Effects of a thin Al layer insertion between AlGaN and Schottky gate on the AlGaN∕GaN high electron mobility transistor characteristics
- 23 January 2006
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 88 (4), 043503
- https://doi.org/10.1063/1.2168036
Abstract
To improve an AlGaN∕GaN high electron mobility transistor, an Al layer as thin as 3 nm was inserted between the AlGaN barrier layer and the gate contact. At our preceded experiments on Schottky diodes, we confirmed significant improvement in capacitance-gate voltage characteristics especially at a low frequency as well as drastic reduction in gate leakage current, which should be interpreted in terms of decrease in oxygen-related trap density at the AlGaN surface. As a result of the trap reduction, the transistor indicates marked improvement of current collapse with no degradation in transconductance.Keywords
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