异质结
材料科学
纳米片
钙钛矿(结构)
纳米技术
单层
相(物质)
六方晶系
表面改性
光电子学
化学工程
结晶学
工程类
有机化学
化学
作者
Yan Sun,Yao Yin,Mike Pols,Jingxian Zhong,Zhen Huang,Bowen Liu,Jinqiu Liu,Wei Wang,Hongguang Xie,Guixiang Zhan,Zishu Zhou,Wei Zhang,Pengcheng Wang,Chenyang Zha,Xiaohong Jiang,Yin-Jie Ruan,Chao Zhu,Geert Brocks,Xiaoyong Wang,Lin Wang,Jianpu Wang,Shuxia Tao,Wei Huang
标识
DOI:10.1002/adma.202002392
摘要
Low-dimensional perovskites have gained increasing attention recently, and engineering their material phases, structural patterning and interfacial properties is crucial for future perovskite-based applications. Here a phase and heterostructure engineering on ultrathin perovskites, through the reversible cation exchange of hybrid perovskites and efficient surface functionalization of low-dimensional materials, is demonstrated. Using PbI2 as precursor and template, perovskite nanosheets of varying thickness and hexagonal shape on diverse substrates is obtained. Multiple phases, such as PbI2 , MAPbI3 and FAPbI3 , can be flexibly designed and transformed as a single nanosheet. A perovskite nanosheet can be patterned using masks made of 2D materials, fabricating lateral heterostructures of perovskite and PbI2 . Perovskite-based vertical heterostructures show strong interfacial coupling with 2D materials. As a demonstration, monolayer MoS2 /MAPbI3 stacks give a type-II heterojunction. The ability to combine the optically efficient perovskites with versatile 2D materials creates possibilities for new designs and functionalities.
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