Low ohmic-contact resistance in recessed-gate normally-off AlGaN/GaN MIS-HEMT with δ-doped GaN Cap Layer
Summary form only given. In this paper, we discuss an ohmic contact resistance (R c ) in a recessed-gate normally-off AlGaN/GaN MIS-HEMT with a δ-doped GaN Cap Layer. This structure ensures high uniformity of a threshold voltage (V th ) by a selective dry-etching of GaN over AlGaN at a gate region....
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Published in | 2015 73rd Annual Device Research Conference (DRC) pp. 59 - 60 |
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Main Authors | , , , , , , , , , |
Format | Conference Proceeding |
Language | English |
Published |
IEEE
01.06.2015
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Subjects | |
Online Access | Get full text |
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Summary: | Summary form only given. In this paper, we discuss an ohmic contact resistance (R c ) in a recessed-gate normally-off AlGaN/GaN MIS-HEMT with a δ-doped GaN Cap Layer. This structure ensures high uniformity of a threshold voltage (V th ) by a selective dry-etching of GaN over AlGaN at a gate region. At the δ-doped region of the GaN cap layer, diffusion of electrons toward the surface leaves excess ionized donors, resulting in compensation of negative polarization charges between the GaN cap and the AlGaN barrier. Thanks to this effect, we successfully obtained an low R c of less than 0.1 Ωmm by reduction of band-barrier at the interface between the GaN cap and the AlGaN barrier. |
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ISBN: | 9781467381345 1467381349 |
ISSN: | 1548-3770 2640-6853 |
DOI: | 10.1109/DRC.2015.7175553 |