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Type: Artigo de periódico
Title: Photoinduced Effects In Diamondlike Hydrogenated Amorphous Carbon Films
Author: Koropecki R.R.
Tessler L.R.
Sanjurjo J.A.
Alvarez F.
Abstract: Light exposure effects in glow discharge diamond-like a-C:H are reported. Sub gap photoluminescence (PL) shows a broad peak centered at 2.4eV. The PL efficiency at the peak energy decays under illumination as a power-law function of the time. This fatigue effect is recovered by exposure to white light or to a nitrogen laser. Photo-darkening and bleaching effects were also detected. All these effects can be cycled many times, and depend both on the light irradiation history of the samples and on the photon energy. Photobleaching, darkening and PL fatigue-recovery effects are similar to those reported for chalcogenide semiconductor glasses. Probably photoinduced switching between the many different structural configurations of similar energy possible in a-C:H is responsible for these effects. However, a definite model cannot be proposed from the available experimental data. © 1991 Elsevier Science Publishers B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S0022-3093(05)80249-2
Date Issue: 1991
Appears in Collections:Unicamp - Artigos e Outros Documentos

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