Phys. Rev. Lett. 78, 5014–5017 (1997)Increasing the Efficiency of Ideal Solar Cells by Photon Induced Transitions at Intermediate LevelsReceived 7 February 1997; published in the issue dated 30 June 1997 Recent attempts have been made to increase the efficiency of solar cells by introducing an impurity level in the semiconductor band gap. We present an analysis of such a structure under ideal conditions. We prove that its efficiency can exceed not only the Shockley and Queisser efficiency for ideal solar cells but also that for ideal two-terminal tandem cells which use two semiconductors, as well as that predicted for ideal cells with quantum efficiency above one but less than two. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.78.5014
DOI:
10.1103/PhysRevLett.78.5014
PACS:
84.60.Jt, 72.40.+w
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