Effect of III-nitride polarization on VOC in p–i–n and MQW solar cells

Authors

  • Gon Namkoong,

    Corresponding author
    1. Department of Electrical and Computer Engineering, Old Dominion University, Applied Research Center, 12050 Jefferson Avenue, Newport News, VA 23606, USA
    • Phone: +1 757 269 5349, Fax: +1 757 269 5644
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  • Patrick Boland,

    1. Department of Electrical and Computer Engineering, Old Dominion University, Applied Research Center, 12050 Jefferson Avenue, Newport News, VA 23606, USA
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  • Si-Young Bae,

    1. School of Information and Communications, Gwangju Institute of Science and Technology, 261 Cheomdan-gwagiro (Oryong-dong), Buk-gu, Gwangju 500-712, Korea
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  • Jae-Phil Shim,

    1. School of Information and Communications, Gwangju Institute of Science and Technology, 261 Cheomdan-gwagiro (Oryong-dong), Buk-gu, Gwangju 500-712, Korea
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  • Dong-Seon Lee,

    1. School of Information and Communications, Gwangju Institute of Science and Technology, 261 Cheomdan-gwagiro (Oryong-dong), Buk-gu, Gwangju 500-712, Korea
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    • Phone: +82 62 715 2248, Fax: +82 62 715 2204

  • Seong-Ran Jeon,

    1. Korea Photonics Technology Institute, 971-35, Wolchul-dong, Buk-gu, Gwangju, 500-779, Korea
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  • Kurniawan Foe,

    1. Department of Electrical and Computer Engineering, Old Dominion University, Applied Research Center, 12050 Jefferson Avenue, Newport News, VA 23606, USA
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  • Kevin Latimer,

    1. Department of Electrical and Computer Engineering, Old Dominion University, Applied Research Center, 12050 Jefferson Avenue, Newport News, VA 23606, USA
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  • W. Alan Doolittle

    1. School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
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Abstract

We performed detailed studies of the effect of polarization on III-nitride solar cells. Spontaneous and piezoelectric polarizations were assessed to determine their impacts upon the open circuit voltages (VOC) in p–i(InGaN)–n and multi-quantum well (MQW) solar cells. We found that the spontaneous polarization in Ga-polar p–i–n solar cells strongly modifies energy band structures and corresponding electric fields in a way that degrades VOC compared to non-polar p–i–n structures. In contrast, we found that piezoelectric polarization in Ga-polar MQW structures does not have a large influence on VOC compared to non-polar MQW structures. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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