of reactants ([Cd]/[Se,S]≫1). The maximum emission wavelength of the grown nanocrystals was varied by controlling the concentration ratio of VI...
Thin films of CdZnS have found extensive applications in various optical, electrical and optoelectronic devices. In the present work CdZnS (Cadmium Zinc Sulphide) thin films have been deposited by a simple, inexpensive and rapid synthesis route, microwave-assisted chemical bath deposition (MW-CBD). The bath solution is composed of Cadmium Sulphate, Zinc Sulphate, thiourea, ammonium Sulphate and ammonia...
Nanoscale depth-resolved and cross sectional cathodoluminescence spectroscopy (DRCLS) provides correlations of local electronic and chemical structure with actual solar cell performance in sets of copper indium gallium diselenide (CIGS)/CdS/ZnO/ITO thin film solar cells. Local cross sectional and depth-dependent results throughout the various layers within the solar cells reveal local spatial variations...
II-VI wide band gap semiconductors and their properties are of great interest for various optoelectronic and solid-state lighting applications. We have synthesized a series of high quality mono-dispersed Cd1-xZnxS (0lestimesles1.0) quantum dots by co-precipitation method at 6degC temperature. X-ray diffraction (XRD), Small angle X-ray scattering (SAXS) and UV-Visible spectrophotometer was used to...
In this work, we firstly present the elaboration of CdSe nanocrystals (NCs) dispersed in a KBr crystalline matrix in order to build nanostructured composed materials showing monocrystalline structure, and also using another technique, to deposit thin film of amorphous silica (SiO2) containing CdSe quantum dots. These elaborated guest-host systems were investigated for potential applications in optoelectronic...
Cu(In,Ga)Se/sub 2//CdS/ZnO cells with efficiencies close to 19% have been obtained with films prepared by coevaporation of the elements. Electrodeposition has the potential to become a suitable method for large production of CIGS solar modules. In this paper, we present the results of an on going collaboration project, between CNRS-ENSCP, EDF (Electricite de France) and SUR (Saint Gobain Recheche)...
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