Temperature dependence of strain-phonon coefficient in epitaxial Ge/Si(001): A comprehensive analysis
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Contributors
Abstract
We investigate the temperature dependence of the Ge Raman mode strain-phonon coefficient in Ge/Si heteroepitaxial layers. By analyzing the temperature-dependent evolution of both the Raman Ge& x2500;Ge line and of the Ge lattice strain, we obtain a linear dependence of the strain-phonon coefficient as a function of temperature. Our findings provide an efficient method for capturing the temperature-dependent strain relaxation mechanism in heteroepitaxial systems. Furthermore, we show that the rather large variability reported in the literature for the strain-phonon coefficient values might be due to the local heating of the sample due to the excitation laser used in mu-Raman experiments.
Details
Original language | English |
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Pages (from-to) | 989-996 |
Number of pages | 8 |
Journal | Journal of Raman spectroscopy |
Volume | 51 |
Issue number | 6 |
Publication status | Published - Jun 2020 |
Peer-reviewed | Yes |
Externally published | Yes |
External IDs
Scopus | 85080031546 |
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ORCID | /0000-0002-4217-0951/work/142237403 |
Keywords
Keywords
- Germanium, temperature-dependent, strain, phonon coefficient, epitaxial layers, HR-XRD, RAMAN FREQUENCIES, GE, SI, CRYSTALS, DIAMOND, SILICON, SCATTERING, MOBILITY, SHIFT