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United States Patent Application

View the Complete Application at the US Patent & Trademark Office
A highly efficient multi junction photovoltaic device, such as a two, three, or four junction device, is disclosed. The multi-junction device may include a first subcell comprising a first photoactive region and a second subcell comprising a second photoactive region. The first and second photoactive regions are designed to minimize spectral overlap and maximize photocurrent across a broad absorption spectra, such as wavelengths ranging from 400 nm to 900 nm. The device may further include an inter-connecting layer, disposed between the first subcell and the second subcell, that is at least substantially transparent. By introducing a transparent interconnecting layer, a dual element (tandem) cell achieves a power conversion efficiency of 10.0.+-.0.5%. By adding an additional (3.sup.rd) sub-cell that absorbs at the second order optical interference maximum within the stack. The triple junction cell significantly improves the quantum efficiency at shorter wavelengths, achieving a power conversion efficiency of 11.1.+-.0.5%. Adding additional sub-cells has been shown to increase power conversion efficiency above 12%.
Che, Xiaozhou (Ann Arbor, MI), Xiao, Xin (Ann Arbor, MI), Forrest, Stephen R. (Ann Arbor, MI)
15/ 125,690
April 6, 2015
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH [0002] This invention was made with U.S. Government support under Contract Nos. DE-EE0005310 and DE-SC0000957 awarded by the U.S. Department of Energy. The government has certain rights in the invention.