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Schematic representations (not to scale) of the alternative module with 3D view (a, b) and cross section (c). The top image shows the different layers: the metallic front contact (in black), the window ZnO/ZnO:Al (AZO) bilayer (in purple and blue), the CdS buffer layer (in yellow), the CIGSe absorber material (in red) and the Mo-back contact (in green). In addition, Figure 1b shows the patterned molybdenum layer. Figure 1c presents interconnection layout between two adjacent cells, the electrons flow is illustrated by white arrows.
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