能源化学(英文版) ›› 2019, Vol. 38 ›› Issue (11): 147-152.DOI: 10.1016/j.jechem.2018.12.010

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Selenium cooperated polysulfide electrolyte for efficiency enhancement of quantum dot-sensitized solar cells

Mengsi Zhoua,b, Gencai Shena, Zhenxiao Panb, Xinhua Zhonga,b   

  1. a Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;
    b College of Materials and Energy, South China Agricultural University, Guangzhou 510642, Guangdong, China
  • 收稿日期:2018-09-28 修回日期:2018-12-13 出版日期:2019-11-15 发布日期:2020-12-18
  • 通讯作者: Zhenxiao Pan, zxpan@scau.edu.cn; Xinhua Zhong, zhongxh@scau.edu.cn
  • 基金资助:
    This work was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2017R1D1A1A09000642) and by a grant from the R&D Program of the Korea Railroad Research Institute (KRRI), Republic of Korea.

Selenium cooperated polysulfide electrolyte for efficiency enhancement of quantum dot-sensitized solar cells

Mengsi Zhoua,b, Gencai Shena, Zhenxiao Panb, Xinhua Zhonga,b   

  1. a Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;
    b College of Materials and Energy, South China Agricultural University, Guangzhou 510642, Guangdong, China
  • Received:2018-09-28 Revised:2018-12-13 Online:2019-11-15 Published:2020-12-18
  • Contact: Zhenxiao Pan, zxpan@scau.edu.cn; Xinhua Zhong, zhongxh@scau.edu.cn
  • Supported by:
    This work was supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education (NRF-2017R1D1A1A09000642) and by a grant from the R&D Program of the Korea Railroad Research Institute (KRRI), Republic of Korea.

摘要: The modification of polysulfide electrolyte with additives has been demonstrated as an effective way to improve the photovoltaic performance of quantum dot-sensitized solar cells (QDSCs). Most of these additives can inhibit the charge recombination processes at photoanode/electrolyte interface and favor the improvement of Voc of cell devices. Herein, we showed that the incorporation of elemental selenium (Se) in polysulfide electrolyte to form polyselenosulfide species can notably improve the performance of QDSCs. Unlike previous reports, we present here an integrated investigation of the effects of polyselenosulfide species in polysulfide electrolyte on the photovoltaic performance of QDSCs from both of the photoanode and counter electrode (CE) aspects. Electrochemical impedance spectroscopy (IS) and opencircuit voltage-decay (OCVD) measurements demonstrated that the introduction of Se into polysulfide electrolyte can not only retard charge recombination at photoanode/electrolyte interface, but also reduce the charge transfer resistance at CE/electrolyte interface, resulting in the improvement of Jsc and FF values. Consequently, the average efficiency of Zn-Cu-In-Se QDSCs was improved from 9.26% to 9.78% under AM 1.5 G full one sun illumination.

关键词: Quantum dot-sensitized solar cells, Polysulfide electrolyte, Selenium, Charge transfer, Counter electrode

Abstract: The modification of polysulfide electrolyte with additives has been demonstrated as an effective way to improve the photovoltaic performance of quantum dot-sensitized solar cells (QDSCs). Most of these additives can inhibit the charge recombination processes at photoanode/electrolyte interface and favor the improvement of Voc of cell devices. Herein, we showed that the incorporation of elemental selenium (Se) in polysulfide electrolyte to form polyselenosulfide species can notably improve the performance of QDSCs. Unlike previous reports, we present here an integrated investigation of the effects of polyselenosulfide species in polysulfide electrolyte on the photovoltaic performance of QDSCs from both of the photoanode and counter electrode (CE) aspects. Electrochemical impedance spectroscopy (IS) and opencircuit voltage-decay (OCVD) measurements demonstrated that the introduction of Se into polysulfide electrolyte can not only retard charge recombination at photoanode/electrolyte interface, but also reduce the charge transfer resistance at CE/electrolyte interface, resulting in the improvement of Jsc and FF values. Consequently, the average efficiency of Zn-Cu-In-Se QDSCs was improved from 9.26% to 9.78% under AM 1.5 G full one sun illumination.

Key words: Quantum dot-sensitized solar cells, Polysulfide electrolyte, Selenium, Charge transfer, Counter electrode