Related Experiment Video
Updated: Apr 30, 2026
11:42
Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
14.7K
Tunable band gaps in silicene-MoS2 heterobilayers
1Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, and School of Materials Science and Engineering, Jilin University, Changchun, 130022, China. ljc@jlu.edu.cn jiangq@jlu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|May 10, 2014
Summary
Silicene-molybdenum disulfide (MoS2) heterobilayers preserve linear band dispersions and open a tunable band gap, making them promising for electronic and photonic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Silicene, a silicon analog of graphene, exhibits unique electronic properties.
- Molybdenum disulfide (MoS2) is a prominent two-dimensional transition metal dichalcogenide with diverse applications.
- Heterobilayers combining different 2D materials offer novel functionalities.
Purpose of the Study:
- To investigate the structural and electronic properties of silicene/MoS2 heterobilayers.
- To understand the influence of interface interactions on electronic band structure.
- To explore the potential of these heterobilayers in electronic and photonic devices.
Main Methods:
- Systematic study using density functional theory (DFT).
- Inclusion of van der Waals (vdW) corrections to account for weak interactions.
- Analysis of geometric and electronic properties, including band dispersion and band gap.
Main Results:
- Weak interface interactions preserve the nearly linear band dispersions of silicene.
- An intrinsic interface dipole breaks sublattice symmetry, opening a band gap.
- The band gap is effectively tunable via an external electric field.
Conclusions:
- Silicene-MoS2 heterobilayers exhibit tunable electronic properties.
- These materials are promising candidates for future logic circuits.
- Potential applications in advanced photonic devices are indicated.
Related Concept Videos
01:22Semiconductors
1.8K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
1.8K
01:01Energy Bands in Solids
2.4K
Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
2.4K
02:35Band Theory
14.6K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
14.6K
01:27Biasing of Metal-Semiconductor Junctions
907
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
907
01:12Fermi Level Dynamics
1.1K
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
1.1K
01:22MOSFET: Enhancement Mode
1.1K
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
1.1K