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Charge Transfer in Mixed-Phase TiO 2 Photoelectrodes for Perovskite Solar Cells

Author

Listed:
  • Anna Nikolskaia

    (Solar Photovoltaic Laboratory, Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia)

  • Marina Vildanova

    (Solar Photovoltaic Laboratory, Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia)

  • Sergey Kozlov

    (Solar Photovoltaic Laboratory, Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia)

  • Nikolai Tsvetkov

    (Solar Photovoltaic Laboratory, Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia
    Department of Energy Environmental Water and Sustainability, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea)

  • Liudmila Larina

    (Solar Photovoltaic Laboratory, Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia
    Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Korea)

  • Oleg Shevaleevskiy

    (Solar Photovoltaic Laboratory, Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 119334 Moscow, Russia)

Abstract

In mesoscopic perovskite solar cells (PSCs) the recombination processes within the TiO 2 photoelectrode and at the TiO 2 /perovskite interface limit power conversion efficiency. To overcome this challenge, we investigated the effect of TiO 2 phase composition on the electronic structure of TiO 2 photoelectrodes, as well as on PSCs performance. For this, a set of PSCs based on TiO 2 thin films with different content of anatase and rutile particles was fabricated under ambient conditions. X-ray diffraction, optical spectroscopy and scanning electron microscopy were used to study the structural, morphological and optical characteristics of TiO 2 powders and TiO 2 -based thin films. X-ray photoelectron spectroscopy (XPS) analysis of anatase revealed a cliff conduction band alignment of 0.2 eV with respect to the rutile. Energy band alignment at the anatase/rutile/perovskite interfaces deduced from the XPS data provides the possibility for interparticle electron transport from the rutile to anatase phase and the efficient blocking of electron recombination at the TiO 2 /perovskite interface, leading to efficient electron-hole separation in PSCs based on mixed-phase TiO 2 photoelectrodes. PSCs based on TiO 2 layers with 60/40 anatase/rutile ratio were characterized by optimized charge extraction and low level of recombination at the perovskite/TiO 2 interface and showed the best energy conversion efficiency of 13.4% among the studied PSCs. Obtained results provide a simple and effective approach towards the development of the next generation high efficiency PSCs.

Suggested Citation

  • Anna Nikolskaia & Marina Vildanova & Sergey Kozlov & Nikolai Tsvetkov & Liudmila Larina & Oleg Shevaleevskiy, 2020. "Charge Transfer in Mixed-Phase TiO 2 Photoelectrodes for Perovskite Solar Cells," Sustainability, MDPI, vol. 12(3), pages 1-14, January.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:3:p:788-:d:311557
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    References listed on IDEAS

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