Soft chemical processes such as screen printing, sol-gel, electrochemical or chemical bath-deposition, enable low cost and easily scalable processes for thin layer solar cells. For the CIGSe based solar cells, with the standard Mo/Cu(In,Ga)Se2/CdS/i-ZnO/n+-ZnO structure, all layers of the p-n heterojunction and the transparent conductive oxide window can be grown by aqueous solution processes. In this work we focus on the electrochemical investigation of In-S layers. XPS analyses show the presence of both S and O. Conversion efficiencies of complete devices up to 14 % are obtained.
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