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(Color online) A schematic of charge distribution of a graded channel in AlGaN/GaN HEMT.
(Color online) Epitaxial structure of the (a) graded channel HEMT and (b) conventional HEMT.
(Color online) (a) Energy band diagram of the graded channel HEMT. (b) Simulated electron density profiles and the conduction band profiles in quantum well. (c) Two sub-bands occupied and the profile of the wave-functions. (d) Measured C-V profiles of graded channel HEMT and conventional HEMT.
DC I-V characteristics of (a) the graded channel HEMT and (b) the conventional HEMT after gate recess.
(Color online) (a) gm vs. Vgs and (b) gmi vs. Vgc for the graded channel HEMT and the conventional HEMT at Vds = 10 V.
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