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• W1965744054 startingPage "1360" @default.
• W1965744054 abstract "Amorphous carbon (a-C:H) films were deposited from C2H2 in an r.f.-discharge reactor. By changing the area ratio of the two electrodes both anode-type (polymer-like) and cathode-type (diamond-like) films were obtained. They were characterized by their optical absorption constant α using photothermal deflection spectroscopy (PDS), photoluminescence (PL) and electron spin resonance (ESR). We define the optical gap as E03, the energy, where α = 103cm−1. The broad absorption edge is exponential with an Urbach energy E0 ≈ 250 meV independent of E03 and the deposition conditions. The ESR spectra of all films reveal a single line with g ≈ 2.0027 and lorentzian lineshape whose linewidth ΔHpp varies strongly with E03. The variation of both ΔHpp and the spin density Ns with E03 is different in anode- and cathode-type films. In spite of the high values of Ns (4 × 1018 −7 × 1020 cm−3), all films exhibit photoluminescence, whose intensity IPL increases by three orders of magnitude with increasing E03. Unlike in a-Si:H, there is no well defined correlation between IPL and Ns, indicating that the paramagnetic states are not the dominant centres for non-radiative recombination in a-C:H. These results are discussed in terms of the graphitic-cluster model in which the variation of the film properties can be related to the variation of cluster sizes." @default.
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• W1965744054 date "1993-08-01" @default.
• W1965744054 modified "2023-09-27" @default.
• W1965744054 title "Electronic properties of amorphous carbon (a-C:H)" @default.
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• W1965744054 doi "https://doi.org/10.1016/0925-9635(93)90185-5" @default.
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