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- W2963875265 abstract "Raman spectroscopy and sheet resistance measurements were used to study the preparation processes of low-resistance p-type 4H-SiC by Al ion implantation with ion doses of 2.45×10 1 2 - 9.0×10 1 4 cm -2 and annealing treatment with temperatures of 1700 - 1900 °C. Greatly different from the LOPC (longitudinal optical phonon-plasmon coupled) Raman mode found from the sample of doping 4H-SiC during epitaxial growth, no significant influence on the surface concentration could be found for the longitudinal optical (LO) mode of Al-implanted 4H-SiC samples. When the Al surface concentration is larger than around 10 18 cm -3 , it was found that the intensity of the LO+ Raman peak (~ 980 - 1000 cm -1 ) increases and its full width at half maximum (FWHM) drops with the increase of surface concentration after annealing treatment. Moreover, for surface concentrations above 10 1 8 cm - 3 , the LO+ Raman peak showed a left shift towards the LO peak, which could be related to the increase of free carrier concentration in the Al-implanted 4H-SiC samples. After higher annealing temperatures of 1800 °C and 1900 °C, the crystallinity of Al-implanted 4H-SiC was found to be improved compared to annealing at 1700 °C for surface concentrations larger than 10 18 cm -3 , which is consistent with the results of sheet resistance measurements." @default.
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- W2963875265 date "2019-07-01" @default.
- W2963875265 modified "2023-09-27" @default.
- W2963875265 title "Raman Spectroscopy Characterization of Ion Implanted 4H-SiC" @default.
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- W2963875265 doi "https://doi.org/10.4028/www.scientific.net/msf.963.424" @default.
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