[2025 short course] 5-3: SiC MOSFETs Interface Challenges/PBTI/HTRB/Switching

[2025 short course] 5-3: SiC MOSFETs Interface Challenges/PBTI/HTRB/Switching

by Prof. Tian-Li Wu

Applied Sciences & Engineering Engineering & Technology TJFElectronics engineeringTJFDElectronic devices and materials
🎙 Prof. Tian-Li Wu 👥 11K 📅 October 5, 2025 ⏱ 12 min 👁 736 📄 lecture 🧭 2026-08-16
Available in: English (current) Français

Keywords

SiC MOSFETinterface state densityPBTIHTRBswitching stability

Summary

This lecture segment, part of a short course on reliability and failure physics of semiconductor devices, focuses on the reliability challenges specific to silicon carbide (SiC) MOSFETs. The professor begins by discussing the high interface trap density (Dit) at the SiC/SiO2 interface, which is orders of magnitude higher than in silicon, and methods to reduce it, such as post-oxidation annealing. He then addresses bias temperature instability (BTI) in SiC, highlighting that interface charges alone cannot explain the observed shifts, and introduces the concept of defect bands to model charge trapping. The lecture covers lifetime prediction using power law and thermal activation models, showing how different models lead to vastly different predictions. For off-state reliability, the professor discusses high-temperature reverse bias (HTRB) testing, emphasizing gate oxide breakdown as a critical failure mode. Finally, he presents results on switching stability under hard and zero-voltage switching conditions, showing significant on-resistance degradation under hard switching at high temperatures and frequencies. The lecture concludes with references and a pointer to the full course.

168 words

Critical Evaluation

Value of the Information & Strength of the Argument

The lecture provides valuable insights into the specific reliability challenges of SiC MOSFETs, supported by data from commercial devices and recent literature. The argumentation is solid, systematically explaining the physical mechanisms behind interface traps, BTI, and HTRB, and demonstrating how these affect device lifetime and switching performance. The use of defect band modeling to explain BTI is particularly compelling, as it aligns with similar concepts in GaN technology. The presentation of lifetime prediction models clearly illustrates the impact of model choice on reliability assessment. Overall, the content is technically rigorous and well-argued.

Scientific Rigor, Source Quality, Title Accuracy

The lecture demonstrates scientific rigor by referencing established literature and commercial product data. The sources cited include a textbook and lecture slides from IMEC and other institutions, which are credible in the field. The title accurately reflects the content, focusing on interface challenges, PBTI, HTRB, and switching reliability. The presentation is well-structured, with clear explanations and data to support each point. The adequacy between title and content is high, and the scientific quality is consistent with an academic lecture.

186 words

Title / Content Match

The title accurately reflects the content, covering interface challenges, PBTI, HTRB, and switching reliability in SiC MOSFETs.

Quality & Reliability

8/10

The lecture is delivered by a professor specializing in semiconductor reliability, based on established literature and commercial device data. The content is technically accurate and well-structured, though it is a short course segment and not a peer-reviewed publication.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

  • Reliability and Failure Physics of Semiconductor Devices (course book) — Main reference for the lecture content
  • IMEC lecture slides by Prof. Gido Husen — Reference for some of the presented data and concepts
  • NYCU lecture materials — Full course video recordings

Concurring Sources

Contribution & Novelties

This lecture provides a concise yet comprehensive overview of SiC MOSFET reliability challenges, integrating recent research findings and commercial device data. It highlights the importance of accurate Dit measurement and the use of defect band modeling for BTI, which is a relatively new approach. The discussion on HTRB and switching stability offers practical insights for device design and application.

Pour aller plus loin :

  • SiC MOSFET reliability review — Discusses various reliability aspects of SiC power devices.
  • Defect band model for BTI — Explains the defect band concept in wide bandgap semiconductors.
  • HTRB testing standards — JEDEC standard for high temperature reverse bias testing.

104 words

Radar Profile

The radar profile shows high scores in technical level and information quality, with slightly lower scores in quantity and reliability, reflecting the concise nature of the lecture and reliance on secondary sources. The overall profile indicates a technically strong but not exhaustive treatment of the topic.

Reliability 8/10

💬 No comments were provided for analysis.