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Temperature‐dependent electroluminescence and voltages of multi‐junction solar cells
Author(s) -
Karcher Christian,
Helmers Henning,
Schachtner Michael,
Dimroth Frank,
Bett Andreas W.
Publication year - 2014
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.2431
Subject(s) - electroluminescence , voltage , open circuit voltage , optoelectronics , solar cell , materials science , band gap , electrical engineering , nanotechnology , engineering , layer (electronics)
The spectral electroluminescence of a monolithic triple‐junction solar cell reveals the sub‐cell open‐circuit voltages under variation of temperature and carrier concentration. We present an electroluminescence set‐up that is able to acquire a full spectrum in less than 10 s and give insight into the voltage‐extraction process. The sum of the sub‐cell voltages is in excellent agreement to open‐circuit voltages acquired under concentrated illumination. The temperature‐induced voltage losses are investigated and explained by a bandgap dependent increase in intrinsic carrier concentration. Finally, the accurate extraction of the sub‐cell bandgaps helps to identify a temperature rise with increasing current density. Copyright © 2013 John Wiley & Sons, Ltd.