Abnormal Raman Spectral Variation with Excitation Wavelength in Boron-Doped Single-Crystalline Diamond

Abstract:

The Raman spectra of boron-doped single-crystalline diamond were measured at excitation wavelengths between 364.0 and 1064.0 nm and found that the first-order Raman band at 1332 cm^-1 shifts to the low-frequency side, broadens, and develops a derivative-like lineshape as the boron concentration increases. The derivative-like lineshape can be explained by Fano interference. Furthermore, I found that the asymmetric lineshape changes between excitation wavelengths of 514.5 and 785.0 nm. From a comparison of the normalized relative Raman intensity as a function of the excitation energy and the density of states (DOS) in the valence band in the B-doped diamond calculated previously by the coherent potential approximation, the abnormal change in the Raman lineshape is attributed to a change in the DOS in the valence band at approximately 2.0 eV. Raman spectroscopy provides us with extensive information on carrier concentrations, and electronic band structures of B-doped diamond.

• Periodical: Materials Science Forum (Volume 858)
• Pages: 1158-1161
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.858.1158
• Online since: May 2016
• Authors: Masanobu Yoshikawa
• Keywords: Boron-Doped Single-Crystalline Diamond, Characterization, Fano Effect, Raman Spectroscopy

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