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Multiband semiconductor compositions for photovoltaic devices

United States Patent

May 4, 2010
View the Complete Patent at the US Patent & Trademark Office
Lawrence Berkeley National Laboratory - Visit the Technology Transfer and Intellectual Property Management Department Website
Highly Efficient Multigap Solar Cell Materials
The highly mismatched alloy Zn.sub.1-yMn.sub.yO.sub.xTe.sub.1-x, 0.ltoreq.y<1 and 0<x<1 and other Group II-IV-Oxygen implanted alloys have been synthesized using the combination of oxygen ion implantation and pulsed laser melting. Incorporation of small quantities of isovalent oxygen leads to the formation of a narrow, oxygen-derived band of extended states located within the band gap of the Zn.sub.1-yMn.sub.yTe host. With multiple band gaps that fall within the solar energy spectrum, Zn.sub.1-yMn.sub.yO.sub.xTe.sub.1-x is a material perfectly satisfying the conditions for single-junction photovoltaics with the potential for power conversion efficiencies surpassing 50%.
Walukiewicz; Wladyslaw (Kensington, CA), Yu; Kin Man (Lafayette, CA), Wu; Junqiao (Belmont, MA)
The Regents of the University of California (Oakland, CA)
10/ 999,456
November 29, 2004
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The invention described and claimed herein was made in part utilizing funds supplied by the United States Department of Energy under contract No. DE-AC03-76SF000-98 between the U.S. Department of Energy and The Regents of the University of California. The government has certain rights to the invention.