Indenocarbazole as Methoxy‐Free Donor Group: Constructing Efficient and Stable Hole‐Transporting Materials for Perovskite Solar Cells

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 (...

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Published inAngewandte Chemie Vol. 131; no. 44; pp. 15868 - 15872
Main Authors Wang, Jialin, Zhang, Heng, Wu, Bingxue, Wang, Zhihui, Sun, Zhe, Song, Xue, Wu, Yongzhen, Hagfeldt, Anders, Mao, Liang
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 01.10.2019
Subjects
Carbazole
Carbazoles
Chemistry
Commercialization
Fluorene
Perovskites
Photovoltaic cells
Planar structures
Solar cells
Stability
Transportation
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Summary: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.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201909117