| Autor: |
K. Grodecki, K. Murawski, K. Michalczewski, B. Budner, P. Martyniuk |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
AIP Advances, Vol 9, Iss 2, Pp 025107-025107-4 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2158-3226 |
| DOI: |
10.1063/1.5081775 |
| Popis: |
The InAs1–xSbx ternary alloy band gap nonlinearly depends on the composition, which gives the opportunity to use this material in devices operating in a wide range of infrared radiation. We present experimental results for InAs1–xSbx samples for Sb composition from 0.1 to 0.8. Raman spectrum of InAs and InSb in the range of 20 - 250 cm-1 exhibits two main peaks: LO peak and 2TA peak. On the other hand in the same range for InAsSb in Raman spectra two additional peaks (round 44 cm-1 and round 130 cm-1) appear, while they are not existing neither in pure InAs nor in InSb. Energies of 44 cm-1 and 130 cm-1 are close to phonon energy for momentum equals K and L for InAs. This type of peaks are usually called DALA and DATA and it is commonly accepted that they come from disorder in crystal field. We propose other explanation-existence of zone folding in phonon dispersion curves as a result of CuPt unit cell of InAsSb being twice larger than typical ZB unit cell. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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