Triple-junction solar cell efficiencies above 32%: The promise and challenges of their application in high-concentration-ratio PV systems

H. L. Cotal, D. R. Lillington, J. H. Ermer, Richard King, N. H. Karam, S. R. Kurtz, D. J. Friedman, J. M. Olson, J. S. Ward, A. Duda, K. A. Emery, T. Moriarty

Research output: Chapter in Book/Report/Conference proceedingConference contribution

52 Scopus citations

Abstract

Results from Spectrolab-grown Ga0.5In0.5P/GaAs/Ge structures optimized for the AM1.5D spectrum are described along with progress toward developing next-generation multijunction solar cells for high concentration ratios (X). The epitaxially-grown layers were processed into triple junction cells both at Spectrolab and NREL, and I-V tested vs. X. Cells were tested with efficiencies as high as 32.4% near 372 suns. The FF limited the performance with increasing X as a result of the increased role of the series resistance. The Voc vs. X showed its log-linear dependence on Isc over 1000 suns. Based on recent cell improvements for space applications, multijunction cells appear to be ideal candidates for high efficiency, cost effective, PV concentrator systems. Future development of new 1-eV materials for space cells, and further reduction in Ge wafer costs, promises to achieve cells with efficiencies <40% that cost $0.3/W or less at concentration levels between 300 to 500 suns.

Original languageEnglish (US)
Title of host publicationConference Record of the IEEE Photovoltaic Specialists Conference
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages955-960
Number of pages6
Volume2000-January
ISBN (Print)0780357728
DOIs
StatePublished - 2000
Externally publishedYes
Event28th IEEE Photovoltaic Specialists Conference, PVSC 2000 - Anchorage, United States
Duration: Sep 15 2000Sep 22 2000

Other

Other28th IEEE Photovoltaic Specialists Conference, PVSC 2000
CountryUnited States
CityAnchorage
Period9/15/009/22/00

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering

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    Cotal, H. L., Lillington, D. R., Ermer, J. H., King, R., Karam, N. H., Kurtz, S. R., Friedman, D. J., Olson, J. M., Ward, J. S., Duda, A., Emery, K. A., & Moriarty, T. (2000). Triple-junction solar cell efficiencies above 32%: The promise and challenges of their application in high-concentration-ratio PV systems. In Conference Record of the IEEE Photovoltaic Specialists Conference (Vol. 2000-January, pp. 955-960). [916044] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PVSC.2000.916044