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 Cd1−xZnxS. In this study, the performance of Cd1−xZnxS/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 Cd1−xZnxS compositions were clearly identified to be around x = 0.7, and limitations to the achievable photocurrent and conversion efficiencies have been addressed. Copyright © 2012 John Wiley & Sons, Ltd.
Kartopu, G., Clayton, A.J., Brooks, W.S., Hodgson, S.D., Barrioz, V., Maertens, A., Lamb, D.A. and Irvine, S.J., 2014. Effect of window layer composition in Cd1− xZnxS/CdTe solar cells. Progress in Photovoltaics: Research and Applications, 22(1), pp.18-23.
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Categories: Solar & Photovoltaics