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Intriguing electronic properties of two-dimensional MoS2/TM2CO2(TM = Ti, Zr, or Hf) hetero-bilayers: type-II semiconductors with tunable band gaps
- Source :
- Nanotechnology. 26:135703
- Publication Year :
- 2015
- Publisher :
- IOP Publishing, 2015.
-
Abstract
- Two-dimensional (2D) transition metal compound (TMC) monolayers, as well as their van der Waals heterostructures with unique properties, are fundamentally and technologically intriguing. Here, heterostructures consisting of a MoS2 monolayer and TM2CO2 (TM = Ti, Zr or Hf) monolayers are systematically researched by means of the density functional theory (DFT). Different from semiconductor/metal contacts, MoS2 and TM2CO2 monolayers are all semiconductors with band gaps ranging from 0.25-1.67 eV. According to rigorous screening of stacking patterns, MoS2/Zr2CO2 is shown to be an indirect type-II semiconductor with the maximum valence and minimum conduction bands spatially separated on opposite monolayers. Simultaneously, the interface charges transfer from Zr2CO2 to MoS2 results in a built-in field that separates the electrons and holes efficiently. Also, the smaller effective masses of electrons and the holes of band edges indicate the higher carrier mobility. Moreover, strain regulation can make the hetero-bilayer's character a semiconductor-semimetal-metal transition. The physical insights pave the way for the good performance of MoS2/TM2CO2 in next-generation electronic devices and photocatalysts.
- Subjects :
- Electron mobility
Valence (chemistry)
Materials science
Condensed matter physics
business.industry
Band gap
Mechanical Engineering
Bioengineering
Nanotechnology
Heterojunction
General Chemistry
Semimetal
Semiconductor
Mechanics of Materials
Monolayer
General Materials Science
Density functional theory
Electrical and Electronic Engineering
business
Subjects
Details
- ISSN :
- 13616528 and 09574484
- Volume :
- 26
- Database :
- OpenAIRE
- Journal :
- Nanotechnology
- Accession number :
- edsair.doi.dedup.....dd8d0590a43c8bfaba4713b19dfa067b