Affiliation:
1. Thin Film Materials Research Center Korea Research Institute of Chemical Technology 141 Gajeong‐ro, Yuseong‐gu Daejeon 34114 Republic of Korea
2. Department of Materials Science and Engineering Ulsan National Institute of Science and Technology 50 UNIST‐gil, Ulju‐gun Ulsan 44919 Republic of Korea
3. Department of Advanced Materials Science and Engineering Sungkyunkwan University 2066 Seobu‐ro Suwon‐si Gyeonggi‐do 16419 Republic of Korea
Abstract
AbstractThe recent introduction of alkali metal halide catalysts for chemical vapor deposition (CVD) of transition metal dichalcogenides (TMDs) has enabled remarkable two‐dimensional (2D) growth. However, the process development and growth mechanism require further exploration to enhance the effects of salts and understand the principles. Herein, simultaneous predeposition of a metal source (MoO3) and salt (NaCl) by thermal evaporation is adopted. As a result, remarkable growth behaviors such as promoted 2D growth, easy patterning, and potential diversity of target materials can be achieved. Step‐by‐step spectroscopy combined with morphological analyses reveals a reaction path for MoS2 growth in which NaCl reacts separately with S and MoO3 to form Na2SO4 and Na2Mo2O7 intermediates, respectively. These intermediates provide a favorable environment for 2D growth, including an enhanced source supply and liquid medium. Consequently, large grains of monolayer MoS2 are formed by self‐assembly, indicating the merging of small equilateral triangular grains on the liquid intermediates. This study is expected to serve as an ideal reference for understanding the principles of salt catalysis and evolution of CVD in the preparation of 2D TMDs.
Funder
National Research Foundation of Korea
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
2 articles.
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