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A systematic study on the morphology and electronic properties of thin heavily boron-doped nanocrystalline diamond (NCD)films is presented. The films have nominally the same thickness ( 150nm) and are grown with a fixed B/C ratio (5000ppm) but with different C/H ratios (0.5-5%) in the gas phase. The morphology of the films is investigated by x-ray diffraction and atomic force microscopy measurements, which confirm that lower C/H ratios lead to a larger average grain size. Magnetotransport measurements reveal a decrease in resistivity and a large increase in mobility, approaching the values obtained for single-crystal diamond as the average grain size of the films increases. In all films, the temperature dependence of resistivity decreases with larger grains and the charge carrier density and mobility are thermally activated. It is possible

new journal of physics

Separation of intra- and intergranular magnetotransport properties in nanocrystalline diamond films on the metallic side of the metal–insulator transition