期刊
ACS NANO
卷 9, 期 6, 页码 6178-6187出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b01480
关键词
transition metal dichalcogenide; monolayer; atmospheric pressure chemical vapor deposition (APCVD); transfer; recyclability
类别
资金
- ARC DECRA [DE120101569]
- DSI
- DP [DP140101501]
- Monash University
- APA
- IPRS
- 863 Program [2013AA031903]
- youth 973 program [2015CB932700]
- National Natural Science Foundation of China [51222208, 51290273, 91433107]
Two-dimensional layered transition metal dichalcogenides (TMDs) show intriguing potential for optoelectronic devices due to their exotic electronic and optical properties. Only a few efforts have been dedicated to large-area growth of TMDs. Practical applications will require improving the efficiency and reducing the cost of production, through (1) new growth methods to produce large size TMD monolayer with less-stringent conditions, and (2) nondestructive transfer techniques that enable multiple reuse of growth substrate. In this work, we report to employ atmospheric pressure chemical vapor deposition (APCVD) for the synthesis of large size (>100 mu m) single crystals of atomically thin tungsten disulfide (WS2), a member of TMD family, on sapphire substrate. More importantly, we demonstrate a polystyrene (PS) mediated delamination process via capillary force in water which c-Sapphire reduces the etching time in base solution and imposes only minor damage to the sapphire substrate. The transferred WS2 flakes are of excellent continuity and exhibit comparable electron mobility after several growth cycles on the reused sapphire substrate. Interestingly, the photoluminescence emission from WS2 grown on the recycled sapphire is much higher than that on fresh sapphire, possibly due to p-type doping of monolayer WS2 flakes by a thin layer of water intercalated at the atomic steps of the recycled sapphire substrate. The growth and transfer techniques described here are expected to be applicable to other atomically thin TMD materials.
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