Article
Role of Near-Surface States in Ohmic-Schottky Conversion of Au Contacts to ZnO
Applied Physics Letters
Document Type
Article
Publication Date
6-1-2005
Disciplines
Abstract
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.
DOI
10.1063/1.1984089
Citation Information
H. L. Mosbacker, Y. M. Strzhemechny, B. D. White, P. E. Smith, et al.. "Role of Near-Surface States in Ohmic-Schottky Conversion of Au Contacts to ZnO" Applied Physics Letters Vol. 87 Iss. 1 (2005) ISSN: 0003-6951 Available at: http://works.bepress.com/david_look/126/
Copyright © 2005, American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters 87.1, and may be found at http://apl.aip.org/resource/1/applab/v87/i1/p012102_s1