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

Jialin Wang; Heng Zhang; Bingxue Wu; Zhihui Wang; Zhe Sun; Song Xue; Yongzhen Wu; Anders Hagfeldt; Mao Liang

doi:10.1002/anie.201909117

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

Angew Chem Int Ed Engl. 2019 Oct 28;58(44):15721-15725. doi: 10.1002/anie.201909117. Epub 2019 Sep 16.

Authors

Jialin Wang¹, Heng Zhang¹, Bingxue Wu¹, Zhihui Wang¹, Zhe Sun¹, Song Xue¹, Yongzhen Wu², Anders Hagfeldt³, Mao Liang¹

Affiliations

¹ 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.
² 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.
³ Laboratory of Photomolecular Science, Ecole Polytechnique Fédédale de Lausanne, 1015, Lausanne, Switzerland.

PMID: 31449726
DOI: 10.1002/anie.201909117

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.

Keywords: conjugation; energy conversion; fused-ring systems; materials science; solar cells.

Abstract

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