西安电子科技大学学报

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硅通孔热应力导致器件迁移率变化分析

董刚;姚奕彤;刘荡;杨银堂   

  1. (西安电子科技大学 微电子学院,陕西 西安 710071)
  • 收稿日期:2016-12-14 出版日期:2017-12-20 发布日期:2018-01-18
  • 作者简介:董刚(1978-),男,教授,E-mail: gdong@mail.xidian.edu.cn
  • 基金资助:

    国家自然科学基金资助项目(61574106,61574104);国家部委基金资助项目(9140A23060115DZ01062);陕西省科技统筹创新工程计划资助项目(2015KTCQ01-5)

Analysis of through silicon via thermal stress induced device mobility variations

DONG Gang;YAO Yitong;LIU Dang;YANG Yintang   

  1. (School of Microelectronics, Xidian Univ., Xi'an 710071, China)
  • Received:2016-12-14 Online:2017-12-20 Published:2018-01-18

摘要:

针对硅通孔热应力导致的沿不同晶向放置的器件迁移率变化进行了讨论.依据弹性理论,铜和硅衬底之间的热膨胀系数失配能够产生硅通孔热应力,考虑压阻效应,热应力将导致载流子迁移率的变化.因此,文中首先依据平面应变理论,建立了硅通孔热应力的紧凑解析模型;接着利用Matlab仿真,分别得出了硅通孔热应力对沟道方向沿[100]和[110]的载流子迁移率的影响,并考虑到可靠性,定义了阻止区;最后,得出了[100]晶向和[-110]晶向应分别作为N沟道金属氧化物半导体器件和P沟道金属氧化物半导体器件的优先选择的结论.

关键词: 硅通孔, 热应力, 迁移率, 阻止区

Abstract:

This paper studies the mobility variations of the devices placed in different crystal orientations induced by the through silicon via thermal stress. According to the elasticity theory, the mismatch of thermal expansion coefficients between copper and silicon substrate can induce the through silicon via thermal stress, which may cause carrier mobility variations due to the piezoresistive effect. In this paper, a compact analytical model of the through silicon via thermal stress is given based on the planar strain theory. Then the impacts of the through silicon via thermal stress on carrier mobility are presented by using Matlab with the channel direction along[100] and[110], respectively. And the Keep Off Zone is defined for considering the reliability of the device. Finally, we draw a conclusion that the[100] crystal orientation and the[-110] crystal orientation should be preferred as the NMOS device and the PMOS device, respectively.

Key words: through silicon via, thermal stress, mobility, keep off zone