High efficient and stable ultra-thin CdTe solar cell with a potential Copper Telluride BSF

CdTe is recognized as leading solar cell for having the feature of low cost, high efficiency and better cell stability. The BSF strategy below the absorber layer of CdTe solar cell showed the possibility of higher power conversion efficiency. In this research work, Copper Telluride (Cu
₂
Te) BSF is used to explore the hidden potentiality of CdTe solar cell at ultra-thin level. It was investigated that the addition of Cu
₂
Te BSF significantly enhanced the cell conversion efficiency to 22.51% (Jsc = 24.26 mA/cm
²
, FF = 0.875, Voc = 1.06 V) with only 0.8 μm of absorber layer in CdTe solar cell. In addition, the cell stability was improved by adding Cu
₂
Te BSF layer in CdTe solar cell and the temperature co-efficient (TC) was 0.16%/°C which indicated better thermal stability.