Generalized Self‐Doping Engineering towards Ultrathin and Large‐Sized Two‐Dimensional Homologous Perovskites. Issue 47 (20th October 2017)

• Record Type: Journal Article
• Authors: Chen, Junnian; Wang, Yaguang; Gan, Lin; He, Yunbin; Li, Huiqiao; Zhai, Tianyou
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 47(2017)
• Page Start: 14893
• Page End: 14897
• Publication Date: 2017-10-20
• Subjects: 2D structures -- 2D homologous perovskites -- self-doping -- ultrathin; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201708434
• Languages: English
• ISSNs: 1433-7851

Abstract

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 Br3 n +1 (1< n <∞) perovskites uses 2D (BA)2 PbBr4 perovskites as the template with MA + dopant. Ultrathin (BA)2 (MA) n −1 Pb n Br3 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 Br3 n +1 perovskites are potential materials for photodetectors with promising photoresponse and stability. Abstract : Transformers : A generalized self‐doping engineering was developed for transforming 2D perovskites into 2D homologous (BA)2 (MA) n −1 Pb n Br3 n +1 perovskites. 2D homologous perovskites with a thickness down to 4.2 nm and lateral dimensions up to 57 μm have been achieved. An intercalation and merging mechanism has also been proposed. The high quality of products was revealed by systematic characterization, verifying the high‐performance photodetectors.