Impact of low-dose radiation on nitrided lateral 4H-SiC MOSFETs and the related mechanisms  

作　　者：张文浩 朱马光 余康华 李诚瞻 王俊 向立 王雨薇 Wen-Hao Zhang;Ma-Guang Zhu;Kang-Hua Yu;Cheng-Zhan Li;Jun Wang;Li Xiang;Yu-Wei Wang(College of Materials Science and Engineering,Hunan University,Changsha 410082,China;School of Integrated Circuits,Nanjing University,Suzhou 210008,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;State Key Laboratory of Advanced Power Semiconductor Devices,Zhuzhou CRRC Times Semiconductor Co.,Ltd.,Zhuzhou 412001,China)

机构地区：[1]College of Materials Science and Engineering,Hunan University,Changsha 410082,China [2]School of Integrated Circuits,Nanjing University,Suzhou 210008,China [3]College of Electrical and Information Engineering,Hunan University,Changsha 410082,China [4]State Key Laboratory of Advanced Power Semiconductor Devices,Zhuzhou CRRC Times Semiconductor Co.,Ltd.,Zhuzhou 412001,China

出　　处：《Chinese Physics B》2023年第5期637-643,共7页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.52107190 and 62101181);China Postdoctoral Science Foundation(Grant No.2021M700203)。

摘　　要：Lateral type n-channel 4H-SiC metal–oxide–semiconductor field effect transistors(MOSFETs),fabricated using a current industrial process,are irradiated with gamma rays at different irradiation doses in this paper to carry out a profound study on the generation mechanism of radiation-induced interface traps and oxide trapped charges.Electrical parameters(e.g.,threshold voltage,subthreshold swing and channel mobility)of the device before and after irradiation are investigated,and the influence of the channel orientation([1100]and[1120])on the radiation effect is discussed for the first time.A positive threshold voltage shift is observed at very low irradiation doses(<100 krad(Si));the threshold voltage then shifts negatively as the dose increases.It is found that the dependence of interface trap generation on the radiation dose is not the same for doses below and above 100 krad.For irradiation doses<100 krad,the radiation-induced interface traps with relatively high generation speeds dominate the competition with radiation-induced oxide trapped charges,contributing to the positive threshold voltage shift correspondingly.All these results provide additional insight into the radiation-induced charge trapping mechanism in the SiO_(2)/SiC interface.

关 键 词：SiC MOSFET gamma-ray irradiation interface traps oxide-trapped charges 

分 类 号：TN386[电子电信—物理电子学]