Abstract
The quaternary InAlGaN-barrier GaN MOS-HEMT (high-electron-mobility transistor) with enhancement mode operation was displayed as Vth=0.65V and the maximum drain current ~ 40 mA/mm at VDS=10V with LG=15μm and LGD=20μm. The measured rocking-curve and RSM (reciprocal space mapping) for epitaxial quality was confirmed the composition of the quaternary and analyzed the relaxation between InAlGaN-barrier and GaN Buffer layer. The surface roughness of InAlGaN was observed by AFM (Atomic force microscopy). The positive polarity of Vth was obtained with the gate lengths 3-30μm, and short channel effect was discussed.
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