Growth of a Large, Single-Crystalline WS2 Monolayer for High-Performance Photodetectors by Chemical Vapor Deposition

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 propos...

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Bibliographic Details
Published inMicromachines (Basel) Vol. 12; no. 2; p. 137
Main Author Chen, Ying
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 27.01.2021
MDPI
Subjects
Acids
Chemical vapor deposition
Efficiency
Flakes
Lasers
Light
Nanoelectronics
Nanostructure
Optoelectronics
photodetectors
Photometers
Quantum efficiency
Recovery time
Response time
Single crystals
Spectrum analysis
Spintronics
tungstic acid
WS2 flakes
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Summary: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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ISSN:2072-666X
2072-666X
DOI:10.3390/mi12020137