Performance Optimization of the CdSexTe1-x/CdTe Solar Cell

The effect of CST (CdSexTe1-x) Se (x) composition and thickness on the performance of CST/CdTe solar cells heat treated at different CdCh temperatures has been studied. The superstrate cell structure was: ITO/MZO/CST/CdTe/Back Contact. CdTe and CST bi-layer absorbers were deposited by the CSS (close spaced sublimation) process. The CST Se composition and thickness varied from 10-40% and 0.25-1.0 µm respectively. With the increase of Se composition, Voc decreased and -JSC, fill factor increased due to the decrease in the band gap. A CST thickness of 0.50 µm resulted in the highest V oc and fill factor. The best performance was obtained for 27% Se with 0.50 µm CST. Performing the Cdcl 2 heat treatment at 430°C resulted in the highest minority carrier lifetime and improved performance.