DC electrical properties of amorphous carbon with different bonding hybridization

S. H. Moustafa, M. Koós, I. Pócsik

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Temperature dependence of dc conductivity in hydrogenated amorphous carbon (a-C:H) samples, deposited in the range of -200 to -700 V self-bias voltages, was studied above room temperature from 300 K to 650 K. Because a non-Arrhenius dependence on 1/T was found, actual activation energy Eact was determined by derivation of the log σ versus T-1. This Eact increased gradually with temperature by a rate depending on self bias. Strong fluctuations of Eact, observed above 500 K, indicates a transition to another conduction mechanism. Below 500 K the plot of log σ versus T-1/4 could be fitted to linear functions, with an unrealistic density of states at Fermi energy, supporting, that underlying mechanism cannot be variable range hopping near EF rather it is related to conduction by hopping of carriers excited to band tails.

Original languageEnglish
Pages (from-to)1087-1091
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume227-230
Issue numberPART 2
DOIs
Publication statusPublished - May 1998

Keywords

  • Amorphous carbon
  • Bonding hybridization
  • DC electrical properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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