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Electrodépôt et sélénisation d'alliages Cu-In-Ga en vue de la synthèse de couches minces de Cu(In,Ga)Se2 pour cellules solaires

Abstract : Thin film solar cells based on co-evaporated Cu(In,Ga)Se2 (CIGS) layers reach conversion efficiencies up to 20%. The development of synthesis methods such as electrodeposition should enable to lower the production costs. This work presents a study of Cu-In-Ga alloy electrodeposition in acid aqueous media, on a glass substrate covered with molybdenum. Thermal selenisation between 400 and 600°C leads to CIGS formation. Following a literature study of CIGS synthesis methods (chapter 1), the experimental techniques are described in chapter 2. Chapter 3 deals with the study of electrodeposition conditions for Cu-In-Ga alloys, thanks to solution chemistry analysis and dedicated studies in elementary, binary and ternary electrolytes, using voltammetry. The electrochemical behaviour is correlated with the presence of specific phases, among them Cu2In, CuIn, In and CuGa2 phases, thanks to chemical and structural analysis of the deposits. Composition controlling parameters and oxygen content are highlighted. The structures of the Cu-In-Ga alloys are analysed with X-Ray diffraction. Chapter 4 describes the thermal treatments developed in order to achieve compact absorbers with controlled composition. Raman spectroscopy is used to differentiate the phases, in particular Ga segregation towards the molybdenum layer. Mo/CIGS/CdS/ZnO solar cells are made and photovoltaic conversion efficiencies of 9.8 % are achieved. The best absorber contains copper-poor secondary phases.
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https://pastel.archives-ouvertes.fr/pastel-00649779
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Submitted on : Thursday, December 8, 2011 - 3:58:44 PM
Last modification on : Friday, October 23, 2020 - 4:52:58 PM
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  • HAL Id : pastel-00649779, version 1

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Lydie Ribeaucourt. Electrodépôt et sélénisation d'alliages Cu-In-Ga en vue de la synthèse de couches minces de Cu(In,Ga)Se2 pour cellules solaires. Matériaux. Université Pierre et Marie Curie - Paris VI, 2011. Français. ⟨pastel-00649779⟩

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