A group of scientists at Empa has pushed the efficiency of flexible solar cells to a new limit. Independent measurements revealed an efficiency of 21.4 percent when these types of solar cells convert light into electricity. For comparison: the best efficiency of a non-flexible solar cell made of crystalline silicon is reported at 26.7 percent.
The details of the research achievement will be presented at the 38th European Photovoltaic Solar Energy and Conference and Exhibition (EU PVSEC) on 7 September 2021 by Romain Carron, group leader in the Laboratory for Thin Films and Photovoltaics headed by Ayodhya N. Tiwari.
High efficiency flexible solar cells are processed on a polymer film by a low temperature co-evaporation method for the growth of the thin film Cu(In,Ga)Se2 semiconductor that absorbs the light. Empa scientist Shiro Nishiwaki optimized the composition of the layer and alkal
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