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Back contact buffer layer for thin-film solar cells

United States Patent

September 9, 2014
View the Complete Patent at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
A photovoltaic cell structure is disclosed that includes a buffer/passivation layer at a CdTe/Back contact interface. The buffer/passivation layer is formed from the same material that forms the n-type semiconductor active layer. In one embodiment, the buffer layer and the n-type semiconductor active layer are formed from cadmium sulfide (CdS). A method of forming a photovoltaic cell includes the step of forming the semiconductor active layers and the buffer/passivation layer within the same deposition chamber and using the same material source.
Compaan; Alvin D. (Holland, OH), Plotnikov; Victor V. (Toledo, OH)
The University of Toledo (Toledo, OH)
13/ 515,686
October 19, 2010
STATEMENT REGARDING SPONSORED RESEARCH This invention was made with government support under Grant No. ZXL-5-44205-01 awarded by the U.S. Department of Energy, National Renewable Energy Laboratory. The government has certain rights in this invention.