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Title: Dynamic degradation in SiC Trench MOSFET with a floating p-shield revealed with numerical simulations
Authors: Wei, J
Zhang, M 
Jiang, HP
Wang, HX
Chen, KJ
Keywords: Charge storage
Dynamic R-ON
Floating p-shield
Oxide field
SiC trench MOSFET
Issue Date: 2017
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on electron devices, 2017, v. 64, no. 6, p. 2592-2598 How to cite?
Journal: IEEE transactions on electron devices 
Abstract: A p-type shield region (p-shield) under the gate trench is typically adopted in a SiC trench MOSFET for achieving a lower oxide field and reverse transfer capacitance (C-rss). This paper comparatively studies the effects of a grounded p-shield and a floating p-shield. Device simulations using Sentaurus TCAD are carried out in this paper to reveal the devices' internal dynamics. The floating p-shield can effectively reduce the OFF-state oxide field as a grounded p-shield does, without degrading its static performance. However, after being switched from the OFF-state, the ON-state oxide field in the trench MOSFET with a floating p-shield (FS-MOS) is dramatically elevated. Compared with the trench MOSFET with a grounded p-shield, the FS-MOS also exhibits a higher C-rss and a consequently slower switching speed. Furthermore, the FS-MOS exhibits a degradation of dynamic R-ON during switching operation. A charge storage mechanism is then presented to explain the dynamics in FS-MOS. Upon a high V-DS, holes are emitted from the floating p-shield when the parasitic p-n-p structure consisting of p-shield, p-body, and n-region between them is punched through, leaving negative charges in the floating p-shield even when the high V-DS is removed. Based on this mechanism, the behaviors of the FS-MOS are well explained.
ISSN: 0018-9383
EISSN: 1557-9646
DOI: 10.1109/TED.2017.2697763
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