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(a) Illustration of traditional STPV and (b) nonreciprocal STPV. The absorber of traditional STPV has back radiation toward the sun. In nonreciprocal STPV, the back emission from the intermediate layer is suppressed and more incoming energy is directed toward the cell. The nonreciprocal behavior of the intermediate layer can be made wavelength selective. Source: University of Houston / Physical Review Applied.
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