期刊
PROGRESS IN PHOTOVOLTAICS
卷 21, 期 3, 页码 344-350出版社
WILEY
DOI: 10.1002/pip.1215
关键词
EQE; quantum efficiency; multi-junction; luminescence coupling; photon coupling; optical coupling; GaAs; GaInP; Ge; photoluminescence; electroluminescence; measurement artifact; small signal analysis
资金
- Science Foundation Arizona [SRG 0190-07, SRG 0339-08]
- Air Force Research Laboratories/Space Vehicles Directorate [FA9453-08-2-0228]
- NSF [1002114]
The effects of luminescence coupling on the external quantum efficiency (EQE) measurement of an InGaP/InGaAs/Ge triple junction solar cell were investigated. A small signal model was used to study the interaction of the subcells during EQE measurement. It was found that an opticalelectrical feedback mechanism results in EQE measurement artifacts. Measurements of luminescence from the InGaP pn junction are also performed to quantitatively determine the strength of the luminescence coupling. These results offer a more thorough and comprehensive interpretation of EQE measurement results that are needed for the design and accurate performance evaluation of high-efficiency multijunction solar cells. The effects demonstrated here can also be used to measure the spontaneous emission efficiency of the subcells, which is useful for nondestructive assessment of multijunction solar cell material quality. Copyright (c) 2011 John Wiley & Sons, Ltd.
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