Gate Length Scaling Effect on High-Electron Mobility Transistors Devices Using AlGaN/GaN and AlInN/AlN/GaN Heterostructures
Compared to AlGaN/GaN HEMT with 0.15 μm T-gate length, the AlInN/AlN/GaN one exhibits much higher current density and transconductance of 1558 mA/mm at Vd
= 2 V and 330 mS/mm, respectively. The high extrinsic ft
and f
max
of 82 GHz and 70 GHz are extracted from AlInN/AlN/GaN HEMT. Besides, we find that the transconductance roll-off is significant in AlGaN/GaN, but largely improved in AlInN/AlN/GaN HEMT, suggesting that the high carrier density and lattice-matched epitaxial heterostructure is important to reach
both large RF output power and high operation frequency, especially for an aggressively gate length scaling.
Document Type: Research Article
Publication date: 01 August 2014
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