Challenges in large-area, thin-film CIGS modules

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Abstract
Recent effort at Solarex has been directed toward moving the conversion efficiency of CIGS based modules closer to that demonstrated for small area cells of the same material. Analysis of module structures indicates that much of the gap between device and module performance is due to the difficulty in achieving complete current collection in the large area segments used in modules. Optimization of module design for current collection at the operating point is strongly influenced by the interconnect quality. The development of robust, low resistivity interconnects with minimal area loss is crucial to achievement of high module efficiencies. In this work we report on the influence of module material and interconnect parameters on module conversion efficiency, and the recent progress resulting in a substantial reduction in interconnect resistivity and width.

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