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    王源, 张立忠, 曹健, 陆光易, 贾嵩, 张兴

    Research on electrostatic discharge characteristics of tunnel field effect transistors

    Wang Yuan, Zhang Li-Zhong, Cao Jian, Lu Guang-Yi, Jia Song, Zhang Xing
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    • 随着器件尺寸的不断减小,集成度的逐步提高,功耗成为了制约集成电路产业界发展的主要问题之一. 由于通过引入带带隧穿机理可以实现更小的亚阈值斜率,隧道场效应晶体管(TFET)器件已成为下一代集成电路的最具竞争力的备选器件之一. 但是TFET器件更薄的栅氧化层、更短的沟道长度容易使器件局部产生高的电流密度、电场密度和热量,使得其更容易遭受静电放电(ESD)冲击损伤. 此外,TFET器件基于带带隧穿机理的全新工作原理也使得其ESD保护设计面临更多挑战. 本文采用传输线脉冲的ESD测试方法深入分析了基本TFET器件在ESD冲击下器件开启、维持、泄放和击穿等过程的电流特性和工作机理. 在此基础之上,给出了一种改进型TFET抗ESD冲击器件,通过在源端增加N型高掺杂区,有效的调节接触势垒形状,降低隧穿结的宽度,从而获得更好的ESD设计窗口.
      Power consumption has been the major bottleneck in the development of integrated circuits with reduced critical dimensions and improved integrated level. Tunnel field effect transistor (TFET) has been investigated as one of the promising replacements for traditional metal oxide semiconductor field effect transistor (MOSFET), owing to the introduction of band to band tunneling (BTBT) mechanism based on which a smaller subthreshold slope is achieved. However, a thinner oxide layer and a shorter channel length in TFET may induce localization of high current density, high electrical field distribution, and generation of heat, which abate the probability to survive electrostatic discharge (ESD). Besides, the novel BTBT operating principles also present a challenge to TFET ESD protection design. In this paper transmission line pulse test method is adopted to analyze the working principle of conventional TFET at onset, holding, discharge, and second breakdown during an ESD event. Based on these a new TFET ESD device protection design is proposed and characterized with a deeply doped n+ pocket near the source region beneath the gate, which can make effective adjustments of contact potential barrier, reduce tunneling junction width, thus better ESD design windows are obtained.
        • 基金项目:国家自然科学基金青年科学基金(批准号:61106101)资助的课题.
        • Funds:Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 61106101).
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      • 被引次数:0
      出版历程
      • 收稿日期:2014-04-11
      • 修回日期:2014-04-30
      • 刊出日期:2014-09-05

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