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• W2029553851 abstract "Raman spectra of three bulk 4H-SiC wafers with different free carrier concentration were measured at temperature from 80 K to 873 K. As temperature increases, Raman peaks of most optical phonon modes show monotonous down shift. An anomalous non-monotonous variation with temperature, was observed in the A(1) longitudinal optical (LO) mode from doped samples. Two methods of theoretical fitting, one-mode (LO-plasma coupled (LOPC) mode) and two-mode (A(1)(LO) + LOPC) fitting, are employed to analyze this anomalous phenomenon. Theoretical simulations for temperature dependent Raman spectra by using two methods are critically examined. It turns out that one-mode method conforms well the experimental results, while two-mode method is untenable in physics. The non-monotonous variation of blue-red shifts with temperature for LOPC mode from doped 4H-SiC could be explained by the influence from ionization process of impurities on the process of Raman scattering. A quantitative description on temperature dependent Raman spectra for doped 4H-SiC is achieved, which matches well to experimental data." @default.
• W2029553851 created "2016-06-24" @default.
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• W2029553851 date "2013-10-28" @default.
• W2029553851 modified "2023-10-05" @default.
• W2029553851 title "Temperature dependence of Raman scattering in bulk 4H-SiC with different carrier concentration" @default.
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• W2029553851 doi "https://doi.org/10.1364/oe.21.026475" @default.
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