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Thiophene Cation Intercalation to Improve Band‐Edge Integrity in Reduced‐Dimensional Perovskites
Author(s) -
Ni Chuyi,
Huang Yahao,
Zeng Tao,
Chen Daohong,
Chen Hao,
Wei Mingyang,
Johnston Andrew,
Proppe Andrew H.,
Ning Zhijun,
Sargent Edward H.,
Hu Peng,
Yang Zhenyu
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202006112
Subject(s) - perovskite (structure) , intercalation (chemistry) , photovoltaics , energy conversion efficiency , halide , materials science , thiophene , ligand (biochemistry) , crystal (programming language) , chemistry , crystal structure , inorganic chemistry , crystallography , optoelectronics , photovoltaic system , organic chemistry , ecology , biochemistry , receptor , biology , computer science , programming language
The insertion of large organic cations in metal halide perovskites with reduced‐dimensional (RD) crystal structures increases crystal formation energy and regulates the growth orientation of the inorganic domains. However, the power conversion performance is curtailed by the insulating nature of the bulky cations. Now a series of RD perovskites with 2‐thiophenmethylammonium (TMA) as the intercalating cation are investigated. Compared with traditional ligands, TMA demonstrates improved electron transfer in the inorganic framework. TMA modifies the near‐band‐edge integrity of the RD perovskite, improving hole transport. A power conversion efficiency of 19 % is achieved, the highest to date for TMA‐based RD perovskite photovoltaics; these TMA devices provide a 12 % relative increase in PCE compared to control RD perovskite devices that use PEA as the intercalating ligand, a result of the improved charge transfer from the inorganic layer to the organic ligands.