CUED Publications database

Optical and electronic properties of amorphous diamond

Veerasamy, VS and Amaratunga, GAJ and Milne, WI and Hewitt, P and Fallon, PJ and McKenzie, DR and Davis, CA (1993) Optical and electronic properties of amorphous diamond. Diamond and Related Materials, 2. pp. 782-787. ISSN 0925-9635

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The optical and electronic properties of highly tetrahedral amorphous diamond-like carbon (amorphous diamond, a-D) films were investigated. The structure of the films grown on silicon and glass substrates, under similar deposition conditions using a compact filtered cathodic vacuum arc system, are compared using electron energy loss spectroscopy (EELS). Results from hydrogenation of the films are also reported. The hydrogenated films show two prominent IR absorption peaks centered at 2920 and 2840 cm , which are assigned to the stretch mode of the C-H bond in the sp configuration on the C-H and C-H sites respectively. The high loss EELS spectra show no reduction in the high sp content in the hydrogenated films. UV and visible transmission spectra of a-D thin films are also presented. The optical band gap of 2.0-2.2 eV for the a-D films is found to be consistent with the electronic bandgap. The relationship between the intrinsic compressive stress in the films and the refractive index is also presented. The space charge limited current flow is analyzed and coupled with the optical absorption data to give an estimate of 10 cm eV for the valence band edge density of states. -1 3 3 18 -3 -1 3

Item Type: Article
Divisions: Div B > Electronics, Power & Energy Conversion
Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:52
Last Modified: 13 Apr 2021 07:32