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Bifacial structure for tandem solar cells

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
National Renewable Energy Laboratory - Visit the NREL Technology Transfer Website
The present invention provides a bifacial solar cell with two thin-film polycrystalline or amorphous cells formed on opposing sides of a transparent substrate so that high temperature deposition of all absorber layers can be completed before deposition of any window layers at lower temperatures, which would diffuse into the absorber layers at high temperatures, to avoid degradation or destruction of p/n junctions by such diffusion. The bifacial solar cell may be manufactured by either sequential or simultaneous deposition of absorber layers and by either sequential or simultaneous deposition of window layers of each cell.
Young, David L. (Golden, CO), Noufi, Romel (Golden, CO)
10/ 895,474
November 22, 2004
[0001] The United States Government has rights in this invention under Contract No. DE-AC36-99G010337 between the United States Department of Energy and the National Renewable Energy Laboratory, a Division of the Midwest Research Institute.