Back to Search
Start Over
Structural and optical properties of single- and few-layer magnetic semiconductor CrPS4
- Publication Year :
- 2020
-
Abstract
- Atomically thin binary 2-dimensional (2D) semiconductors exhibit diverse physical properties depending on their composition, structure and thickness. By adding another element in those materials, which will lead to formation of ternary 2D materials, the property and structure would greatly change and significantly expanded applications could be explored. In this work, we report structural and optical properties of atomically thin chromium thiophosphate (CrPS4), a ternary antiferromagnetic semiconductor. Its structural details were revealed by X-ray and electron diffractions. Transmission electron microscopy showed that preferentially-cleaved edges are parallel to diagonal Cr atom rows, which readily identified their crystallographic orientations. Strong in-plane optical anisotropy induced birefringence that also enabled efficient determination of crystallographic orientation using polarized microscopy. The lattice vibrations were probed by Raman spectroscopy for the first time and exhibited significant dependence on thickness of crystals exfoliated down to single layer. Optical absorption determined by reflectance contrast was dominated by d-d type transitions localized at Cr3+ ions, which was also responsible for the major photoluminescence peak at 1.31 eV. The spectral features in the absorption and emission spectra exhibited noticeable thickness-dependence and hinted a high photochemical activity for single layer CrPS4. The current structural and optical investigation will provide a firm basis for future study and application of this novel magnetic semiconductor.<br />Comment: 32 pages, 5 figures
- Subjects :
- Materials science
General Physics and Astronomy
02 engineering and technology
010402 general chemistry
01 natural sciences
Molecular physics
symbols.namesake
Physics - Chemical Physics
General Materials Science
Anisotropy
Polarized light microscopy
Condensed Matter - Materials Science
business.industry
General Engineering
Magnetic semiconductor
021001 nanoscience & nanotechnology
0104 chemical sciences
Crystallography
Semiconductor
Electron diffraction
Transmission electron microscopy
symbols
0210 nano-technology
Ternary operation
Raman spectroscopy
business
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....a7447082fe2c04699e0eb9fd58363e88