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Field Effect Modulation of Heterogeneous Charge Transfer Kinetics at Back-Gated Two-Dimensional MoS2 Electrodes
- Source :
- Nano Letters. 17:7586-7592
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- The ability to improve and to modulate the heterogeneous charge transfer kinetics of two-dimensional (2D) semiconductors, such as MoS2, is a major challenge for electrochemical and photoelectrochemical applications of these materials. Here we report a continuous and reversible physical method for modulating the heterogeneous charge transfer kinetics at a monolayer MoS2 working electrode supported on a SiO2/p-Si substrate. The heavily doped p-Si substrate serves as a back gate electrode; application of a gate voltage (VBG) to p-Si tunes the electron occupation in the MoS2 conduction band and shifts the conduction band edge position relative to redox species dissolved in electrolyte in contact with the front side of the MoS2. The gate modulation of both charge density and energy band alignment impacts charge transfer kinetics as measured by cyclic voltammetry (CV). Specifically, cyclic voltammograms combined with numerical simulations suggest that the standard heterogeneous charge transfer rate constant (k0...
- Subjects :
- Working electrode
Chemistry
Mechanical Engineering
Doping
Electrochemical kinetics
Analytical chemistry
Field effect
Charge density
Bioengineering
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
Chemical physics
Charge transfer coefficient
Electrode
General Materials Science
Cyclic voltammetry
0210 nano-technology
Subjects
Details
- ISSN :
- 15306992 and 15306984
- Volume :
- 17
- Database :
- OpenAIRE
- Journal :
- Nano Letters
- Accession number :
- edsair.doi...........4f4e5309b99def4e0b4dde6bf8467336