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A Two‐Dimensional Hole‐Transporting Material for High‐Performance Perovskite Solar Cells with 20 % Average Efficiency
Author(s) -
Ge QianQing,
Shao JiangYang,
Ding Jie,
Deng LiYe,
Zhou WenKe,
Chen YaoXuan,
Ma JingYuan,
Wan LiJun,
Yao Jiannian,
Hu JinSong,
Zhong YuWu
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201806392
Subject(s) - thiophene , energy conversion efficiency , materials science , passivation , perovskite (structure) , stacking , x ray photoelectron spectroscopy , delocalized electron , conjugated system , chemical engineering , chemistry , nanotechnology , optoelectronics , crystallography , organic chemistry , polymer , layer (electronics) , engineering , composite material
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 cm 2 . A device with an area of 1.08 cm 2 based on OMe‐TATPyr demonstrates a PCE of 17.3 %.