Progress Toward an Advanced Four-Subcell Inverted Metamorphic Multi-Junction (IMM) Solar Cell

Daniel Friedman, Jeffrey Carapella, Carl Osterwald, Scott Ahrenkiel, Manuel Romero, Mark Wanlass

Research output: Contribution to journalArticlepeer-review

7 Scopus Citations


We report progress on the development of an advanced four-subcell IMM CPV solar cell that is designed for extremely high conversion efficiency under realistic concentrator operating conditions. Practical considerations allowing the design to mitigate problems related to Al-containing alloys, lattice mismatch, non-ideal short-wavelength response, and reflection losses are described. Performance modeling is used to guide the choice of optimal subcell band gaps for the new IMM cell. Early experimental efforts to develop and implement the new design are described and discussed.

Original languageAmerican English
Pages (from-to)139-149
Number of pages11
JournalProgress in Photovoltaics: Research and Applications
Issue number2
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© Copyright 2015 John Wiley & Sons, Ltd.

NREL Publication Number

  • NREL/JA-5J00-60173


  • high efficiency
  • III-V
  • multijunction solar cells


Dive into the research topics of 'Progress Toward an Advanced Four-Subcell Inverted Metamorphic Multi-Junction (IMM) Solar Cell'. Together they form a unique fingerprint.

Cite this