Observation of surface polarity dependent phonons in SiC by deep ultraviolet Raman spectroscopy

Nakashima  S; Mitani  T; Tomita  TKato  TNishizawa  SOkumura  HHarima  H

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Observation of surface polarity dependent phonons in SiC by deep ultraviolet Raman spectroscopy

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摘要

Backscattering Raman spectra of SiC polytype crystals with SiC{0001} polar faces have been measured using deep ultraviolet (DUV), UV, and visible (VIS) excitation sources. We have found that for DUV excitation the intensity profiles of zone-folded modes differ markedly for Si and C faces. This Raman spectral feature is attributed to the presence of nonpropagating phonon modes confined in the near-surface region. It is concluded that the surface-bound phonon modes created with DUV photon field extend over a region a few hundred nanometers in depth, and that the displacements of the phonon modes are anisotropic in the direction of the polar axis. This surface-orientation-dependent Raman spectrum can be used to identify the surface polarity of SiC polytypes.

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《Physical review, B. Condensed matter and materials physics》 |2007年第11期|5321-1-5321-5-0|共5页
作者
Nakashima S; Mitani T; Tomita TKato TNishizawa SOkumura HHarima H;
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作者单位

Univ Tokushima, Dept Ecosyst Engn, Tokushima 7708506, Japan;

Kyoto Inst Technol, Dept Elect & Informat Sci, Kyoto 6068585, Japan;

Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan;

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原文格式 PDF
正文语种英语
中图分类固体物理学;
关键词
CRYSTAL LATTICES; FOLDED MODES; LO PHONONS; SCATTERING; VIBRATION; SUPERLATTICES; POLYTYPES; INTENSITY; GAAS; BULK;

Observation of surface polarity dependent phonons in SiC by deep ultraviolet Raman spectroscopy

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