Structure Dependent Ultrafast Relaxation Time of Photo-excited Carriers in SiC
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- Tomita Takuro
- Institute for Solid State Physics, University of Tokyo
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- Saito Shingo
- Institute for Solid State Physics, University of Tokyo
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- Suemoto Tohru
- Institute for Solid State Physics, University of Tokyo
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- Harima Hiroshi
- Faculty of Engineering and Design, Kyoto Institute of Technology
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- Nakashima Shin-ichi
- National Institute of Advanced Industrial Science and Technology, FED, Advanced Power Device Laboratories
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Abstract
The ultrafast inter-conduction band carrier dynamics in 6H-SiC and 4H-SiC was observed by using the pump and probe transient absorption technique. The observed decay times of transmission changes are 1.25 ps for 6H-SiC and 630 fs for 4H-SiC, respectively. Dependence of the transmission change on probe wavelength and polarization were analyzed by using the steady-state absorption profiles. From this analysis, the transmission change was ascribed to the decrease of electron population in the lowest conduction band. The experimental results show that the decay of the transmission change was dominated by the inter-band electron phonon scattering. The inter-band deformation potential in 4H-SiC, deduced from the observed decay time, was 1.25 times larger than that in 6H-SiC. This polytype dependence of inter-band deformation potential is discussed in terms of the hexagonality and band-gap energies.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 73 (9), 2554-2561, 2004
THE PHYSICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390001204188444032
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- NII Article ID
- 110001955016
- 210000105042
- 130004538882
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- NII Book ID
- AA00704814
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- BIBCODE
- 2004JPSJ...73.2554T
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- ISSN
- 13474073
- 00319015
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- NDL BIB ID
- 7081193
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed