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Reciprocity between electroluminescence and quantum efficiency used for the characterization of silicon solar cells
Author(s) -
Kirchartz Thomas,
Helbig Anke,
Reetz Wilfried,
Reuter Michael,
Werner Jürgen H.,
Rau Uwe
Publication year - 2009
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.895
Subject(s) - electroluminescence , quantum efficiency , optoelectronics , materials science , reciprocity (cultural anthropology) , diode , light emitting diode , silicon , photovoltaic system , solar cell , optics , physics , nanotechnology , electrical engineering , psychology , social psychology , engineering , layer (electronics)
Spectrally and spatially resolved electroluminescence emission of crystalline silicon solar cells is interpreted in terms of two electro‐optical reciprocity relations. The first relation links the photovoltaic quantum efficiency to the electroluminescence spectrum. Both methods contain information on recombination and the optical pathlength of the incident light, simultaneously. From the electroluminescence spectrum, we derive the pathlength enhancement factor of textured and untextured crystalline silicon solar cells. Further, we use local quantum efficiency measurements to quantitatively explain light induced current as well as panchromatic electroluminescence images. A second reciprocity relation connects open circuit voltage of a solar cell with the light emitting diode quantum efficiency of the same device. For a given quality of light trapping and a given open circuit voltage, we predict the attainable LED quantum efficiency and verify our results experimentally. Copyright © 2009 John Wiley & Sons, Ltd.