E. Lund, Jeffrey L. Johnson, W. M. Hlaing Oo, M. Scarpulla
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Investigating sputtered Cu2Si1−xSnxS3 [CSTS] for earth abundant thin film photovoltaics
This study investigates the synthesis of chalcopyrite Cu2Si1−xSnxS3 (CSTS) thin films for photovoltaic solar cell absorber layers. Preliminary results indicate that layered sputtering of Cu, Sn, and Si followed by annealing in a sulfur atmosphere at 500°C does not provide adequate mixing or sulfur incorporation. Annealing/sulfurizing a homogeneous co-sputtered film of Cu, Sn, and S lead to CSTS formation, although low sulfur incorporation and undesired copper sulfide phase formation resolved. Sputtering from sulfide targets may lead to formation of CSTS.
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