Effect of window layer composition in Cd_(1-x)Zn_xS/CdTe solar cells

摘要

To improve CdS/CdTe cell/module efficiencies, CdS window layer thinning is commonly applied despite the risk of increased pin-hole defects and shunting. An alternative approach is to widen the band gap of the window layer (2.42 eV for CdS) via alloying, for example, by forming compositions of Cd_(1-x)Zn_xS. In this study, the performance of Cd_(1-x)Zn_xS/CdTe thin-film solar cells has been studied as a function of x (from x=0 to 0.9), widening the window layer band gap up to and over 3.4 eV. Optimum Cd_(1-x)Zn_xS compositions were clearly identified to be around x=0.7, and limitations to the achievable photocurrent and conversion efficiencies have been addressed.