High-Temperature Optical Characterization of Transition Metal Dichalcogenides by Piezoreflectance Measurements
| Autor: | Leonid Kulyuk, Dumitru Dumcenco, Andrei Colev, Kwong Kau Tiong, C. Gherman, Ying-Sheng Huang |
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| Rok vydání: | 2012 |
| Předmět: |
Condensed Matter::Materials Science
Crystallography Range (particle radiation) Materials science Transition metal General Materials Science Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Molecular physics Atomic and Molecular Physics and Optics Spectral line Characterization (materials science) |
| Zdroj: | Solid State Phenomena. 194:158-161 |
| ISSN: | 1662-9779 |
| DOI: | 10.4028/www.scientific.net/ssp.194.158 |
| Popis: | A systematic optical characterization of transition metal dichalcogenide layered crystals grown by chemical vapour transport method as well as of natural molybdenite were carried out by using piezoreflectance (PzR) measurements. From a detailed lineshape fit of the room-temperature PzR spectra over an energy range from 1.6 to 5.0 eV, the energies of the band-edge excitonic and higher lying interband direct transitions were determined accurately. The possible assignments of the different origins of excitonic transitions are discussed. The near direct band edge A and B excitonic transitions detected in PzR spectra show a linear red-shift with the temperature increasing up to 525 K. The values of temperature-dependent energies of the excitonic transitions A and B are evaluated and discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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