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Dithieno[3,2‐b:2′,3′‐d]pyrrole Cored p‐Type Semiconductors Enabling 20 % Efficiency Dopant‐Free Perovskite Solar Cells
Author(s) -
Zhou Jie,
Yin Xinxing,
Dong Zihao,
Ali Amjad,
Song Zhaoning,
Shrestha Niraj,
Bista Sandip Singh,
Bao Qinye,
Ellingson Randy J.,
Yan Yanfa,
Tang Weihua
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201905624
Subject(s) - dopant , perovskite (structure) , materials science , semiconductor , pyrrole , energy conversion efficiency , doping , photoluminescence , organic semiconductor , nanotechnology , optoelectronics , crystallography , chemistry , organic chemistry
Organic p‐type semiconductors with tunable structures offer great opportunities for hybrid perovskite solar cells (PVSCs). We report herein two dithieno[3,2‐b:2′,3′‐d]pyrrole (DTP) cored molecular semiconductors prepared through π‐conjugation extension and an N‐alkylation strategy. The as‐prepared conjugated molecules exhibit a highest occupied molecular orbital (HOMO) level of −4.82 eV and a hole mobility up to 2.16×10 −4 cm 2 V −1 s −1 . Together with excellent film‐forming and over 99 % photoluminescence quenching efficiency on perovskite, the DTP based semiconductors work efficiently as hole‐transporting materials (HTMs) for n‐i‐p structured PVSCs. Their dopant‐free MA 0.7 FA 0.3 PbI 2.85 Br 0.15 devices exhibit a power conversion efficiency over 20 %, representing one of the highest values for un‐doped molecular HTMs based PVSCs. This work demonstrates the great potential of using a DTP core in designing efficient semiconductors for dopant‐free PVSCs.