Catalytic role of Au in Ni/Au contact on GaN(0001)

Kim, C. C.; Kim, J. K.; Lee, J.-L.; Je, J. H.; Yi, M. S.; Noh, D. Y.; Hwu, Y.; Ruterana, P.
June 2001
Applied Physics Letters;6/11/2001, Vol. 78 Issue 24, p3773
Academic Journal
We investigated the structural behavior of the Ni/Au contact on GaN(0001) and found the catalytic role of Au during annealing, using in situ x-ray scattering. The oxidation kinetics of Ni during annealing in air was greatly affected by the presence of Au. The accelerated GaN decomposition and Ni nitride formation during annealing in N[sub 2] also provide evidence of the catalytic role of Au. The results suggest that oxidized Ni/Au ohmic contact exhibit better thermal stability than that of the N[sub 2] annealed Ni/Au contacts. © 2001 American Institute of Physics.


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