Apparent bandgap shift in the internal quantum efficiency for solar cells with back reflectors

We demonstrate that in solar cells with highly reflective back mirrors, the measured internal quantum efficiency exhibits a shift in bandgap relative to the measured external quantum efficiency. The shift arises from the fact that the measured reflectance at the front surface includes a superpositio...

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Bibliographic Details
Published in:Journal of applied physics 2017-04, Vol.121 (16)
Main Authors: Steiner, M. A., Perl, E. E., Geisz, J. F., Friedman, D. J., Jain, N., Levi, D., Horner, G.
Format: Article
Language:English
Subjects:
Applied physics
band gap
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Energy gap
III-V semiconductors
photoelectric conversion
Photoelectric effect
Photoelectric emission
photons
Photovoltaic cells
Quantum efficiency
Reflectance
Reflectors
solar cell efficiency
Solar cells
SOLAR ENERGY
Superposition (mathematics)
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Summary:We demonstrate that in solar cells with highly reflective back mirrors, the measured internal quantum efficiency exhibits a shift in bandgap relative to the measured external quantum efficiency. The shift arises from the fact that the measured reflectance at the front surface includes a superposition of waves reflecting from the front and back surfaces. We quantify the magnitude of the apparent shift and discuss the errors that can result in determination of quantities such as the photocurrent. Because of this apparent shift, it is important the bandgap be determined from the external quantum efficiency.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4982234