CU2ZnSnSe4 Solar Cells onto Polyimide Substrates Fabricated at Low Temperature

Polyimide is an interesting substrate for thin-film photovoltaics as corroborated by recent results obtained with CIGS. However, little work has been done to use this polymer for CZTSSe. This work proves the feasibility of fabricating flexible and efficient CZTSe devices on polyimide. The low thermal robustness and the lack of alkali of this material are tackled in this work. First, the effect of temperature on CZTSe devices fabricated on SLG at low temperature (<; 500°C) is studied. Then, solar cells are fabricated on polyimide using Na and K doping strategies. A 4.9% efficiency device on polyimide is reported.