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Concept and demonstration of an intermediate band tandem device for solar energy conversion
Author(s) -
Sippel Philipp,
Heitz Simon,
Elagin Mikaela,
Semtsiv Mykhaylo P.,
Eichberger Rainer,
Masselink W. Ted,
Hannappel Thomas,
Schwarzburg Klaus
Publication year - 2016
Publication title -
progress in photovoltaics: research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.286
H-Index - 131
eISSN - 1099-159X
pISSN - 1062-7995
DOI - 10.1002/pip.2697
Subject(s) - tandem , photovoltaic system , solar cell , optoelectronics , solar energy , theory of solar cells , range (aeronautics) , energy conversion efficiency , materials science , optics , solar cell efficiency , engineering physics , physics , electrical engineering , engineering , composite material
We have realized a tandem solar cell design that combines a pin‐junction with a photovoltaic intersubband absorber. This concept allows harvesting light in the visible range and the near‐ and mid‐infrared at the same time, and theoretically, energy conversion efficiencies beyond the Shockley–Queisser‐limit could be achieved. A test structure was grown, and the operation of this concept could be confirmed, in principal with an optical two‐beam experiment. The basic characteristics of the device can be explained with an equivalent circuit design that consists of three individual cells, and we find an obvious analogy to the concept of the intermediate band solar cell with noteworthy advantages at some points. Our results show, that for a working device it is crucial to adjust the properties of the photovoltaic intersubband absorber for optimal charge separating performance at the working point of the solar cell. Copyright © 2015 John Wiley & Sons, Ltd.