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Title: Enhancement of Schottky Barrier Height on p-type GaN by (NH4)2Sx Treatment
Authors: Lin, Yow-Jon;You, Chang-Feng;Lee, Chi-Sen
Contributors: 光電科技研究所
Keywords: Schottky barriers;Gallium compounds;III-V semiconductors;Wide band gap semiconductors;Nickel;Semiconductor-metal boundaries;X-ray photoelectron spectra;Deep levels;Defect states;Semiconductor doping;Thermionic emission;Surface treatment;Surface states;Vacancies (crystal)
Date: 2006-03
Issue Date: 2013-10-02T08:36:36Z
Publisher: American Institute of Physics
Abstract: Barrier height values of Ni contacts to (NH4)2Sx-treated p-type GaN (p-GaN) were obtained from current-voltage and x-ray photoelectron spectroscopy (XPS) measurements in this study. The induced deep level defect band through high Mg doping led to a reduction of the depletion layer width in the p-GaN near the interface and an increase in the probability of thermionic field emission (TFE). Furthermore, the calculated barrier height value of Ni contacts to (NH4)2Sx-treated p-GaN using the TFE model is close to the Schottky limit, which is in good agreement with the observed result by XPS measurements and suggests that (NH4)2Sx surface treatment leads to the removal of native oxides and the reduction of the surface state related to oxygen-induced and nitrogen-vacancy defects.
Relation: Journal of Applied Physics, 99(5): 053706
Appears in Collections:[光電科技研究所] 期刊論文

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