Influence of substrate bias on the properties of a-C:H films prepared by plasma CVD

Journal article

Publication Details

Author(s): Hundhausen M, Ristein J, Ley L
Journal: Journal of Non-Crystalline Solids
Publisher: Elsevier
Publication year: 1993
Volume: 164-166
Pages range: 1127
ISSN: 0022-3093


We have measured photoluminescence (PL) and Raman spectra for a series of amorphous carbon (a-C:H) films prepared in a RF-plasma CVD system. The negative bias voltage was varied between 0V and 950V. The samples seem to consist of two components. One polymeric component has a high band gap and gives strong luminesence above 2.1 eV with 0.6 eV band width. The second component shows the Raman spectrum that is typical for the sp2-clusters of hard carbon. We find that the hard carbon component seems to be absent for zero bias voltage. The PL for this sample, however, is strongest. We find a fatiguing of the luminescence during laser excitation. This fatiguing is weaker at 120 K, resulting in a higher PL-efficiency for this temperature. © 1993.

FAU Authors / FAU Editors

Hundhausen, Martin apl. Prof. Dr.
Lehrstuhl für Laserphysik
Ley, Lothar Prof. Dr.
Naturwissenschaftliche Fakultät
Ristein, Jürgen apl. Prof. Dr.
Lehrstuhl für Laserphysik

Last updated on 2018-09-08 at 04:54