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Interfacial electrical properties of diamond-like carbon/gallium arsenide heterostructures

Iyer, Suman B and Harshavardhan, KS and Kumar, Vikram (1993) Interfacial electrical properties of diamond-like carbon/gallium arsenide heterostructures. In: Diamond and Related Materials, 2 (12). pp. 1459-1463.

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Deposition onto GaAs of dielectric film with good interracial properties is difficult owing to the high surface state densities at the GaAs surface. Study of diamond-like carbon (DLC)/GaAs heterostructures is worthwhile because of the advantageous properties of insulating DLC film and the low temperatures involved in its preparation. In this paper, we compare the electrical interfacial properties of DLC/GaAs with those of DLC/Si and DLC/Ge structures. The DLC films were prepared by r.f. plasma-assisted chemical vapour deposition using a mixture of propane and n-butane. Capacitance measurements were taken in the frequency range 400 Hz to 1 MHz. The interface trap density distribution $N_{ss}(E)$ was estimated for the DLC-Si interface using Terman's method. Compared with the DLC-Si and DLC-Ge interfaces, the DLC-GaAs interface shows qualitatively different behaviour. There is an indication that the interfacial layer at the DLC-GaAs interface is more conducting than the DLC film, giving rise to Maxwell-Wagner type relaxation. As a result, the effective permittivity of the DLC film is one order of magnitude higher. The formation of this interracial layer could be related to pre-etching of the GaAs substrate using argon plasma.

Item Type: Journal Article
Publication: Diamond and Related Materials
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 13 Oct 2006
Last Modified: 19 Sep 2010 04:31
URI: http://eprints.iisc.ac.in/id/eprint/8365

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