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10 kV, 5A 4H-SiC Power DMOSFET



Sei-Hyung Ryu, Sumi Krishnaswami, Hull Brett, James Richmond, Anant Agarwal, Allen R. Hefner Jr.


In this paper, we report 4H-SiC power DMOSFETs capable of blocking 10 kV. The devices were scaled up to 5 A, which is a factor of 25 increase in device area compared to the previously reported value. The devices utilized 100 υm thick n-type epilayers with a doping concentration of 6 x 1014 cm-3 for the drift layer, and a floating guard ring based edge termination structure was used. The gate oxide layer was formed by thermal oxidation at 1175oC, followed by an NO anneal. A peak effective channel mobility of 13 cm2/Vs was extracted from a test MOSFET with a W/L of 150 υm / 150 υm, built adjacent to the power DMOSFETs. A 4H-SiC DMOSFET with an active area of 0.15 cm2 showed a specific on-resistance of 111 mOhm}-cm2 at room temperature with a gate bias of 15 V. The device shows a leakage current of 3.3 ??A, which corresponds to a leakage current density of 11 υA-cm-2 at a drain bias of 10 kV.
IEEE Transactions on Electron Devices


High-Voltage, power MOSFET, Silicon-Carbide


Ryu, S. , Krishnaswami, S. , Brett, H. , Richmond, J. , Agarwal, A. and Hefner Jr., A. (2006), 10 kV, 5A 4H-SiC Power DMOSFET, IEEE Transactions on Electron Devices, [online], (Accessed June 20, 2024)


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Created April 30, 2006, Updated October 12, 2021