A Two‐Dimensional Hole‐Transporting Material for High‐Performance Perovskite Solar Cells with 20 % Average Efficiency

• Published in: Angewandte Chemie International Edition Vol. 57; no. 34; pp. 10959 - 10965
• Main Authors: Ge, Qian‐Qing, Shao, Jiang‐Yang, Ding, Jie, Deng, Li‐Ye, Zhou, Wen‐Ke, Chen, Yao‐Xuan, Ma, Jing‐Yuan, Wan, Li‐Jun, Yao, Jiannian, Hu, Jin‐Song, Zhong, Yu‐Wu
• Format: Journal Article
• Language: English
• Published: WEINHEIM Wiley 20.08.2018; Wiley Subscription Services, Inc
• Edition: International ed. in English
• Subjects: Chemical synthesis; Chemistry; Chemistry, Multidisciplinary; Electrochemistry; Energy conversion efficiency; hole-transporting materials; Perovskites; Photoluminescence; Photons; Photovoltaic cells; Physical Sciences; Pyrene; Science & Technology; Solar cells; triarylamines; perovskites; CORE; LOW-COST; triarylamines; STABILITY; hole-transporting materials; solar cells; HALIDE PEROVSKITES; pyrene; LAYERS
• ISSN: 1433-7851; 1521-3773; 1521-3773
• DOI: 10.1002/anie.201806392

A readily available small molecular hole‐transporting material (HTM), OMe‐TATPyr, was synthesized and tested in perovskite solar cells (PSCs). OMe‐TATPyr is a two‐dimensional π‐conjugated molecule with a pyrene core and four phenyl‐thiophene bridged triarylamine groups. It can be readily synthesized in gram scale with a low lab cost of around US$ 50 g−1. The incorporation of the phenyl‐thiophene units in OMe‐TATPyr are beneficial for not only carrier transportation through improved charge delocalization and intermolecular stacking, but also potential trap passivation via Pb–S interaction as supported by depth‐profiling XPS, photoluminescence, and electrochemical impedance analysis. As a result, an impressive best power conversion efficiency (PCE) of up to 20.6 % and an average PCE of 20.0 % with good stability has been achieved for mixed‐cation PSCs with OMe‐TATPyr with an area of 0.09 cm2. A device with an area of 1.08 cm2 based on OMe‐TATPyr demonstrates a PCE of 17.3 %. A 2D hole‐transporting material with a pyrene core and four phenyl‐thiophene bridged triarylamine groups, OMe‐TATPyr, was readily synthesized at low cost on a gram scale. A power conversion efficiency (PCE) of up to 20.6 % (average PCE 20.0 %) was achieved for mixed‐cation perovskite solar cells with OMe‐TATPyr, outperforming devices with Spiro‐OMeTAD.