Related Experiment Video
Updated: Feb 14, 2026
10:41
Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol
Published on: December 20, 2016
14.5K
Bandgap Tunability of Transition Metal Dichalcogenide Atomic Layers
Quinton Rice1, Bagher Tabibi1, Felix Jaetae Seo1
1Advanced Center for Laser Science and Spectroscopy, Hampton University, Hampton, Virginia, 23668, USA.
Journal of Nanoscience and Nanotechnology
|February 17, 2018
Summary
Controlling the bandgap of transition metal dichalcogenides (TMDCs) is possible by managing electron-phonon interactions and acoustic phonon energy. This study analyzes TMDC bandgap tunability with varying coupling strengths and phonon energies.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Transition metal dichalcogenides (TMDCs) exhibit temperature-dependent bandgaps crucial for electronic applications.
- Understanding the factors influencing bandgap tunability is key for material design.
Purpose of the Study:
- To analyze the temperature-dependent bandgap of TMDCs (MX2; M = Mo or W; X = S, Se, or Te).
- To investigate the influence of electron-phonon coupling strength and average acoustic phonon energy on bandgap tunability.
Main Methods:
- Utilized the O'Donnell and Chen relation to model bandgap behavior.
- Examined the impact of varying electron-phonon coupling strengths (s = 2 and s = 30) and acoustic phonon energies.
Main Results:
- Wider bandgap tunability is achieved with stronger electron-phonon coupling and larger acoustic phonon energy.
- Observed a significant 1.5 eV bandgap change under different coupling strengths.
- Identified distinct temperature dependencies for bandgap decrease based on coupling strength.
Conclusions:
- Electron-phonon interaction and average acoustic phonon energy are critical parameters for controlling TMDC bandgaps.
- The findings provide insights for designing TMDCs with tailored optoelectronic properties.
Related Concept Videos
02:58Properties of Transition Metals
30.1K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
30.1K
02:37Metallic Solids
20.9K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.9K
02:32Bonding in Metals
53.0K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
53.0K
03:06Alkali Metals
25.0K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
25.0K
02:51Metal-Ligand Bonds
24.5K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.5K
03:08Atomic Radii and Effective Nuclear Charge
62.4K
The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
62.4K