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Improvement of electrical and optical properties of p-GaN Ohmic metals under ultraviolet light irradiation annealing processes

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5 Author(s)
Chae, S.W. ; Department of Electronics Engineering, Korea University, Seoul 136-701, Korea and LM Development Team, Samsung Electro-Mechanics Co., Suwon 443-743, Korea ; Yoon, S.K. ; Kwak, J.S. ; Park, Y.H.
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We report the improvement of electrical and optical properties of p-GaN Ohmic metals, ZnNi(10 nm)/Au(10 nm), by ultraviolet (UV) light irradiation. After UV light irradiation, the specific contact resistance of p-GaN decreased slightly from 2.99×10-4 to 2.54×10-4 Ω cm2, while the transmittance of the contact layer increased form 75% to 85% at a wavelength of 460 nm. In addition, the forward voltage of InGaN/GaN light-emitting diode chip at 20 mA decreased from 3.55 to 3.45 V, and the output power increased form 18 to 25 mW by UV light irradiation. The low resistance and high transmittance of the p-GaN Ohmic metals are attributed to the reduced Shottky barrier by the formation of gallium oxide and the increased oxidation of p-Ohmic metals, respectively, due to ozone generated form oxygen during UV light irradiation.

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Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films  (Volume:24 ,  Issue: 3 )