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Single P-N junction tandem photovoltaic device

United States Patent

October 18, 2011
View the Complete Patent at the US Patent & Trademark Office
Lawrence Berkeley National Laboratory - Visit the Technology Transfer and Intellectual Property Management Department Website
A single P-N junction solar cell is provided having two depletion regions for charge separation while allowing the electrons and holes to recombine such that the voltages associated with both depletion regions of the solar cell will add together. The single p-n junction solar cell includes an alloy of either InGaN or InAlN formed on one side of the P-N junction with Si formed on the other side in order to produce characteristics of a two junction (2J) tandem solar cell through only a single P-N junction. A single P-N junction solar cell having tandem solar cell characteristics will achieve power conversion efficiencies exceeding 30%.
Walukiewicz; Wladyslaw (Kensington, CA), Ager, III; Joel W. (Berkeley, CA), Yu; Kin Man (Lafayette, CA)
RoseStreet Labs Energy, Inc. (Phoenix, AZ)
11/ 777,963
July 13, 2007
STATEMENT OF GOVERNMENTAL INTEREST The invention described and claimed herein was made in part utilizing funds supplied by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The government has certain rights in this invention.