Semi‐Locked Tetrathienylethene as a Building Block for Hole‐Transporting Materials: Toward Efficient and Stable Perovskite Solar Cells. Issue 12 (18th February 2019)

• Record Type: Journal Article
• Authors: Shen, Chao; Wu, Yongzhen; Zhang, Hao; Li, Erpeng; Zhang, Weiwei; Xu, Xiaojia; Wu, Wenjun; Tian, He; Zhu, Wei‐Hong
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 12(2019)
• Page Start: 3784
• Page End: 3789
• Publication Date: 2019-02-18
• Subjects: conformation analysis -- conjugation -- materials science -- solar cells -- structure elucidation; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201811593
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The construction of state‐of‐the‐art hole‐transporting materials (HTMs) is challenging regarding the appropriate molecular configuration for simultaneously achieving high morphology uniformity and charge mobility, especially because of the lack of appropriate building blocks. Herein a semi‐locked tetrathienylethene (TTE) serves as a promising building block for HTMs by fine‐tuning molecular planarity. Upon incorporation of four triphenylamine groups, the resulting TTE represents the first hybrid orthogonal and planar conformation, thus leading to the desirable electronic and morphological properties in perovskite solar cells (PSCs). Owing to its high hole mobility, deep lying HOMO level, and excellent thin film quality, the dopant‐free TTE‐based PSCs exhibit a very promising efficiency of over 20 % with long‐term stability, achieving to date the best performances among dopant‐free HTM‐based planar n‐i‐p structured PSCs. Abstract : Building blocks : Semi‐locked tetrathienylethene (TTE), featuring a hybrid planar and orthogonal molecular conformation, is introduced as the core for constructing state‐of‐the‐art hole‐transporting materials (HTMs). The resulting TTE achieves the best photovoltaic performance among dopant‐free HTM‐based planar n‐i‐p structured perovskite solar cells.