4.8 Article

Dissolution-precipitation growth of uniform and clean two dimensional transition metal dichalcogenides

Journal

NATIONAL SCIENCE REVIEW
Volume 8, Issue 3, Pages -

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwaa115

Keywords

dissolution-precipitation growth; two dimensional materials; transition metal dichalcogenides; uniform; clean

Funding

  1. National Natural Science Foundation of China [51722206, 51991340, 51991343, 11974156, 51920105002]
  2. Youth 1000-Talent Program of China
  3. National Key RD Program [2018YFA0307200]
  4. Guangdong Innovative and Entrepreneurial Research Team Program [2017ZT07C341]
  5. Guandong International Science Collaboration Project [2019A050510001]
  6. Bureau of Industry and Information Technology of Shenzhen for the '2017 Graphene Manufacturing Innovation Center Project [201901171523]
  7. Development and Reform Commission of Shenzhen Municipality
  8. Presidential fund

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The study introduces a new 'dissolution-precipitation' (DP) growth method, which controls the supply of reactants by sealing metal sources in glass substrates, resulting in highly uniform and clean monolayer TMDCs through surface reactions.
Two dimensional transition metal dichalcogenides (TMDCs) have attracted much interest and shown promise in many applications. However, it is challenging to obtain uniform TMDCs with clean surfaces, because of the difficulties in controlling the way the reactants are supplied to the reaction in the current chemical vapor deposition growth process. Here, we report a new growth approach called 'dissolution-precipitation' (DP) growth, where the metal sources are sealed inside glass substrates to control their feeding to the reaction. Noteworthy, the diffusion of metal source inside glass to its surface provides a uniform metal source on the glass surface, and restricts the TMDC growth to only a surface reaction while eliminating unwanted gas-phase reaction. This feature gives rise to highly uniform monolayer TMDCs with a clean surface on centimeter-scale substrates. The DP growth works well for a large variety of TMDCs and their alloys, providing a solid foundation for the controlled growth of clean TMDCs by the fine control of the metal source. 2D materials with good quality and ultraclean surface were obtained by a universal dissolution-precipitation growth method that precisely controls the metal source and restricts the growth of materials to surface reaction.

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