TITLE

Nonuniform current distribution in metal/diamond/metal vertical structures

AUTHOR(S)
Conte, G.; Rossi, M. C.; Salvatori, S.; Tersigni, F.; Ascarelli, P.; Cappelli, E.
PUB. DATE
June 2003
SOURCE
Applied Physics Letters;6/23/2003, Vol. 82 Issue 25, p4459
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The role of grain boundaries (GBs) in undoped polycrystalline diamond films has been investigated by dc and ac electrical measurements in a wide temperature range. Hopping transport along GB percolating paths and field-assisted thermal ionization of trapped charges are observed at low and high electric field strength, respectively. The temperature dependence of the ac conductivity, which reduces to a universal curve according to a random free-energy barrier model, suggests that, at low field strengths, current flow is mainly confined into GB domains in a wide temperature range. Only in the high-temperature and high-field ranges, do crystalline diamond grains become involved in current transport.
ACCESSION #
10024441

 

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