Threshold voltage controlled by gate area and gate recess in inverted trapezoidal trigate AlGaN/GaN MOS high-electron-mobility transistors with photoenhanced chemical and plasma-enhanced atomic layer deposition oxides

Po Chun Yeh, Yun Wei Lin, Yue Lin Huang, Jui Hung Hung, Bo Ren Lin, Lucas Yang, Cheng Han Wu, Tzu Kuan Wu, Chao Hsin Wu, Lung Han Peng

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

An enhancement-mode AlGaN/GaN inverted-trapezoid trigate MOS high-electron-mobility transistor (HEMT), featuring double-layer oxides formed by photoenhanced chemical oxidation and plasma-enhanced atomic layer deposition (PEALD) oxide deposition, was shown to support the threshold voltage (Vth) with linear slopes of 0.36 V/nm and -0.32 V/μm2 scaled with recess depth and device area, respectively. The proposed device exhibited Vth of 1.2 V, current on/off ratio of 108, and fT/fmax of 9/36 GHz at a gate length/width of 250/360 nm. These observations can be ascribed to the combined effects of (a) an interfacial negative space charge of 3.2 μC/cm2 in the gate-recessed device that partially compensates for the spontaneous charge and (b) side-wall passivation that preserves the high-mobility channel.

Original languageEnglish
Article number084101
JournalApplied Physics Express
Volume8
Issue number8
DOIs
Publication statusPublished - 2015 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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