Controlled Interfacial Electron Dynamics in Highly Efficient Zn2SnO4-Based Dye-Sensitized Solar Cells

Authors

  • Seong Sik Shin,

    1. WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea)
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    • These authors contributed equally to this work.

  • Dr. Dong Wook Kim,

    1. Department of Chemistry, Northwestern University, 245 Sheridan Road, Evanston, IL 60208 (USA)
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    • These authors contributed equally to this work.

  • Daesub Hwang,

    1. Department of Chemistry, Yonsei University, Seoul, 120-749 (Korea)
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  • Jae Ho Suk,

    1. WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea)
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  • Lee Seul Oh,

    1. Photo-electronic Hybrid Research Center Korea Institute of Science and Technology (KIST), Seoul 136-791 (Korea), Green School, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 136-701 (Korea)
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  • Byung Suh Han,

    1. WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea)
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  • Dong Hoe Kim,

    1. WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea)
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  • Ju Seong Kim,

    1. WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea)
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  • Prof. Dongho Kim,

    Corresponding author
    1. Department of Chemistry, Yonsei University, Seoul, 120-749 (Korea)
    • Dongho Kim, Department of Chemistry, Yonsei University, Seoul, 120-749 (Korea)

      Jin Young Kim, Photo-electronic Hybrid Research Center Korea Institute of Science and Technology (KIST), Seoul 136-791 (Korea), Green School, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 136-701 (Korea)

      Kug Sun Hong, WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea)

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  • Dr. Jin Young Kim,

    Corresponding author
    1. Photo-electronic Hybrid Research Center Korea Institute of Science and Technology (KIST), Seoul 136-791 (Korea), Green School, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 136-701 (Korea)
    • Dongho Kim, Department of Chemistry, Yonsei University, Seoul, 120-749 (Korea)

      Jin Young Kim, Photo-electronic Hybrid Research Center Korea Institute of Science and Technology (KIST), Seoul 136-791 (Korea), Green School, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 136-701 (Korea)

      Kug Sun Hong, WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea)

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  • Prof. Kug Sun Hong

    Corresponding author
    1. WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea)
    • Dongho Kim, Department of Chemistry, Yonsei University, Seoul, 120-749 (Korea)

      Jin Young Kim, Photo-electronic Hybrid Research Center Korea Institute of Science and Technology (KIST), Seoul 136-791 (Korea), Green School, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 136-701 (Korea)

      Kug Sun Hong, WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744 (Korea)

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Abstract

Among ternary oxides, Zn2SnO4 (ZSO) is considered for dye-sensitized solar cells (DSSCs) because of its wide bandgap, high optical transmittance, and high electrical conductivity. However, ZSO-based DSSCs have a poor performance record owing largely to the absence of systematic efforts to enhance their performance. Herein, general strategies are proposed to improve the performance of ZSO-based DSSCs involving interfacial engineering/modification of the photoanode. A conformal ZSO thin film (blocking layer) deposited at the fluorine-doped tin oxide–electrolyte interface by pulsed laser deposition suppressed the back-electron transfer effectively while maintaining a high optical transmittance, which resulted in a 22 % improvement in the short-circuit photocurrent density. Surface modification of ZSO nanoparticles (NPs) resulted in an ultrathin ZnO shell layer, a 9 % improvement in the open-circuit voltage, and a 4 % improvement in the fill factor because of the reduced electron recombination at the ZSO NPs–electrolyte interface. The ZSO-based DSSCs exhibited a faster charge injection and electron transport than their TiO2-based counterparts, and their superior properties were not inhibited by the ZnO shell layer, which indicates their feasibility for highly efficient DSSCs. Each interfacial engineering strategy could be applied to the ZSO-based DSSC independently to lead to an improved conversion efficiency of 6 %, a very high conversion efficiency for a non-TiO2 based DSSC.

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