22 March 2013 Impact of P2 scribe geometry on monolithic series interconnected CIGS modules
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The CIGS (Copper Indium Gallium Selenide) solar panel industry is cautiously moving to adopt laser processes for the P2 and the P3 scribe steps that form the electrical interconnection between cells within a module [1]. In this work we study variants of these two laser processes and evaluate their relative performance. P2 scribes are applied with geometries that range from continuous scribes to discrete spots and we examine the relationship between scribe geometry and P2 contact resistance. Transmission line theory [2] is used to calculate P2 contact resistance as is common in the industry. The results are compared with two simple geometric models that predict relative contact resistance for different scribe geometries. We also apply different types of scribes for both P2 and P3 in the production of minimodules and evaluate the results. We find that not only is the optimal geometry for the P2 scribe a continuous line, high overlap of the laser spots yields an improvement in contact resistance not predicted by geometry alone. Finally we find that removing only the TCO (transparent conductive oxide) layer for the P3 scribe results in modules with good efficiency, however a P3 scribe that removes the TCO and CIGS layer yields better modules with about 1% higher absolute efficiency.
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M. Rekow, M. Rekow, D. Bartl, D. Bartl, C. Sandfort, C. Sandfort, A. Letsch, A. Letsch, "Impact of P2 scribe geometry on monolithic series interconnected CIGS modules", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 86012J (22 March 2013); doi: 10.1117/12.2003388; https://doi.org/10.1117/12.2003388

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