InGaP/GaAs/Ge triple-junction solar cells with ZnO nanowires

Authors

  • Jei-Li Hou,

    1. Institute of Microelectronics and Department of Electrical Engineering, Advanced Optoelectronic Technology Center, Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan, Taiwan
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  • Shoou-Jinn Chang,

    1. Institute of Microelectronics and Department of Electrical Engineering, Advanced Optoelectronic Technology Center, Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan, Taiwan
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  • Ting-Jen Hsueh,

    Corresponding author
    1. National Nano Device Laboratories, Tainan, Taiwan
    • Correspondence: Ting-Jen Hsueh, National Nano Device Laboratories, Tainan-based Science Park, Tainan 741, Taiwan.

      E-mail: tj.Hsueh@gmail.com

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  • Chih-Hung Wu,

    1. Institute of Nuclear Energy Research, Atomic Energy Council, Kaohsiung, Taiwan
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  • Wen-Yin Weng,

    1. Institute of Microelectronics and Department of Electrical Engineering, Advanced Optoelectronic Technology Center, Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan, Taiwan
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  • Jia-Min Shieh

    1. National Nano Device Laboratories, Tainan, Taiwan
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ABSTRACT

ZnO nanowire (NW) grown on triple-junction (TJ) solar cells via the hydrothermal growth method to enhance efficiency is investigated. In this paper, experimental results indicate that TJ solar cells with ZnO NW as an antireflection (AR) coating have the lowest reflectance in the short wavelength spectrum, as compared with those of bare TJ solar cells (without AR coating) and solar cells with SiNx and TiO2/Al2O3 AR coatings. ZnO NW has the lowest light reflection among all experimental samples, especially in the range of ultraviolet to green light (300–500 nm). It was found that ZnO NW could enhance the conversion efficiency by 6.92%, as compared with the conventional TJ solar cell. In contrast, SiNx and TiO2/Al2O3 AR coatings could only enhance the conversion efficiency by 3.72% and 6.46% increase, respectively. The encapsulated results also suggested that the cell with ZnO NW coating could provide the best solar cell performances. Furthermore, all samples are measured at tilt angles of 0°–90° and results show that the solar cells with ZnO NW have the highest efficiency at all tilt angles. Furthermore, a small NW diameter increases light absorption. Copyright © 2012 John Wiley & Sons, Ltd.

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