Journal
APPLIED PHYSICS EXPRESS
Volume 15, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.35848/1882-0786/ac407e
Keywords
polarization doping; InGaN p-gate cap layer; normally-off GaN HEMT; Schottky-type gate contact; gate swing range
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Funding
- National Key R&D Program of China [2017YFB0403003]
- National Natural Science Foundation of China [62004099, 61921005, 91850112]
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This study demonstrates the successful implementation of high-quality gate current blocking performance in GaN HEMTs through the development of dopant-free p-type polarization doping technique, improving the reliability of gate circuits.
Narrow gate margin has been the critical limiting factor for the p-gate normally-off GaN HEMTs, imposing significant challenges in both gate drive design and gate reliability. In this work, by developing dopant-free p-type polarization doping technique in composition-graded InGaN layer, high-quality Schottky contact between the gate metal and cap layer was demonstrated, achieving excellent gate current blocking performance (10(-6 )mA mm(-1)) after the turning-on of the gate heterojunction structure. Resultantly, normally-off GaN HEMTs with enhanced gate breakdown voltage up to 15.2 V was realized, being especially beneficial for the simplification of gate drive design and the safe operation of gate terminal.
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