Related Experiment Video
Updated: Jan 5, 2026
10:36
Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
11.9K
Electric Field Controlled Indirect-Direct-Indirect Band Gap Transition in Monolayer InSe
Xian-Bo Xiao1, Qian Ye2, Zheng-Fang Liu3
1School of Computer Science, Jiangxi University of Traditional Chinese Medicine, Nanchang, 330004, China. 20101034@jxutcm.edu.cn.
Nanoscale Research Letters
|October 17, 2019
Summary
Applying an electric field to Indium Selenide (InSe) causes a semiconductor-to-metal transition. This transition is driven by changes in its electronic band structure, offering insights for optoelectronic device design.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Layered group III-VI semiconductors exhibit unique electronic properties.
- Understanding the impact of external stimuli on these properties is crucial for device applications.
Purpose of the Study:
- To investigate the electronic structure of monolayer Indium Selenide (InSe) under a perpendicular electric field.
- To explore the mechanisms behind observed electronic transitions and their implications.
Main Methods:
- Computational investigation of electronic band structures.
- Analysis of orbital contributions to energy bands.
- Tracking the evolution of band edges under varying electric field strengths.
Main Results:
- Monolayer InSe undergoes an indirect-direct-indirect band gap transition with increasing electric field.
- The global band gap of InSe is progressively reduced to zero.
- A semiconductor-to-metal transformation is observed in monolayer InSe.
Conclusions:
- The study reveals the electronic behavior of InSe under electric fields, including band gap closure and semiconductor-metal transition.
- Findings enhance the understanding of III-VI semiconductors and guide the development of novel optoelectronic devices.
More Related Videos
05:39Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
10.2K
10:35Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
Published on: September 26, 2014
12.7K
Related Concept Videos
01:22Semiconductors
1.3K
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...
1.3K
01:12Fermi Level Dynamics
614
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...
614
02:35Band Theory
16.9K
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,...
16.9K
01:24Metal-Semiconductor Junctions
852
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
852
01:01Energy Bands in Solids
1.8K
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...
1.8K
01:23Induced Electric Fields
4.5K
The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
4.5K