Author:
Liu Shih Chien,Wong Yuen-Yee,Lin Yueh-Chin,Chang Edward Yi
Abstract
An effective passivation and gate insulator with low current collapse and improved dynamic ON-state resistance (R
ON) for GaN MIS-HEMT is demonstrated in this work. The structure of passivation and gate insulator is fabricated by 4-nm SiN as the first passivation layer and 1-nm AlN. The bilayer AlN/SiN structure integrates the advantages of SiN and AlN. SiN passivation has been proved to effectively reduce GaN surface states. AlN has high bandgap of ~6.2 eV which can suppress leakage current. Hence, the unfavorable effects such as trapping effect and leakage current which will induce current collapse and are effectively suppressed by using AlN/SiN bilayer thin film. A GaN MIS-HEMT with AlN/SiN passivation and gate dielectric exhibits improved I‒V characteristics, low leakage current, low current collapse, and improved dynamic R
ON at high quiescent drain bias of 100 V.
Publisher
The Electrochemical Society
Cited by
7 articles.
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