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NCUEIR > College of Science > Graduate Institute of Photonics Technologies > Periodical Articles > Item 987654321/17365

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/17365

Title:	Investigation of Oxidation Mechanism for Ohmic Formation in Ni/Au Contacts to p-type GaN Layers
Authors:	Lee, Chi-Sen;Lin, Yow-Jon;Lee, Ching-Ting
Contributors:	光電科技研究所
Keywords:	Nickel;Gold;Oxidation;Ohmic contacts;Contact resistance;Gallium compounds;Surface treatment;Semiconductor-metal boundaries,III-V semiconductors;Wide band gap semiconductors;X-ray photoelectron spectra
Date:	2001-12
Issue Date:	2013-10-02T08:35:47Z
Publisher:	American Institute of Physics
Abstract:	To investigate the function and mechanisms of oxidation, we present the ohmic performances for Ni/Au contacts to p-type GaN treated with various conditions. When the p-type GaN sample was preoxidized at 750 °C for 30 min in air ambient and then treated with (NH4)2Sx solution, we routinely obtained a specific contact resistance of 4.5×10−6 Ω cm2 for the Ni/Au contacts to samples alloyed at 500 °C for 10 min in air ambient. The fact that, in this configuration, ohmic performance improved one order of magnitude [compared with (NH4)2Sx surface treatment], is attributable to the strengthened formation of GaOx (aided by the preoxidation process), as well as the fact that more holes were induced on the oxidation-free p-type GaN surface.
Relation:	Applied Physics Letters, 79(23): 3815-3817
Appears in Collections:	[Graduate Institute of Photonics Technologies] Periodical Articles

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