Design of a high efficiency CdS/CdTe solar cell with optimized step doping, film thickness, and carrier lifetime of the absorption layerS. Khosroabadi, S. H. Keshmiri and S. MarjaniJ. Eur. Opt. Soc.-Rapid Publ., 9 (2014) 14052DOI: https://doi.org/10.2971/jeos.2014.14052