Resolving spectral overlap issue of intermediate band solar cells using non-uniform sub-bandgap state filling

Albert Lin*, Jamie Phillips

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Intermediate band solar cell provides novel alternative to multi-junction solar cell, but its efficiency is significantly degraded when spectral overlap exists between different absorption bands. Here, a scheme using non-uniform sub-bandgap state filling together with intermediate band transport is proposed to resolve the spectral overlap issue. On the basis of detailed balance calculation, spectrally decoupled devices using low-high state filling is shown to achieve 52.8% conversion efficiency when 4 eV spectral overlap is present between absorption coefficients of different bands, compared with baseline efficiency equal to 35.1% for conventional half-filled intermediate band devices. If a base material without intermediate band is added to the two section low-high state filling devices, the efficiency is further increased to 61.5%, which approaches efficiency of 63.2% for intermediate band devices with no spectral overlap and 63.8% for unconstrained triple-junction tandem cells. The junction thermalization loss associated with proposed new structures is shown to be equal to conventional half-filled intermediate band devices.

Original languageEnglish
Pages (from-to)1062-1069
Number of pages8
JournalProgress in Photovoltaics: Research and Applications
Volume22
Issue number10
DOIs
StatePublished - 1 Jan 2014

Keywords

  • Intermediate state/band
  • Solar cell
  • Spectral overlap
  • Sub-bandgap photovoltaics

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