期刊
APPLIED PHYSICS LETTERS
卷 78, 期 15, 页码 2178-2180出版社
AMER INST PHYSICS
DOI: 10.1063/1.1361273
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Schottky barrier diodes, on both Ga and N faces of a similar to 300-mum-thick free-standing GaN layer, grown by hydride vapor phase epitaxy (HVPE) on Al2O3 followed by laser separation, were studied by capacitance-voltage and deep level transient spectroscopy (DLTS) measurements. From a 1/C-2 vs V analysis, the barrier heights of Ni/Au Schottky contacts were determined to be different for the two polar faces: 1.27 eV for the Ga face, and 0.75 eV for the N face. In addition to the four common DLTS traps observed previously in other epitaxial GaN including HVPE-grown GaN a new trap B-' with activation energy E-T=0.53 eV was found in the Ga-face sample. Also, trap E-1 (E-T=0.18 eV), believed to be related to the N vacancy, was found in the N-face sample, and trap C (E-T=0.35 eV) was in the Ga-face sample. Trap C may have arisen from reactive-ion-etching damage. (C) 2001 American Institute of Physics.
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