The electronic transport mechanism in amorphous tetrahedrally-coordinated carbon films | Zendy

J. P. Sullivan | Zendy; T. A. Friedmann | Zendy; R.G. Dunn | Zendy; Ellen B. Stechel | Zendy; Peter A. Schultz | Zendy

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The electronic transport mechanism in amorphous tetrahedrally-coordinated carbon films

Author(s) -

J. P. Sullivan,

T. A. Friedmann,

R.G. Dunn,

Ellen B. Stechel,

Peter A. Schultz

Publication year - 1998

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/634073

Subject(s) - activation energy , variable range hopping , electrical resistivity and conductivity , thermal conduction , annealing (glass) , materials science , amorphous solid , conductivity , relaxation (psychology) , quantum tunnelling , atmospheric temperature range , chemical physics , chemistry , thermodynamics , crystallography , composite material , optoelectronics , electrical engineering , engineering , psychology , social psychology , physics

The electronic transport mechanism in 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

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