960-mV Open-Circuit Voltage Chalcopyrite Solar Cell

Open-circuit voltage (V
_oc
) of 960 mV on chalcopyrite solar cell was achieved by pure-sulfide Cu(In,Ga)S
₂
solar cell. Generally, high-performance Cu(In,Ga)S
₂
needs KCN-etching treatment to remove CuS layer; however, we were able to fabricate it without KCN-etching treatment. Our champion puresulfide Cu(In,Ga)S
₂
cell demonstrated the efficiency of 14.0%. In this paper, the latest results for high-performance pure-sulfide Cu(In,Ga)S
₂
cells will be presented.