Back contact buffer layer for thin-film solar cells
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United States Patent and Trademark Office
Abstract
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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.
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136/260, 136/252, 136/255, 136/256, 136/264, 438/57, 438/93, 438/94, 438/95