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Développement de Cellules Photovoltaiques à base de CIGS de haute performance sur substrats métalliques

Abstract : The objective of this thesis is the optimization of solar cells based on Cu (In, Ga) Se 2 (CIGS) on high performance metal substrate (> 20%). Metals generally have better mechanical strength than glass which is a brittle material. This allows for example to significantly reduce their thickness and get lighter photovoltaic devices. Moreover, if their thickness is sufficiently reduced, they become conformable or flexible. However, the metal substrates have their own drawbacks. They may contain impurities (eg Fe) that degrade the electronic properties of the absorber material. Furthermore, their thermal expansion coefficient is not always suitable for methods of making high temperature CIGS. Finally CIGS cells on glass substrate have a sodium intake, known element for improving the properties of the CIGS, and brought by the spread of this element from the glass through the molybdenum. The main objective of this thesis is to make solar cells based on CIGS by co-evaporation technique on metal substrates having the closest possible performance of the cells on substrates of soda lime glass (> 20%). The problems that this thesis must meet are the choice of the metal substrate, blocking the diffusion of impurities in the metallic substrates, ensuring strong adhesion to the substrate, reducing residual stresses (to ensure adherence ) and especially the optimization of the Mo adequate layer allowing necessary intake of alkali metal element (Na / K, ...) for a high performance and adaptation CIGS absorber to this type of substrate. Indeed the quality of CIGS will be highly dependent on the deposition temperature of the intake of alkaline element from the substrate and composition gradients In / Ga the back contact to the surface of CIGS. It is known that it is necessary to have a gradient gallium in the CIGS layer in order to obtain cells high. The deposition of CIGS layers by co-evaporation method will be by the "three-stage process." This involves depositing the layer of three well-defined stages. It is important to control this process in order to get a quality absorber for solar cells.
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Submitted on : Wednesday, June 24, 2020 - 2:45:52 PM
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Mishael Stanley. Développement de Cellules Photovoltaiques à base de CIGS de haute performance sur substrats métalliques. Autre. Université Paris sciences et lettres, 2019. Français. ⟨NNT : 2019PSLEC023⟩. ⟨tel-02879968⟩



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