中国物理B ›› 2012, Vol. 21 ›› Issue (4): 48502-048502.doi: 10.1088/1674-1056/21/4/048502

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

任敏,李泽宏,邓光敏,张灵霞,张蒙,刘小龙,谢加雄,张波   

  • 收稿日期:2011-08-19 修回日期:2011-10-02 出版日期:2012-02-29 发布日期:2012-02-29
  • 通讯作者: 任敏,renmin@uestc.edu.cn E-mail:renmin@uestc.edu.cn

A novel superjunction MOSFET with improved ruggedness under unclamped inductive switching

Ren Min(任敏), Li Ze-Hong(李泽宏), Deng Guang-Min(邓光敏), Zhang Ling-Xia(张灵霞), Zhang Meng(张蒙), Liu Xiao-Long(刘小龙), Xie Jia-Xiong(谢加雄), and Zhang Bo(张波)   

  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
  • Received:2011-08-19 Revised:2011-10-02 Online:2012-02-29 Published:2012-02-29
  • Contact: Ren Min,renmin@uestc.edu.cn E-mail:renmin@uestc.edu.cn
  • Supported by:
    Project supported by the National Key Scientific and Technological Project (Grant No. 2011ZX02503-005), the Fundamental Research Funds for the Central Universities, China (Grant No. ZYGX2010J038), and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20110185120005).

Abstract: The ruggedness of a superjunction metal-oxide semiconductor field-effect transistor (MOSFET) under unclamped inductive switching conditions is improved by optimizing the avalanche current path. Inserting a P-island with relatively high doping concentration into the P-column, the avalanche breakdown point is localized. In addition, a trench type P+ contact is designed to shorten the current path. As a consequence, the avalanche current path is located away from the N+ source/P-body junction and the activation of the parasitic transistor can be effectively avoided. To verify the proposed structural mechanism, a two-dimensional (2D) numerical simulation is performed to describe its static and on-state avalanche behaviours, and a method of mixed-mode device and circuit simulation is used to predict its performances under realistic unclamped inductive switching. Simulation shows that the proposed structure can endure a remarkably higher avalanche energy compared with a conventional superjunction MOSFET.

Key words: avalanche current path, unclamped inductive switching, superjunction, MOSFET

中图分类号:  (Field effect devices)

  • 85.30.Tv
85.30.De (Semiconductor-device characterization, design, and modeling)