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ACS Appl Mater Interfaces. 2019 Sep 25;11(38):35270-35276. doi: 10.1021/acsami.9b12591. Epub 2019 Sep 11.

Giant Stability Enhancement of CsPbX3 Nanocrystal Films by Plasma-Induced Ligand Polymerization.

Author information

1
School of Materials Science and Engineering , Nanchang University , Nanchang 330031 , P.R. China.
2
State Key Lab for Materials Processing and Die & Mould Technology, Wuhan National High Magnetic Field Center, School of Materials Science and Engineering , Huazhong University of Science and Technology , Wuhan 430074 , P.R. China.
3
Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering , Huazhong University of Science and Technology , Wuhan 430074 , P.R. China.

Abstract

All-inorganic CsPbX3 (X = Cl, Br, and I) nanocrystals (NCs) are emerging as attractive semiconductor materials because of their outstanding optical properties. The low resistance of CsPbX3 NCs to light, heat, oxygen, and water has been recognized as a major obstacle to their practical applications. Here, we demonstrate that the stability of CsPbX3 NC films can be dramatically enhanced by Ar plasma treatment. It is revealed that plasma irradiation can induce ligand polymerization in the NC films if the ligands contain unsaturated carbon bonds. The ligand polymerization leads to encapsulation of the NCs in the ligand polymers. Because of the precise localization of the in situ ligand polymerization under plasma irradiation and the high NC content in the films without extra additives, the polymerized area can be precisely defined down to several micrometers. This enables easy fabrication of high-resolution NC pixels for next generation displays.

KEYWORDS:

perovskite nanocrystal; plasma treatment; polymerization; quantum dot display; stability

PMID:
31480844
DOI:
10.1021/acsami.9b12591

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