Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 42, Pages 39077-39087Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b13645
Keywords
Mo1-xSnxS2 monolayer; chemical vapor depostion; NaCl; photodetector; response time
Funding
- National Nature Science Foundation [11704159]
- Natural Science Foundation of Jiangsu Province, China [BK20170167, BK20190576]
- Fundamental Research Funds for the Central Universities of China [JUSRP51726B]
- 111 Project [B12018]
- Australian Research Council (ARC)
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Elemental alloying in monolayer, two-dimensional (2D) transition metal dichalcogenides (TMDs) promises unprecedented ability to modulate their electronic structure leading to unique optoelectronic properties. MoS2 monolayer based photodetectors typically exhibit a high photoresponsivity but suffer from a low response time. Here we develop a new approach for Sn alloying in MoS2 monolayers based on the synergy of the customized chemical vapor deposition (CVD) and the effects of common salt (NaCl) to produce high-quality and large-size Mo1-xSnxS2 (x < 0.5) alloy monolayers. The composition difference results in different growth behaviors; Mo dominated alloys (x < 0.5) exhibit uniform and large size (up to 100 mu m) triangular monolayers, while Sn-dominated alloys (x > 0.5) present multilayer grains. The Mo1-xSnxS2 (x < 0.5) based photodetectors and phototransistors exhibit a maximum responsitivity of 12 mA/W and a minimum response time of 20 ms, which is faster than most reported MoS2-based photodetectors. This work offers new perspectives for precision 2D alloy engineering to improve the optoelectronic performance of TMD-based photodetectors.
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