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

A set of MPCVD films was prepared from 0.5% CH(4)/H(2) and B(2)H(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 hand, diamond second order, CH, bands appear. The evolution of these bands with increasing B/C is reported and discussed. (c) 2006 Elsevier B.V. All rights reserved.