文献类型：期刊文献

英文题名：Stable Bismuth-Doped Lead Halide Perovskite Core-Shell Nanocrystals by Surface Segregation Effect

作者：Zhu, Jingrun[1];Zhou, Lihui[2,3];Zhu, Yihua[1];Huang, Jianfei[4];Hou, Lu[1];Shen, Jianhua[1];Dai, Sheng[2,3];Li, Chunzhong[1,5]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Frontier Sci Ctr Materiobiol & Dynam Chem, Sch Mat Sci & Engn,Key Lab Ultrafine Mat,Minist E, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Adv Mat, Sch Chem & Mol Engn, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Inst Fine Chem, Shanghai 200237, Peoples R China;[4]Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Dept Chem & Biochem, Santa Barbara, CA 93106 USA;[5]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：18

期号：3

外文期刊名：SMALL

收录：;EI(收录号：20214811242436);WOS:【SCI-EXPANDED(收录号:WOS:000722887900001)】；

基金：J.Z. and L.Z. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (21838003, 21676093, 91834301, 21776092, 21808061), the Shanghai Scientific and Technological Innovation Project (19JC1410400), the Innovation Program of Shanghai Municipal Education Commission, and the Fundamental Research Funds for the Central Universities (222201718002). S.D. acknowledges the support by Shanghai Rising-star Program (20QA1402400) and the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning. Additional support was provided by the Feringa Nobel Prize Scientist Joint Research Center.

语种：英文

外文关键词：core-shell structure; nanocrystals; perovskites; stability

摘要：Lead halide perovskite nanocrystals (NCs) exhibit excellent optoelectronic performance, however, the broad application is limited by their poor stability. Herein, a strategy for stable core-shell structured bismuth-doped lead halide perovskite NCs is reported. The stable core-shell perovskite NCs are prepared based on heterovalent substitutions and surface segregation effect. Core-shell features are revealed through advanced characterization and structure analyses. Meanwhile, the transfer of carriers between the core and the shell is observed by ultrafast transient absorption spectroscopy. The core-shell structured perovskite NCs exhibit outstanding structure stability and retain 97% of the original photocatalytic efficiency after cycle experiments under moisture ambient and light irradiation. Such a core-shell structure constructs gradient energy levels. These findings are expected to facilitate the development of stable lead halide perovskite devices.