Related Experiment Video
Updated: Oct 24, 2025
Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
Published on: December 5, 2015
The optical properties and carrier mobility of MH3 (M = Co, Rh and Ir) monolayers
Yang Yang1, Jimin Shang, Zijiong Li
1College of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Zhengzhou, China.
Abstract:
A new series of two-dimensional transition metal hydrides MH3 (M = Co, Rh, Ir) are investigated using first principles calculations. Their electronic structures, phonon dispersion, optical absorptions, and carrier mobilities are obtained and discussed. Our results on the basis of the Heyd-Scuseria-Ernzerhof (HSE) hybrid functional reveal that CoH3, RhH3 and IrH3 are indirect semiconductors with band gaps of 2.54 eV, 1.80 eV and 1.82 eV, respectively. Moreover, MH3 monolayers show strong optical absorption in the visible and near-ultraviolet light regions. Under tensile strain, the band gaps decrease and the optical absorption is enhanced in the visible region. The obtained carrier mobilities are found to be anisotropic along the armchair and zigzag directions. The holes along the armchair are more easily transferred with high mobility. The strong optical absorption intensity and the relatively high carrier mobilities make MH3 monolayers (especially RhH3 and IrH3) potential candidates for applications in photovoltaics.
Related Concept Videos
02:52Stereoisomerism
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
01:07Radicals: Electronic Structure and Geometry
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
03:02Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
01:16IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration
According to Hooke's law, the vibrational frequency is directly proportional to...
02:24Properties of Enantiomers and Optical Activity