By Satoshi Koizumi, Christoph Nebel, Milos Nesladek
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The position of the central zone phonon at 1332 cm−1 is marked by a dashed line. The Fano resonance is observable as a broad peak at about 1230 cm−1 and as a deformation of the zone-center phonon line. 1020 cm−3). The peak at 1230 cm−1, typical for heavily B-doped diamond with a Bconcentration above MIT was explained by a Fano resonance, for example, quantum interferences between the continuum of electronic excitations and a zone-center phonon . 5 is that sp2related Raman resonances in heavily B-doped ﬁlms are signiﬁcantly reduced and for the highest doping levels become almost invisible.
4 compares the Raman spectra for undoped UNCD and NCD ﬁlms with thicknesses of about 500 nm. In NCD ﬁlms the zone-center phonon line at 1332 cm−1 is clearly visible together with a graphitic peak at about 1500 cm−1. It should be noted that the Raman spectral shape also depends on the NCD thickness, that is, for very thin NCD layers in the range of 50 nm thickness, D and G peaks appear under red light excitation, related to disordered carbon present in a larger relative proportion than that for thicker ﬁlms.
The transmission spectra are modulated by an interference pattern, which gives the samples a characteristic color. Typically, the color of a “just coalesced” layer, that is, a layer with grain sizes equal to the ﬁlm thickness with nucleation density at about 1011 cm−2, and about 70 nm thick, is a blue. B-doping has a signiﬁcant inﬂuence on the absorption of NCD ﬁlms. When boron is incorporated in the diamond lattice it leads to a blue background color, independent of interference effects as discussed above.