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Special Issue: Solar Cells

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Recent Advances in Spiro[fluorene-9,9′-xanthene]-Based Hole Transport Materials for Perovskite Solar Cells

Mingli Suna, Changjin Oub, Baoyi Ren*,c, Linghai Xieb, Xianghua Zhao*,d, and Wei Huangb,e   

  1. a College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, 26 Hexing Road, Harbin, Heilongjiang 150040, China
    b Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China
    c College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China
    d College of Chemistry and Chemical Engineering, Xinyang Normal university, Xinyang, Henan 464000, China
    e Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi’an, Shaanxi 710072, China
  • Received:2019-08-13 Online:2020-03-29
  • Contact: Baoyi Ren: baoyir@126.com (B. R.); Xianghua Zhao: 4773zxh@163.com (X. Z.)
  • Supported by:
     

Abstract: The recent advances in perovskite solar cells (PSCs) surprised the traditional photovoltaic community. The power conversion efficiencies (PCEs) of PSCs have achieved more than 20%, in which the key functional layer is currently constituted by spirobifluorene (SBF)-based hole transporting materials (HTMs), typically known as spiro-OMeTAD. In the meanwhile, a new rising spiro-core, spiro[fluorene-9,9′-xanthene] (SFX), has attracted great interest for contrasting HTMs. SFX exhibits two main advantages compared with SBF: one is low-cost, the other is high stability. Hence, a lot of highly efficient HTMs based on SFX have been designed and synthesized, and the corresponding PSCs devices have shown competitive performances with spiro-OMeTAD- based cells. In this minireview, we summarize the structure-performance relationship of high-efficiency SFX-based HTMs for PSCs. The effects of the highest occupied molecular orbital (HOMO) energy level, hole mobility and conductivity, film-forming ability of SFX-based HTMs on the PCEs have been focused.

 

Key words: spiro[fluorene-9,9′-xanthene], perovskite solar cells, hole transport materials, power conversion efficiency, spiro-OMeTAD

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