Apparent Bandgap Shift in the Internal Quantum Efficiency for Solar Cells with Back Reflectors

M. A. Steiner, E. E. Perl, J. F. Geisz, D. J. Friedman, N. Jain, D. Levi, G. Horner

Research output: Contribution to journalArticlepeer-review

16 Scopus Citations

Abstract

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.

Original languageAmerican English
Article number164501
Number of pages7
JournalJournal of Applied Physics
Volume121
Issue number16
DOIs
StatePublished - 28 Apr 2017

Bibliographical note

Publisher Copyright:
© 2017 Author(s).

NREL Publication Number

  • NREL/JA-5J00-68087

Keywords

  • band gap
  • III-V semiconductors
  • photoelectric conversion
  • photons
  • solar cell efficiency

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