Organic Sulfonium‐Stabilized High‐Efficiency Cesium or Methylammonium Lead Bromide Perovskite Nanocrystals. (3rd August 2022)

• Record Type: Journal Article
• Authors: Cai, Yuting; Li, Wenbo; Tian, Dongjie; Shi, Shuchen; Chen, Xi; Gao, Peng; Xie, Rong‐Jun
• Is Part Of: Angewandte Chemie. Volume 134:Number 37(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-03
• Subjects: CsPbBr3 -- MAPbBr3 -- Nanocrystals -- Perovskite -- Sulfonium; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202209880
• Languages: English
• ISSNs: 0044-8249

Abstract

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 %. Abstract : Organic sulfonium bromide was introduced as a new X‐type ligand to synthesize cesium or methylammonium lead bromide perovskite nanocrystals (PNCs). The purified PNCs exhibited near‐unity photoluminescence quantum yields (PLQYs) without post‐treatments and showed high ambient stability. The CsPbBr3 PNCs can be incorporated into polystyrene, and the composite exhibited a record‐high PLQY of 93.8 %.