期刊
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
卷 9, 期 2, 页码 2180-2189出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2019.2948836
关键词
Degradation; repetitive switching stress; SiC power metal-oxide-semiconductor field-effect transistor (MOSFET)
资金
- China Postdoctoral Science Foundation [2019TQ0059]
- National Natural Science Foundation of China [61604038, 61674030]
- Natural Science Foundation of Jiangsu Province [BK20160691, BK20181140]
- Foundation of State Key Laboratory of Wide-Bandgap Semiconductor Power Electronics Devices [2017KF003]
- Fundamental Research Funds for the Central Universities
The degradation of electrical parameters for SiC power MOSFETs under repetitive switching stress is mainly caused by the injection of negative charges, leading to an increase in threshold voltage and ON-state resistance. Different stages during the switching process have varying effects on the device, with the conduction stage being the main stage for charge injection. Additionally, the research proves the robustness of SiC power MOSFETs under repetitive out-of-SOA switching conditions.
The degradation of electrical parameters for SiC power metal-oxide-semiconductor field-effect transistors (MOSFETs) under repetitive switching stress is investigated in detail. The dominant degradation mechanism is demonstrated to be the injection of negative charges into the gate oxide interface along the channel. It results in the increase in threshold voltage (V-th) and the increase in ON-state resistance (R-dson) under low gate bias condition. Furthermore, the influences of different stages during an entire switching process on the degradation trend of the device are verified. It is found that the charges are mainly injected into the gate oxide during the conduction stage. Even though the turn-on stage rarely results in the injection directly, it increases the junction temperature (T-j), contributing to the injection of charges during the conduction stage. However, the turn-off stage barely degrades the performance of the device. The research also proves the robustness of SiC power MOSFETs under repetitive out-of-safe operating area (SOA) switching conditions. Moreover, the degradation of switching behaviors of the device is analyzed. The increased V-th increases the Miller plateau voltage (V-gp), leading to the increase in turn-on time and the decrease in turn-off time. Hence, the turn-on dissipated energy (E-on) increases, while the turn-off dissipated energy (E-off) decreases after enduring the stress.
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