Journal
JOURNAL OF APPLIED PHYSICS
Volume 94, Issue 6, Pages 4225-4227Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1604475
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We have investigated nonalloyed Al/Pt ohmic contacts on n-type ZnO:AI (n(d) = 2.0 x 10(18) cm(-3)). It is shown that the as-deposited Al/Pt contacts produce a specific contact resistivity of 1.2 x 10(-5) Omega cm(2). Auger electron spectroscopy and x-ray photoelectron spectroscopy depth profile results show interdiffusion between oxygen and aluminum, resulting in an increase of carrier concentrations near the ZnO surface. The increase of the carrier concentration at the surface region of ZnO is attributed to the low resistance of the nonalloyed Al/Pt contact. (C) 2003 American Institute of Physics.
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