High-Efficiency GaInP/GaAs Tandem Solar Cells

K. A. Bertness, D. J. Friedman, Sarah R. Kurtz, A. E. Kibbler, C. Kramer, J. M. Olson

Research output: Contribution to journalArticlepeer-review

4 Scopus Citations


GaInP/GaAs tandem solar cells have achieved efficiencies between 25.7-30.2%, depending on illumination conditions. The efficiencies are the highest confirmed two-terminal values measured for any solar cell within each standard illumination category. The monolithic, series-connected design of the tandem cells allows them to be substituted for silicon or gallium arsenide cells in photovoltaic panel systems with minimal design changes. The advantages of using GaInP/GaAs tandem solar cells in space and terrestrial applications are discussed primarily in terms of the reduction in balance-of-system costs that accrues when using a higher efficiency cell. The new efficiency values represent a significant improvement over previous efficiencies for this materials system, and we identify grid design, back interface passivation, and top interface passivation as the three key factors leading to this improvement. In producing the high-efficiency cells, we have addressed nondestructive diagnostics and materials growth reproducibihty as well as peak cell performance.

Original languageAmerican English
Pages (from-to)842-846
Number of pages5
JournalJournal of Propulsion and Power
Issue number5
StatePublished - 1996

NREL Publication Number

  • NREL/JA-451-23046


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