Engineering the Phases and Heterostructures of Ultrathin Hybrid Perovskite Nanosheets

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, Yinjie Ruan, Chao Zhu, Geert Brocks, Xiaoyong Wang, Lin Wang*Jianpu Wang, Shuxia Tao, Wei Huang*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number2002392
JournalAdvanced materials
Volume32
Issue number34
DOIs
Publication statusPublished - 27 Aug 2020

Keywords

  • 2D materials
  • cation exchange
  • heterostructures
  • hybrid perovskites
  • phase engineering

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