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Engineering the Phases and Heterostructures of Ultrathin Hybrid Perovskite Nanosheets
Author(s) -
Sun Yan,
Yin Yao,
Pols Mike,
Zhong Jingxian,
Huang Zhen,
Liu Bowen,
Liu Jinqiu,
Wang Wei,
Xie Hongguang,
Zhan Guixiang,
Zhou Zishu,
Zhang Wei,
Wang Pengcheng,
Zha Chenyang,
Jiang Xiaohong,
Ruan Yinjie,
Zhu Chao,
Brocks Geert,
Wang Xiaoyong,
Wang Lin,
Wang Jianpu,
Tao Shuxia,
Huang Wei
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202002392
Subject(s) - heterojunction , materials science , perovskite (structure) , nanosheet , monolayer , nanotechnology , phase (matter) , hexagonal crystal system , surface modification , optoelectronics , chemical engineering , crystallography , chemistry , organic chemistry , engineering
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 PbI 2 as precursor and template, perovskite nanosheets of varying thickness and hexagonal shape on diverse substrates is obtained. Multiple phases, such as PbI 2 , MAPbI 3 and FAPbI 3 , 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 PbI 2 . Perovskite‐based vertical heterostructures show strong interfacial coupling with 2D materials. As a demonstration, monolayer MoS 2 /MAPbI 3 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.