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Properties of Thermally Evaporated Titanium Dioxide as an Electron-Selective Contact for Silicon Solar Cells

Author

Listed:
  • Changhyun Lee

    (Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea)

  • Soohyun Bae

    (Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea)

  • HyunJung Park

    (Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea)

  • Dongjin Choi

    (Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea)

  • Hoyoung Song

    (Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea)

  • Hyunju Lee

    (Semiconductor Laboratory, Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468-8511, Japan)

  • Yoshio Ohshita

    (Semiconductor Laboratory, Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya 468-8511, Japan)

  • Donghwan Kim

    (Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea
    KU-KIST Green School, Graduate School of Energy and Environment, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea)

  • Yoonmook Kang

    (KU-KIST Green School, Graduate School of Energy and Environment, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea)

  • Hae-Seok Lee

    (KU-KIST Green School, Graduate School of Energy and Environment, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea)

Abstract

Recently, titanium oxide has been widely investigated as a carrier-selective contact material for silicon solar cells. Herein, titanium oxide films were fabricated via simple deposition methods involving thermal evaporation and oxidation. This study focuses on characterizing an electron-selective passivated contact layer with this oxidized method. Subsequently, the SiO 2 /TiO 2 stack was examined using high-resolution transmission electron microscopy. The phase and chemical composition of the titanium oxide films were analyzed using X-ray diffraction and X-ray photoelectron spectroscopy, respectively. The passivation quality of each layer was confirmed by measuring the carrier lifetime using quasi-steady-state photoconductance, providing an implied open circuit voltage of 644 mV. UV–vis spectroscopy and UV photoelectron spectroscopy analyses demonstrated the band alignment and carrier selectivity of the TiO 2 layers. Band offsets of ~0.33 and ~2.6 eV relative to the conduction and valence bands, respectively, were confirmed for titanium oxide and the silicon interface.

Suggested Citation

  • Changhyun Lee & Soohyun Bae & HyunJung Park & Dongjin Choi & Hoyoung Song & Hyunju Lee & Yoshio Ohshita & Donghwan Kim & Yoonmook Kang & Hae-Seok Lee, 2020. "Properties of Thermally Evaporated Titanium Dioxide as an Electron-Selective Contact for Silicon Solar Cells," Energies, MDPI, vol. 13(3), pages 1-10, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:3:p:678-:d:316647
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    References listed on IDEAS

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    1. James Bullock & Mark Hettick & Jonas Geissbühler & Alison J. Ong & Thomas Allen & Carolin M. Sutter-Fella & Teresa Chen & Hiroki Ota & Ethan W. Schaler & Stefaan De Wolf & Christophe Ballif & Andrés C, 2016. "Efficient silicon solar cells with dopant-free asymmetric heterocontacts," Nature Energy, Nature, vol. 1(3), pages 1-7, March.
    2. Kunta Yoshikawa & Hayato Kawasaki & Wataru Yoshida & Toru Irie & Katsunori Konishi & Kunihiro Nakano & Toshihiko Uto & Daisuke Adachi & Masanori Kanematsu & Hisashi Uzu & Kenji Yamamoto, 2017. "Silicon heterojunction solar cell with interdigitated back contacts for a photoconversion efficiency over 26%," Nature Energy, Nature, vol. 2(5), pages 1-8, May.
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    Cited by:

    1. Yu-Tsu Lee & Fang-Ru Lin & Zingway Pei, 2020. "Solution-Processed Titanium Oxide for Rear Contact Improvement in Heterojunction Solar Cells," Energies, MDPI, vol. 13(18), pages 1-9, September.
    2. Hoyoung Song & Changhyun Lee & Jiyeon Hyun & Sang-Won Lee & Dongjin Choi & Dowon Pyun & Jiyeon Nam & Seok-Hyun Jeong & Jiryang Kim & Soohyun Bae & Hyunju Lee & Yoonmook Kang & Donghwan Kim & Hae-Seok , 2021. "Monolithic Perovskite-Carrier Selective Contact Silicon Tandem Solar Cells Using Molybdenum Oxide as a Hole Selective Layer," Energies, MDPI, vol. 14(11), pages 1-9, May.

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