[15p-PB1-1~24] 13.10 Compound solar cells

[15p-PB1-17] Influence of a white light bias on the performance of Cu₂Sn_1-xGe_xS₃ (CTGS) solar cells

〇Mitsutaro Umehara¹, Yasuhiko Takeda¹, Shin Tajima¹, Tomoyoshi Motohiro¹, Takenobu Sakai², Ryosuke Maekawa² (1.Toyota CRDL, 2.Toyota Motor Corp.)

Keywords:solar cell,CTS,CZTS

Cu₂Sn_1-xGe_xS₃ (CTGS) (x=0.17) is a promising material for bottom cells due to its high absorption coefficient and the optimal bandgap (about 1.0 eV). However, the performance of the CTGS solar cells decreases without blue light irradiation, which is a critical drawback for bottom cells. We found that this drawback can be overcome by optimizing the deposition condition of the buffer layer.