中国物理B ›› 2011, Vol. 20 ›› Issue (12): 120703-120703.doi: 10.1088/1674-1056/20/12/120703

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Total ionizing dose effect in an input/output device for flash memory

张正选1, 邵华1, 毕大炜1, 邹世昌1, 刘张李2, 胡志远2, 陈明2, 宁冰旭2   

  1. (1)The State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China; (2)The State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;Graduate University of the Chinese Academy of Sciences, Beijing 100049, Chi
  • 收稿日期:2011-05-03 修回日期:2011-06-22 出版日期:2011-12-15 发布日期:2011-12-15

Total ionizing dose effect in an input/output device for flash memory

Liu Zhang-Li(刘张李)a)b)†, Hu Zhi-Yuan(胡志远) a)b), Zhang Zheng-Xuan(张正选)a), Shao Hua(邵华)a), Chen Ming(陈明) a)b), Bi Da-Wei(毕大炜)a), Ning Bing-Xu(宁冰旭)a)b), and Zou Shi-Chang(邹世昌)a)   

  1. a The State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China; b Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
  • Received:2011-05-03 Revised:2011-06-22 Online:2011-12-15 Published:2011-12-15

摘要: Input/output devices for flash memory are exposed to gamma ray irradiation. Total ionizing dose has been shown great influence on characteristic degradation of transistors with different sizes. In this paper, we observed a larger increase of off-state leakage in the short channel device than in long one. However, a larger threshold voltage shift is observed for the narrow width device than for the wide one, which is well known as the radiation induced narrow channel effect. The radiation induced charge in the shallow trench isolation oxide influences the electric field of the narrow channel device. Also, the drain bias dependence of the off-state leakage after irradiation is observed, which is called the radiation enhanced drain induced barrier lowing effect. Finally, we found that substrate bias voltage can suppress the off-state leakage, while leading to more obvious hump effect.

关键词: input/output device, oxide trapped charge, radiation induced narrow channel effect, shallow trench isolation, total ionizing dose

Abstract: Input/output devices for flash memory are exposed to gamma ray irradiation. Total ionizing dose has been shown great influence on characteristic degradation of transistors with different sizes. In this paper, we observed a larger increase of off-state leakage in the short channel device than in long one. However, a larger threshold voltage shift is observed for the narrow width device than for the wide one, which is well known as the radiation induced narrow channel effect. The radiation induced charge in the shallow trench isolation oxide influences the electric field of the narrow channel device. Also, the drain bias dependence of the off-state leakage after irradiation is observed, which is called the radiation enhanced drain induced barrier lowing effect. Finally, we found that substrate bias voltage can suppress the off-state leakage, while leading to more obvious hump effect.

Key words: input/output device, oxide trapped charge, radiation induced narrow channel effect, shallow trench isolation, total ionizing dose

中图分类号:  (Spaceborne and space research instruments, apparatus, and components (satellites, space vehicles, etc.))

  • 07.87.+v
85.30.-z (Semiconductor devices)