Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 50, Issue 6, Pages -Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.50.061001
Keywords
-
Categories
Funding
- Japan Science and Technology Agency (JST)
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Grants-in-Aid for Scientific Research [21246007] Funding Source: KAKEN
Ask authors/readers for more resources
Using a dual-gate structure, we have investigated the impact of gate-stress position on the current collapse behavior of AlGaN/GaN high-electron-mobility transistors (HEMTs) without surface passivation. When the gate-bias stress under the off state was applied to the additional gate between the main gate and the drain electrode, we observed a marked increase in on-resistance (RON). On the other hand, the off-state stress on the main gate itself caused a decrease in drain saturation current as well as an increase in RON. The calculation of electric field at the AlGaN surface showed that the field peaks existed at the gate edges on both the drain and source sides, probably causing electron charging at the AlGaN surface near both gate-edge areas. These results indicated that the off-state gate stress induces virtual gates'' in the gate edges expanding in both the drain and source directions. The impacts of device structures on the current collapse have been characterized, using Schottky-gate HEMTs with and without surface passivation and metal-oxide-semiconductor (MOS) gate HEMTs. The surface passivation and MOS-gate structure was effective in mitigating current collapse, which was explained in terms of surface state density, electric field strength, and gate leakage current. (C) 2011 The Japan Society of Applied Physics
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available