[19p-W541-1~14] Efficiency improvement for thin film compound semiconductor solar cells in the present and future

△ [19p-W541-3] Improvement of conversion efficiency of Cu₂Sn_1-xGe_xS₃ (CTGS) solar cells

〇Mitsutaro Umehara¹, Shin Tajima¹, Yasuhiko Takeda¹, Tomoyoshi Motohiro¹ (1.Toyota Central R&D Labs.)

Keywords:CTS,CTGS,solar cell

Cu₂Sn_1-xGe_xS₃ (CTGS) solar cell is one of the most promising candidates for earth-abundant and non-toxic compound thin film solar cells. In this work, we controlled the Ge/Sn ratio to fabricate graded bandgap structure, resulting in improvement of conversion efficiency.