A stable lead halide perovskite nanocrystals protected by PMMA  

一种高分子保护的铅卤钙钛矿纳米晶（英文）

作　　者：李晓 薛振杰 罗聃 黄川辉 刘立志 乔学志 刘聪 宋倩 闫聪 李迎春 王铁 

机构地区：[1]School of Materials Science and Engineering, North University of China [2]Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences

出　　处：《Science China Materials》2018年第3期363-370,共8页中国科学（材料科学（英文版）

基　　金：supported by the Thousand Young Talents Program;the National Natural Science Foundation of China (21422507,21635002 and 21321003)

摘　　要：To enhance the stability in humidity is very crucial to hybrid organic-inorganic lead halide perovskites in a broad range of applications. This report describes a coating stratergy of perovskite nanocrystals via poly- methylmethacrylate-introdnced ligand-assisted reprecipita- tion, using the interactions between the Pb cations on the surface of perovskite nanocrystals and the functional ester carbonyl groups in polymethylmethacrylate framework. The hydrophobic framework shields the open metal sites of hybrid organic-inorganic lead halide perovskites from being attacked by water, effectively retarding the diffusion of water into the perovskite nanocrystals. The as-prepared films demonstrate high resistance to heat and moisture. Additionally, the in- troduction of polymethylmethacrylate into ligand-assisted reprecipitation can effectively control the bulk precipitation and promote the stability of the perovskite solution.有机-无机杂化铅卤钙钛矿易于加工、带隙可调、电荷转移速率高,是一种具有广泛应用前景的新型光电半导体材料.在潮湿空气中的稳定性是钙钛矿实现产业化应用亟待解决的问题.本文介绍了聚甲基丙烯酸甲酯作为配体利用配体辅助再沉淀实现了钙钛矿纳米晶的聚合物包裹.聚合物作为疏水性骨架通过功能性酯羰基与钙钛矿表面铅化学键合实现了表面铅位点的全覆盖,有效阻止该位点被水分子占据,形成的紧密界面层有效延缓水分子扩散到钙钛矿纳米晶中.制备的薄膜表现出超高的浸水稳定性.

关 键 词：perovskite nanocrystals polymer framework surfacecoatings interface phase 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ317[化学工程—高聚物工业]