Volume 58, Issue 44 pp. 15721-15725
Communication

Indeno[1,2-b]carbazole as Methoxy-Free Donor Group: Constructing Efficient and Stable Hole-Transporting Materials for Perovskite Solar Cells

Jialin Wang

Jialin Wang

Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Department of Applied Chemistry, Tianjin University of Technology, No.391 Binshui Xidao, Xiqing District, Tianjin, 300384 P. R. China

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Heng Zhang

Heng Zhang

Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Department of Applied Chemistry, Tianjin University of Technology, No.391 Binshui Xidao, Xiqing District, Tianjin, 300384 P. R. China

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Bingxue Wu

Bingxue Wu

Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Department of Applied Chemistry, Tianjin University of Technology, No.391 Binshui Xidao, Xiqing District, Tianjin, 300384 P. R. China

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Dr. Zhihui Wang

Dr. Zhihui Wang

Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Department of Applied Chemistry, Tianjin University of Technology, No.391 Binshui Xidao, Xiqing District, Tianjin, 300384 P. R. China

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Dr. Zhe Sun

Dr. Zhe Sun

Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Department of Applied Chemistry, Tianjin University of Technology, No.391 Binshui Xidao, Xiqing District, Tianjin, 300384 P. R. China

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Prof. Dr. Song Xue

Prof. Dr. Song Xue

Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Department of Applied Chemistry, Tianjin University of Technology, No.391 Binshui Xidao, Xiqing District, Tianjin, 300384 P. R. China

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Prof. Dr. Yongzhen Wu

Corresponding Author

Prof. Dr. Yongzhen Wu

Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Shanghai Key Laboratory of Functional Materials Chemistry, Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Centre, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai, 200237 P. R. China

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Prof. Dr. Anders Hagfeldt

Corresponding Author

Prof. Dr. Anders Hagfeldt

Laboratory of Photomolecular Science, Ecole Polytechnique Fédédale de Lausanne, 1015 Lausanne, Switzerland

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Prof. Dr. Mao Liang

Corresponding Author

Prof. Dr. Mao Liang

Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Department of Applied Chemistry, Tianjin University of Technology, No.391 Binshui Xidao, Xiqing District, Tianjin, 300384 P. R. China

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First published: 26 August 2019
Citations: 106

Graphical Abstract

Balancing act: The indeno[1,2-b]carbazole donor not only combines the characteristics of carbazole and fluorene, but also exhibits excellent thermal stability and high hole mobility as a result of the bulky planar structure. Hole-transporting materials based on this methoxy-free donor demonstrate a high efficiency and stability simultaneously, providing a promising strategy for developing efficient and stable perovskite-based solar cells.

Abstract

With perovskite-based solar cells (PSCs) now reaching efficiencies of greater than 20 %, the stability of PSC devices has become a critical challenge for commercialization. However, most efficient hole-transporting materials (HTMs) thus far still rely on the state-of-the-art methoxy triphenylamine (MOTPA) donor unit in which methoxy groups usually reduce the device stability. Herein, a carbazole-fluorene hybrid has been employed as a methoxy-free donor to construct organic HTMs. The indeno[1,2-b]carbazole group not only inherits the characteristics of carbazole and fluorene, but also exhibits additional advantages arising from the bulky planar structure. Consequently, M129, endowed with indeno[1,2-b]carbazole simultaneously exhibits a promising efficiency of over 20 % and superior long-term stability. The hybrid strategy toward the methoxy-free donor opens a new avenue for developing efficient and stable HTMs.

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