SPLTRAK Abstract Submission
Optimization of CdTe Solar Cells using Co-sputtered CdSeTe  
Deng-Bing Li, Sandip Singh Bista, Neupane Sabin, Xiaomeng Duan, Manoj K Jamarkattel, Abdul Quader, Adam Philips, Michael Heben, Randall J Ellingson, Yanfa Yan
Department of Physics and Astronomy, and Wright Center for Photovoltaics Innovation and Commercialization (PVIC), University of Toledo, Toledo, OH, United States

Co-deposited CdSeTe has been demonstrated to be an efficient way to improve the short-circuited current density (JSC) in CdSeTe solar cells. In this work, co-sputtered CdSeTe film with different compositions is investigated. The effect of CdSeTe layer thickness and the CdCl2 treatment temperatures are systematically investigated to improve the JSC and the power conversion efficiency. We found that insufficient diffusion of Se will result in poor carrier collection efficiencies at blue wavelength and interior front junction, yielding low VOC and JSC. When Se is over diffused at the front interface, the carrier collection efficiencies at a long wavelength will be reduced. Finally, an impressive JSC of 28.3 mA/cm2 was demonstrated. The optimization of copper activation is currently undertaken, and higher device performance is promised.