期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 844, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.156102
关键词
Core-shell; Multidentate copolymer; Perovskite nanocrystals; Reverse micelles; Self-assembly; Stability
资金
- National Natural Science Foundation of China (NSFC) [51802254, 51873173]
- China Postdoctoral Science Foundation [2017M623149, 2019T120902]
- Fundamental Research Funds for the Central Universities [xjj2018053]
- Shaanxi province Youth Foundation [2018JQ5011]
Lead halide perovskite nanocrystals (NCs) have shown exceptional optoelectronic characteristics and photovoltaic performance; however, their instability has limited their use in optoelectronic applications. Herein, we introduce a facile and effective in-situ synthesis strategy to prepare stable core-shell colloidal perovskite nanocrystal-polymer micelle composites (abbr. ap-POSS-PMMA-b-PDMAEMA@CsPbBr3) by using amphiphilic copolymer (abbr. ap-POSS-PMMA-b-PDMAEMA) self-assembled reverse micelle templates. The amphiphilic block copolymer with hydrophobic (ap-POSS and polymethylmethacrylate, PMMA) and hydrophilic blocks (poly 2-(dimethylamino)ethyl methacrylate, PDMAEMA) can be regulated to self-assemble into reverse micelles. The micelle serves as a confined nanoreactor during perovskite crystallization, which passivates the perovskite surface by forming a multidentate capping shell and yields the formation of multi-nanocubes with size between 6 and 8 nm and a photoluminescence quantum yield (PLQY) that surpasses 60%. Benefitting from femtosecond transient absorption (fs TA) and time-resolved photoluminescence (PL) spectroscopy studies, the excited carrier dynamics of the obtained composites substantiate fewer internal band-gap trap states from micelle-induced CsPbBr3 NCs. The films cast from these composites showed enhanced water-resistant properties as compared to bare NCs and previously reported encapsulated NCs. Therefore, the copolymer reverse micelle induced in-situ grown NCs provide a potential approach for further engineering the morphology of NC-based composites and open the door to potential scalable and robust optoelectronic applications. (c) 2020 Elsevier B.V. All rights reserved.
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