Metamorphic GaAsP Buffers for Growth of Wide-Bandgap InGaP Solar Cells

J. Simon, S. Tomasulo, P. J. Simmonds, M. Romero, M. L. Lee

Research output: Contribution to journalArticlepeer-review

30 Scopus Citations

Abstract

GaAsxP1-x graded buffers were grown via solid source molecular beam epitaxy (MBE) to enable the fabrication of wide-bandgap InyGa1-yP solar cells. Tensile-strained GaAsxP1-x buffers grown on GaAs using unoptimized conditions exhibited asymmetric strain relaxation along with formation of faceted trenches, 100-300 nm deep, running parallel to the [01̄1] direction. We engineered a 6 μm thick grading structure to minimize the faceted trench density and achieve symmetric strain relaxation while maintaining a threading dislocation density of ≤106 cm -2. In comparison, compressively-strained graded GaAs xP1-x buffers on GaP showed nearly-complete strain relaxation of the top layers and no evidence of trenches but possessed threading dislocation densities that were one order of magnitude higher. We subsequently grew and fabricated wide-bandgap InyGa1-yP solar cells on our GaAsxP1-x buffers. Transmission electron microscopy measurements gave no indication of CuPt ordering. We obtained open circuit voltage as high as 1.42 V for In0.39Ga0.61P with a bandgap of 2.0 eV. Our results indicate MBE-grown InyGa1-yP is a promising material for the top junction of a future multijunction solar cell.

Original languageAmerican English
Article numberArticle No. 013708
Number of pages6
JournalJournal of Applied Physics
Volume109
Issue number1
DOIs
StatePublished - 1 Jan 2011
Externally publishedYes

NREL Publication Number

  • NREL/JA-5200-50885

Keywords

  • cell efficiency
  • device performance
  • solar cells

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