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Generalized Self‐Doping Engineering towards Ultrathin and Large‐Sized Two‐Dimensional Homologous Perovskites
Author(s) -
Chen Junnian,
Wang Yaguang,
Gan Lin,
He Yunbin,
Li Huiqiao,
Zhai Tianyou
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201708434
Subject(s) - intercalation (chemistry) , dopant , doping , homologous series , materials science , photovoltaics , crystallography , perovskite (structure) , optoelectronics , nanotechnology , chemistry , inorganic chemistry , ecology , photovoltaic system , biology
Abstract Two‐dimensional (2D) homologous perovskites are arousing intense interest in photovoltaics and light‐emitting fields, attributing to significantly improved stability and increasing optoelectronic performance. However, investigations on 2D homologous perovskites with ultrathin thickness and large lateral dimension have been seldom reported, being mainly hindered by challenges in synthesis. A generalized self‐doping directed synthesis of ultrathin 2D homologous (BA) 2 (MA) n −1 Pb n Br 3 n +1 (1< n <∞) perovskites uses 2D (BA) 2 PbBr 4 perovskites as the template with MA + dopant. Ultrathin (BA) 2 (MA) n −1 Pb n Br 3 n +1 perovskites are formed via an intercalation–merging mechanism, with thickness shrinking down to 4.2 nm and the lateral dimension to 57 μm. The ultrathin 2D homologous (BA) 2 (MA) n −1 Pb n Br 3 n +1 perovskites are potential materials for photodetectors with promising photoresponse and stability.