Details
| Original language | English |
|---|---|
| Article number | 107701 |
| Journal | NANO ENERGY |
| Volume | 102 |
| Early online date | 13 Aug 2022 |
| Publication status | Published - Nov 2022 |
Abstract
Molybdenum disulfide (MoS2), as a representative two-dimensional material, has distinctive physical and mechanical properties, especially in a bilayer form. Here, we conduct a study on the effect of out-of-plane flexoelectricity on a fabricated bilayer MoS2 Schottky contact via the Conductive Atomic Force Microscope (CAFM). The induced polarization in the sample under the tip force, which is entirely from the flexoelectric mechanism due to the absence of out-of-plane piezoelectricity in terms of the molybdenum-to-sulfur bond symmetry, changes the barrier height of the formed Schottky contact between the bilayer MoS2 and Au electrode. According to the Hertzian contact theory and the modified current equation of the classical thermionic emission theory, the relationship between the strain gradient and the effective barrier height ϕBp is quantitatively presented. The out-of-plane flexoelectric coefficients of the bilayer MoS2 are thus evaluated as f3333=0.4758 nC/m and f3113=f3223=0.2867 nC/m.
Keywords
- Bilayer, Conductive Atomic Force Microscope (CAFM), Flexoelectric coefficient, Flexoelectricity, Molybdenum disulfide
ASJC Scopus subject areas
- Energy(all)
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Electrical and Electronic Engineering
Sustainable Development Goals
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In: NANO ENERGY, Vol. 102, 107701, 11.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effect of flexoelectricity on a bilayer molybdenum disulfide Schottky contact
AU - Sun, Liang
AU - Javvaji, B.
AU - Zhang, Chunli
AU - Zhuang, Xiaoying
AU - Chen, Weiqiu
N1 - Funding Information: This work was supported by the Natural Science Foundation of Zhejiang province, China (No. LR21A020002 ), the National Natural Science Foundation of China (Nos. 12172326, 11972139 , and 12192210 ), the National Key Research and Development Program of China (Nos. 2020YFA0711700 and 2020YFA0711701 ).
PY - 2022/11
Y1 - 2022/11
N2 - Molybdenum disulfide (MoS2), as a representative two-dimensional material, has distinctive physical and mechanical properties, especially in a bilayer form. Here, we conduct a study on the effect of out-of-plane flexoelectricity on a fabricated bilayer MoS2 Schottky contact via the Conductive Atomic Force Microscope (CAFM). The induced polarization in the sample under the tip force, which is entirely from the flexoelectric mechanism due to the absence of out-of-plane piezoelectricity in terms of the molybdenum-to-sulfur bond symmetry, changes the barrier height of the formed Schottky contact between the bilayer MoS2 and Au electrode. According to the Hertzian contact theory and the modified current equation of the classical thermionic emission theory, the relationship between the strain gradient and the effective barrier height ϕBp is quantitatively presented. The out-of-plane flexoelectric coefficients of the bilayer MoS2 are thus evaluated as f3333=0.4758 nC/m and f3113=f3223=0.2867 nC/m.
AB - Molybdenum disulfide (MoS2), as a representative two-dimensional material, has distinctive physical and mechanical properties, especially in a bilayer form. Here, we conduct a study on the effect of out-of-plane flexoelectricity on a fabricated bilayer MoS2 Schottky contact via the Conductive Atomic Force Microscope (CAFM). The induced polarization in the sample under the tip force, which is entirely from the flexoelectric mechanism due to the absence of out-of-plane piezoelectricity in terms of the molybdenum-to-sulfur bond symmetry, changes the barrier height of the formed Schottky contact between the bilayer MoS2 and Au electrode. According to the Hertzian contact theory and the modified current equation of the classical thermionic emission theory, the relationship between the strain gradient and the effective barrier height ϕBp is quantitatively presented. The out-of-plane flexoelectric coefficients of the bilayer MoS2 are thus evaluated as f3333=0.4758 nC/m and f3113=f3223=0.2867 nC/m.
KW - Bilayer
KW - Conductive Atomic Force Microscope (CAFM)
KW - Flexoelectric coefficient
KW - Flexoelectricity
KW - Molybdenum disulfide
UR - http://www.scopus.com/inward/record.url?scp=85136126784&partnerID=8YFLogxK
U2 - 10.1016/j.nanoen.2022.107701
DO - 10.1016/j.nanoen.2022.107701
M3 - Article
AN - SCOPUS:85136126784
VL - 102
JO - NANO ENERGY
JF - NANO ENERGY
SN - 2211-2855
M1 - 107701
ER -