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(a) and states introduced by bonded carbon atoms, dangling bond (db) states, as well as disorder induced band tailing dominate the band structure of undoped nanocrystalline diamond, states refer to distorted tetrahedrally bonded carbon atoms in the grain boundary. (b) Absorption coefficient measured with PDS for samples R0, R5, and AAu.
Spectrally resolved photoconductivity of samples R0 and AAu, measured as grown (solid lines) and after oxidation (dashed lines). The absorption of surface states in the case of the as-grown sample masks the onset at higher energies, attributed to transitions from the valence band tail to the conduction band tail.
(a) Temperature dependence of the spectrally resolved photoconductivity of sample AAu. The onset of the quenching of the photoconductivity is shifted to lower energies with increasing temperature. The intensity of photoconductivity at higher energies increases with temperature. (b) Schematic diagram of the density of states, assuming an exponential conduction bandtail.
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