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GaAs nanopillar-array solar cells employing in situ surface passivation

Author

Listed:
  • Giacomo Mariani

    (University of California at Los Angeles)

  • Adam C. Scofield

    (University of California at Los Angeles)

  • Chung-Hong Hung

    (University of California at Los Angeles)

  • Diana L. Huffaker

    (University of California at Los Angeles
    California NanoSystems Institute, University of California at Los Angeles)

Abstract

Arrays of III–V direct-bandgap semiconductor nanopillars represent promising photovoltaic candidates due to their inherent high optical absorption coefficients and minimized reflection arising from light trapping, efficient charge collection in the radial direction and the ability to synthesize them on low-cost platforms. However, the increased surface area results in surface states that hamper the power conversion efficiency. Here, we report the first demonstration of GaAs nanopillar-array photovoltaics employing epitaxial passivation with air mass 1.5 global power conversion efficiencies of 6.63%. High-bandgap epitaxial InGaP shells are grown in situ and cap the radial p–n junctions to alleviate surface-state effects. Under light, the photovoltaic devices exhibit open-circuit voltages of 0.44 V, short-circuit current densities of 24.3 mA cm−2 and fill factors of 62% with high external quantum efficiencies >70% across the spectral regime of interest. A novel titanium/indium tin oxide annealed alloy is exploited as transparent ohmic anode.

Suggested Citation

  • Giacomo Mariani & Adam C. Scofield & Chung-Hong Hung & Diana L. Huffaker, 2013. "GaAs nanopillar-array solar cells employing in situ surface passivation," Nature Communications, Nature, vol. 4(1), pages 1-8, June.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2509
    DOI: 10.1038/ncomms2509
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    Cited by:

    1. Sung Bum Kang & Rahul Sharma & Minhyeok Jo & Su In Kim & Jeongwoo Hwang & Sang Hyuk Won & Jae Cheol Shin & Kyoung Jin Choi, 2022. "Catalysis-Free Growth of III-V Core-Shell Nanowires on p -Si for Efficient Heterojunction Solar Cells with Optimized Window Layer," Energies, MDPI, vol. 15(5), pages 1-10, February.

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