Role of near-surface states in ohmic-Schottky conversion of Au contacts to ZnO

Mosbacker, H. L.; Strzhemechny, Y. M.; White, B. D.; Smith, P. E.; Look, D. C.; Reynolds, D. C.; Litton, C. W.; Brillson, L. J.
July 2005
Applied Physics Letters;7/4/2005, Vol. 87 Issue 1, p012102
Academic Journal
A conversion from ohmic to rectifying behavior is observed for Au contacts on atomically ordered polar ZnO surfaces following remote, room-temperature oxygen plasma treatment. This transition is accompanied by reduction of the “green” deep level cathodoluminescence emission, suppression of the hydrogen donor-bound exciton photoluminescence and a ∼0.75 eV increase in n-type band bending observed via x-ray photoemission. These results demonstrate that the contact type conversion involves more than one mechanism, specifically, removal of the adsorbate-induced accumulation layer plus lowered tunneling due to reduction of near-surface donor density and defect-assisted hopping transport.


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