Electronic transport mechanism in amorphous tetrahedrally-coordinated carbon films

J. P. Sullivan, T. A. Friedmann, R. G. Dunn, E. B. Stechel, P. A. Schultz, M. P. Siegal, N. Missert

Research output: Contribution to journalConference articlepeer-review

23 Citations (Scopus)


The electronic transport mechanism is tetrahedrally-coordinated amorphous carbon was investigated using measurements of stress relaxation, thermal evolution of electrical conductivity, and temperature-dependent conductivity measurements. Stress relaxation measurements were used to determine the change in 3-fold coordinated carbon concentration, and the electrical conductivity was correlated to this change. It was found that the conductivity was exponentially proportional to the change in 3-fold concentration, indicating a tunneling or hopping transport mechanism. It was also found that the activation energy for transport decreased with increasing anneal temperature. The decrease in activation energy was responsible for the observed increase in electrical conductivity. A model is described wherein the transport in this material is described by thermally activated conduction along 3-fold linkages or chains with variable range and variable orientation hopping. Thermal annealing leads to chain ripening and a reduction in the activation energy for transport.

Original languageEnglish
Pages (from-to)97-102
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Publication statusPublished - 1997
EventProceedings of the 1997 MRS Fall Symposium - Boston, MA, USA
Duration: Dec 1 1997Dec 2 1997

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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