학술논문
High- Temperature PBTI in Trench-Gate Vertical GaN Power MOSFETs: Role of Border and Semiconductor Traps
Document Type
Conference
Author
Source
2023 IEEE International Reliability Physics Symposium (IRPS) Reliability Physics Symposium (IRPS), 2023 IEEE International. :1-6 Mar, 2023
Subject
Language
ISSN
1938-1891
Abstract
For the first time we investigate the positive threshold voltage instability in GaN-based trench gate MOSFETs in the high-temperature regime (150–240 °C). First, by inverse Laplace transform we determine the equivalent distribution of activation energies of the traps responsible for PBTI, with a peak at 0.75 eV from the conduction band of GaN. Second, we demonstrate that the recovery transients have a non-monotonic trend. This result, never described before, is attributed to the interplay between electron de-trapping from border traps, and hole de-trapping from defects in the p-type body layer, located 0.65 eV above the valence band energy of GaN, and preliminary ascribed to gallium vacancies in the semiconductor. Results provide relevant insight for optimizing the high-temperature stability of GaN vertical FETs.