High-yield exfoliation of 2D semiconductor monolayers and reassembly of organic/inorganic artificial superlattices

Zhaoyang Lin, Zhong Wan, Frank Song, Bolong Huang, Chuancheng Jia, Qi Qian, Joon Sang Kang, Yutong Wu, Xingxu Yan, Lele Peng, Chengzhang Wan, Jingyuan Zhou, Zdenek Sofer, Imran Shakir, Zeyad Almutairi, Sarah Tolbert, Xiaoqing Pan, Yongjie Hu, Yu Huang, Xiangfeng Duan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

The scalable preparation of high-purity monolayers is essential for practically integrating two-dimensional (2D) semiconductors in diverse technologies but remains a persistent challenge. Previous efforts to exfoliate 2D layered crystals by the organic ammonium intercalation usually produce few-layer nanosheets owing to a self-retarding effect that hinders the complete intercalation in neighboring layers. Herein, we report a unique “intercalation and separation” chemistry with a constant self-refreshing crystal surface that mitigates the self-retarding effect to ensure a complete intercalation of the bulk crystal, ultimately enabling high-yield solution-phase exfoliation of 2D semiconductor monolayers in excellent purity (e.g., monolayer purity of >95% for In2Se3 and InSe). Furthermore, we have assembled large-area organic/inorganic hybrid superlattices with diverse organic molecules and inorganic 2D monolayer crystals, thus creating a family of artificial superlattice materials with atomically modulated chemical compositions, widely tunable superlattice periodicities, and specifically tailorable electronic and thermal properties.

Original languageEnglish
Pages (from-to)1887-1902
Number of pages16
JournalChem
Volume7
Issue number7
DOIs
Publication statusPublished - 8 Jul 2021

Keywords

  • 2D semiconductor monolayers
  • exfoliation
  • intercalation
  • organic/inorganic artificial superlattices
  • SDG9: Industry, innovation, and infrastructure
  • solution-processable
  • tunneling

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Biochemistry, medical
  • Materials Chemistry

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