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Title

Organic Sulfonium‐Stabilized High‐Efficiency Cesium or Methylammonium Lead Bromide Perovskite Nanocrystals.

Authors

Cai, Yuting; Li, Wenbo; Tian, Dongjie; Shi, Shuchen; Chen, Xi; Gao, Peng; Xie, Rong‐Jun

Abstract

Herein, we report a new X‐type ligand, i.e. organic sulfonium bromide, for high‐efficiency CsPbBr3 and MAPbBr3 (MA=methylammonium) perovskite nanocrystals (PNCs). We first confirmed the facile synthesis of the titled ligands in N,N‐dimethylformamide at room temperature. By reacting dodecylmethylsulfide with allyl bromide, (3‐bromopropyl)trimethoxysilane, and 1,4‐dibromobutane, respectively, three representative ligands (named DAM, DSM, and DMM) are acquired. All of them result in CsPbBr3 and MAPbBr3 PNCs with near‐unity photoluminescence quantum yield (PLQY) and decent ambient stability (no less than 90 % PLQY after 2 months) using a room‐temperature ligand‐assisted reprecipitation technique. Among them, DSM and DMM endow CsPbBr3 PNCs with higher thermal/light stability arising from the cross‐linkable or bidentate ligand structure. Further, DSM‐CsPbBr3 PNCs can be incorporated into polystyrene through in situ thermal polymerization and the composite shows a record‐high PLQY of 93.8 %.

Subjects

NANOCRYSTALS; PEROVSKITE; CESIUM; BROMIDES; METHYLAMMONIUM

Publication

Angewandte Chemie, 2022, Vol 134, Issue 37, p1

ISSN

0044-8249

Publication type

Academic Journal

DOI

10.1002/ange.202209880

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