Journal
IEEE ELECTRON DEVICE LETTERS
Volume 36, Issue 3, Pages 232-234Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2015.2395454
Keywords
HEMT; enhancement mode; threshold voltage
Categories
Funding
- Bureau of Energy, Taiwan's Ministry of Economics Affairs, through National Taiwan University, Taipei, Taiwan [102-E0610]
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For conventional GaN-based high electron mobility transistors (HEMTs), the work function of gate metal is critical to electrical parameters, such as OFF-state leakage current, forward operating current, and threshold voltage. A high work function is thus required to maintain Schottky gate contact. In this letter, an enhancement-mode HEMT composed of p-type GaN/AlGaN/GaN was fabricated. Unlike typical HEMTs that the Schottky barrier height is determined by the energy difference between gate metal work function and semiconductor (AlGaN, or GaN) conduction band, the insertion of the p-GaN relieves the constraint of gate metal. In addition, the gate Schottky barrier now correlates to the valence band of the semiconductor. Here we compare the HEMT performance of different gate metals-Ni/Au, Ti/Au, and Mo/Ti/Au. The results reveal that a tradeoff between V-TH and output drain current.
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