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Architectures radiales à base de nanofils de ZnO pour des applications photovoltaïques

Abstract : Solar energy has a huge potential for the futur electricity generation. The research in this area is therefore accelerating these last years; Especially, the development of non-toxic semiconductor materials, which can be elaborated by a low-cost and easy-to-use techniques such as growths in liquid chemistry. In this context, zinc oxide (ZnO) has become increasingly important in research laboratories.This thesis has been carried out for several purposes. The first was to improve our understanding of the mechanisms involved in the growth of ZnO nanowires by chemical bath deposition, and, in particular, the role of chemical precursors introduced into the bath. Subsequently, morphological studies and crystallization annealing studies of TiO2 and Sb2S3 shells deposited on ZnO nanowires by ALD, SILAR and spray pyrolysis are found to be essential for the preparation of heterostructures based on ZnO nanowires/TiO2/SB2S3 for solar cells. In this kind of cell, the ZnO is the electron conductor, whereas the TiO2 passivates the surface of the ZnO nanowires and protects them. The Sb2S3 absorbs the photons of the solar spectrum and produces excitons for the creation of current.These heterostructures are elaborated for the first time and have never been reported in the literature. A photoconversion efficiency of 2.3% was determined in this manuscript. This value is encouraging for the next studies on these materials and represents the first effective efficiency for this kind of promising heterostructures.
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Submitted on : Friday, January 19, 2018 - 11:19:07 AM
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Romain Parize. Architectures radiales à base de nanofils de ZnO pour des applications photovoltaïques. Micro et nanotechnologies/Microélectronique. Université Grenoble Alpes, 2017. Français. ⟨NNT : 2017GREAI017⟩. ⟨tel-01688239⟩

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