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- Title
CVD growth of large-area monolayer WS<sub>2</sub> film on sapphire through tuning substrate environment and its application for high-sensitive strain sensor.
- Authors
Yang, Weihuang; Mu, Yuanbin; Chen, Xiangshuo; Jin, Ningjing; Song, Jiahao; Chen, Jiajun; Dong, Linxi; Liu, Chaoran; Xuan, Weipeng; Zhou, Changjie; Cong, Chunxiao; Shang, Jingzhi; He, Silin; Wang, Gaofeng; Li, Jing
- Abstract
Large-area, continuous monolayer WS2 exhibits great potential for future micro-nanodevice applications due to its special electrical properties and mechanical flexibility. In this work, the front opening quartz boat is used to increase the amount of sulfur (S) vapor under the sapphire substrate, which is critical for achieving large-area films during the chemical vapor deposition processes. COMSOL simulations reveal that the front opening quartz boat will significantly introduce gas distribute under the sapphire substrate. Moreover, the gas velocity and height of substrate away from the tube bottom will also affect the substrate temperature. By carefully optimizing the gas velocity, temperature, and height of substrate away from the tube bottom, a large-scale continues monolayered WS2 film was achieved. Field-effect transistor based on the as-grown monolayer WS2 showed a mobility of 3.76 cm2V−1 s−1 and ON/OFF ratio of 106. In addition, a flexible WS2/PEN strain sensor with a gauge factor of 306 was fabricated, showing great potential for applications in wearable biosensors, health monitoring, and human–computer interaction.
- Subjects
STRAIN sensors; STRAIN gages; SAPPHIRES; CHEMICAL vapor deposition; MONOMOLECULAR films; FIELD-effect transistors; ORGANIC field-effect transistors
- Publication
Discover Nano, 2023, Vol 18, Issue 1, p1
- ISSN
2731-9229
- Publication type
Article
- DOI
10.1186/s11671-023-03782-z