期刊
NANOTECHNOLOGY
卷 28, 期 19, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aa6827
关键词
ultrathin MoS2 film; atomic layer deposition; Raman modes
资金
- Natural Science Foundation of China [U1332134, 51675360, 51675502]
- Natural Science Foundation of Suzhou [SYG201329]
- Fundamental Research Funds for the Central Universities [3202006301, 3202006403]
- Qing Lan Project
- International Foundation for Science, Stockholm, Sweden
- Organization for the Prohibition of Chemical Weapons
- Hague, Netherlands [F/4736-2]
- Natural Science Foundation of Jiangsu Province [BK20150505]
- Tribology Science Fund of State Key Laboratory of Tribology [SKLTKF15A11]
- Open Research Fund of State Key Laboratory of High Performance Complex Manufacturing, Central South University [Kfkt2016-11]
- Open Research Fund of State Key Laboratory of solid lubrication [LSL-1607]
Monolayer and/or atomically thin transition metal dichalcogenides cover a wide range of two-dimensional (2D) materials, whose fascinating semiconducting and optical properties have made them promising candidate materials for optoelectronic devices. Controllable growth of these materials is critical for their device applications. By using MoCl5 and H2S as precursors, monolayer and ultrathin molybdenum disulfide (MoS2) films with controlled lamellar structure have been directly built layer by layer on SiO2 substrates without being followed by high-temperature annealing. Furthermore, the thickness of MoS2 films can be precisely regulated by applying different atomic layer deposition (ALD) cycles. Once an ALD cycle is applied, one molecular layer of MoS2 material will be 'added' on the substrate or original existing MoS2 films. At the initial stage (one to three ALD cycles), the density of MoS2 materials increases with an increase in ALD cycles, while a large area of continuous MoS2 film on the substrate can be obtained when four or more ALD cycles are applied. In this way, excellent triangular crystals of MoS2 with controlled atomic size in thickness and a highly oriented hexagonal crystal structures can be obtained by applying definite ALD cycles.
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