Growth of a Large, Single-Crystalline WS2 Monolayer for High-Performance Photodetectors by Chemical Vapor Deposition
1
Hubei Engineering Technology Research Center of Energy Photoelectric Device and System, Hubei University of Technology, Wuhan 430068, China
2
Hubei Collaborative Innovation Center for High-Efficient Utilization of Solar Energy, Wuhan 430068, China
3
School of Science, Hubei University of Technology, Wuhan 430068, China
Academic Editor: Ha Duong Ngo
Micromachines 2021, 12(2), 137; https://doi.org/10.3390/mi12020137
Received: 17 December 2020
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Revised: 19 January 2021
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Accepted: 25 January 2021
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Published: 27 January 2021
2D WS2 is a promising candidate for the next generation nanoelectronics, spintronics, valleytronics, and optoelectronics. However, the uncontrollably large-area growth of WS2 nanosheets and their unsatisfactory performance of the photodetectors based on WS2 hindered its applications. Here, we proposed a CVD method using tungstic acid as the precursors to grow WS2 flakes. After being characterized by AFM, Raman, PL, and TEM, we found the as-grown WS2 flakes were high-quality structures. Then the photodetectors based on the as-grown WS2 were fabricated, which exhibited high responsivity (7.3 A W−1), a fast response rate (a response time of 5 ms and a recovery time of 7 ms), prefect external quantum efficiency (EQE) (1814%), and remarkable detectivity (D*) (3.4 × 1012 Jones). Our works provided a new CVD method to grow some high-quality WS2 nanosheets.
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Keywords:
WS2 flakes; tungstic acid; chemical vapor deposition; photodetectors
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MDPI and ACS Style
Chen, Y. Growth of a Large, Single-Crystalline WS2 Monolayer for High-Performance Photodetectors by Chemical Vapor Deposition. Micromachines 2021, 12, 137. https://doi.org/10.3390/mi12020137
AMA Style
Chen Y. Growth of a Large, Single-Crystalline WS2 Monolayer for High-Performance Photodetectors by Chemical Vapor Deposition. Micromachines. 2021; 12(2):137. https://doi.org/10.3390/mi12020137
Chicago/Turabian StyleChen, Ying. 2021. "Growth of a Large, Single-Crystalline WS2 Monolayer for High-Performance Photodetectors by Chemical Vapor Deposition" Micromachines 12, no. 2: 137. https://doi.org/10.3390/mi12020137
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