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Carrier mobility tuning of MoS2 by strain engineering in CVD growth process
- Source :
- Nano Research.
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- Strain engineering is proposed to be an effective technology to tune the properties of two-dimensional (2D) transition metal dichalcogenides (TMDCs). Conventional strain engineering techniques (e.g., mechanical bending, heating) cannot conserve strain due to their dependence on external action, which thereby limits the application in electronics. In addition, the theoretically predicted strain-induced tuning of electrical performance of TMDCs has not been experimentally proved yet. Here, a facile but effective approach is proposed to retain and tune the biaxial tensile strain in monolayer MoS2 by adjusting the process of the chemical vapor deposition (CVD). To prove the feasibility of this method, the strain formation model of CVD grown MoS2 is proposed which is supported by the calculated strain dependence of band gap via the density functional theory (DFT). Next, the electrical properties tuning of strained monolayer MoS2 is demonstrated in experiment, where the carrier mobility of MoS2 was increased by two orders (∼ 0.15 to ∼ 23 cm2·V−1·s−1). The proposed pathway of strain preservation and regulation will open up the optics application of strain engineering and the fabrication of high performance electronic devices in 2D materials.
- Subjects :
- Electron mobility
Materials science
Fabrication
Strain (chemistry)
Band gap
business.industry
02 engineering and technology
Chemical vapor deposition
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Atomic and Molecular Physics, and Optics
0104 chemical sciences
Strain engineering
Monolayer
Optoelectronics
General Materials Science
Density functional theory
Electrical and Electronic Engineering
0210 nano-technology
business
Subjects
Details
- ISSN :
- 19980000 and 19980124
- Database :
- OpenAIRE
- Journal :
- Nano Research
- Accession number :
- edsair.doi...........890ea95795b44bfee14dd27c4c1181af