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Extremely thin absorber "eta" solar cells with nanostructured II-VI absorber Materials and Properties

Abstract : The development of semiconducting materials for the extremely thin absorber (eta) solar cell using cheap and scalable methods was the main objective of this work. The eta-solar cell is composed of all inorganic materials consisting of an extremely thin layer of absorbing material sandwiched between nanostructured transparent electron and hole conductors (Eg ≥ 3.3 eV). Compact and defect free ZnO thin film and nanowires (NWs) were prepared galvanostatically. The ZnO nanowire dimensions were controlled with the ZnO seed layer or the applied current density. The photosensitization of the ZnO nanowires with conformal layers of CdS, CdSe and CdTe prepared by Successive Ionic Layer Adsorption and Reaction (SILAR) was studied. The improvement of the absorber structural and optical properties by annealing and chemical treatment was achieved. The Close Spaced Sublimation (CSS) and Quantum Dot (QD) sensitization were also used for CdTe thin shell deposition, while the first method produced low coverage, the second resulted in better coverage but with not optimal optical features. The ZnO NW/absorber heterostructure was completed with a hole conducting CuSCN layer. The influence of the CuSCN layer (prepared by three methods) morphology on the eta-solar cell performance is discussed. Electrodeposited and SILAR prepared films exhibited rougher surfaces than that by the Impregnation technique (which affects the electrical conductivity). The ZnO/absorber core/shell heterostructures were also tested in a photoelectrochemical cell. The recorded efficiencies (up to 2 %) for the case of CdS and CdSe photosensitizers demonstrated an improvement of the ZnO/absorber interfaces and the material quality achieved by the modified-SILAR technique. These results let us to consider that today a Renascence of the SILAR method is happening.
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https://theses.hal.science/tel-00815056
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Submitted on : Thursday, April 18, 2013 - 2:59:36 PM
Last modification on : Friday, March 25, 2022 - 11:09:55 AM
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  • HAL Id : tel-00815056, version 1

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Raul Salazar. Extremely thin absorber "eta" solar cells with nanostructured II-VI absorber Materials and Properties. Material chemistry. Institut National Polytechnique de Grenoble - INPG, 2012. English. ⟨NNT : ⟩. ⟨tel-00815056⟩

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