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Propriétés mécaniques des cellules photovoltaïques à base de CIGS sur substrats en verre ultra-fin

Abstract : The goal of this work is to study and to develop CIGS thin-film solar cells on an innovative substrate: the ultra-thin glass. This material has advantageous properties, mainly attributed to its high temperature resistance, its lightweight, its barrier property against moisture, its transparency and its mechanical flexibility. Here we tried to use these properties for the fabrication of lightweight and conformable CIGS solar cells. First, we demonstrate the feasibility of CIGS solar cells on 100 mm-thick ultra-thin glass substrates. We reached 12.1 % efficiency by using a bilayer back contact consisting of a pure Mo layer and a sodium doped Mo layer, which is up to now the record efficiency for CIGS solar cells on ultra-thin glass substrate. Then we show that solar cell performances can deteriorate under cyclic bending fatigue conditions with a radius of curvature of 5 cm. This is partially explained by the formation of cracks in the cells. Then, we report on the mechanical properties of the Mo and the CIGS layers measured by nanoindentation. The hardness and the Young’s modulus of each layer is given and, for the first time, the toughness and the residual stresses of the CIGS. These results are then used to calculate the CIGS internal stresses when the cells are bent. Finaly, we propose a glass-glass structure optimized to lower the CIGS internal stresses under bending.
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Arnaud Gerthoffer. Propriétés mécaniques des cellules photovoltaïques à base de CIGS sur substrats en verre ultra-fin. Mécanique des fluides [physics.class-ph]. Université Grenoble Alpes, 2016. Français. ⟨NNT : 2016GREAI077⟩. ⟨tel-01466987v2⟩

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