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Low resistance and transparent Ni–La solid solution/Au ohmic contacts to p-type GaN

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7 Author(s)
June-o Song ; Department of Materials Science and Engineering, Kwangju Institute of Science and Technology (KJIST), Kwangju 500-712, Korea ; Leem, Dong-Seok ; Kwak, J.S. ; Lee, S.N.
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We report on the formation of reliable Ni–La solid solution (8 nm)/Au (8 nm) ohmic contacts to p-type GaN (Na=5×1017cm-3). The as-deposited contact reveals nonlinear current–voltage (I–V) characteristics. However, the contacts show considerably improved I–V behavior when annealed at temperatures of 350–550 °C for 1 min in air ambient. For example, the specific contact resistance as low as 7.2×10-5 Ω cm2 is obtained from the samples annealed at 550 °C, whose transmittance is measured to be 82.5% at a wavelength of 470 nm. Based on Auger electron spectroscopy and x-ray photoemission spectroscopy results, possible ohmic formation mechanisms for the annealed contacts are described and discussed. © 2004 American Institute of Physics.

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Applied Physics Letters  (Volume:84 ,  Issue: 9 )