Specific features of 325 nm Raman excitation of heavily boron doped polycrystalline diamond films

摘要

A set of MPCVD films was prepared from 0.5 percent CH_4/H_2 and B_2H_6 with B/C in the gas phase from 0 to 8000 ppm. When the excitation wavelength of their Raman spectra is switched from 632.8 to 325 nm: The Fano induced dip switches from high to low wave number side of the "1332 cm~(-1)" signal. The deformation and the downward shift of this signal decrease. The G band, diamond second order, CH_X bands appear. The evolution of these bands with increasing B/C is reported and discussed.