The correlation between surface conductivity and adsorbate coverage on diamond as studied by infrared spectroscopy

Ristein J, Ley L (2001)

Publication Type: Journal article

Publication year: 2001

Journal

Diamond and Related Materials Elsevier

Publisher: Elsevier

Book Volume: 10

Pages Range: 429

DOI: 10.1016/S0925-9635(00)00601-4

Abstract

A high-resolution analysis of C-H vibrational modes on a single crystal diamond(100) surface using Fourier-transform infrared (FTIR) spectroscopy in combination with conductivity measurements is reported. On a plasma-hydrogenated diamond(100) surface, the IR spectra measured in the multiple internal reflection mode reveal three absorption lines. Two of them at 2921 and 2854 cm-1 vanish in air at an annealing temperature of 190°C and are assigned to the antisymmetric and symmetric CH2 stretching modes of a physisorbed hydrocarbon species, respectively. The third band at 2897 cm-1 has a width of 16 cm-1, is stable up to 230°C and is associated with the stretching frequency of C2H2 monohydride units on the C(100) 2 × 1:2H surface. Upon annealing in air at temperatures lower than 200°C, the surface conductivity is reversibly reduced by up to five orders of magnitude. After cooling down to room temperature, it recovers the value of 1 × 10-5 Ω-1 measured immediately after the plasma hydrogenation with a time constant of several days. Annealing at 230°C destroys the surface conductivity irreversibly and yields conductance values below the measurement limit of 5 × 10-12 Ω-1. We show that the chemisorbed hydrogen in the C2H2 configuration, together with at least one physisorbed species, is responsible for the surface conductivity of hydrogen-terminated diamond(100). © 2001 Elsevier Science B.V. All rights reserved.

Authors with CRIS profile

Jürgen Ristein Lehrstuhl für Laserphysik Lothar Ley Naturwissenschaftliche Fakultät

How to cite

APA:

Ristein, J., & Ley, L. (2001). The correlation between surface conductivity and adsorbate coverage on diamond as studied by infrared spectroscopy. Diamond and Related Materials, 10, 429. https://doi.org/10.1016/S0925-9635(00)00601-4

MLA:

Ristein, Jürgen, and Lothar Ley. "The correlation between surface conductivity and adsorbate coverage on diamond as studied by infrared spectroscopy." Diamond and Related Materials 10 (2001): 429.

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