Development of CZTS Solar Cells Using Organic Buffer Layer

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Cu2ZnSnS4 (CZTS) is a semiconductor material consisting of abundant and therefore low-cost non-toxic elements. These solar cells were typically fabricated using chemically deposited cadmium sulfide (CdS) buffer layers. However the use of cadmium is undesirable from the viewpoint of environmental safety. In this work, we studied on the effect of a wide variety of organic buffer layer materials on the solar cell performance and present the results for CZTS solar cells with optimized buffer layer. As a result, fullerren-C60 buffer demonstrated the highest CZTS solar cell efficiencies.The p-type CZTS absorber layers were deposited by sol-gel sulfurization onto Mo-coated soda lime glass (SLG). C60 buffer layer were deposited by vacuum deposition. ZnO: Al window layers were deposited by sol-gel solution method. The thicknesses of the C60 layer was varied. The highest power conversion efficiency 0.47 % was obtained the thickness of C60 buffer layer of 5 nm.