Study on influences of CdZnS buffer layer on CdTe solar cells

This paper deals with the Cd1-xZnxS/CdTe solar cell, with the structure parameters confirmed by basic theories, reports and experiments. The influences of x composition and the buffer layer width on the open circuit voltage, the short circuit current, the fill factor, and the conversion efficiency are discussed by numerical simulation. It is shown that the optimized buffer layer should be Cd0.4Zn0.6S, and the width is 30 nm based on the simulation. The Cd1-xZnxS introduction indeed increases the blue portion absorption of solar spectrum and the efficiency of CdTe solar cells is thus improved.