中国半导体行业协会封装分会会刊

中国电子学会电子制造与封装技术分会会刊

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电子与封装 ›› 2017, Vol. 17 ›› Issue (3): 32 -35. doi: 10.16257/j.cnki.1681-1070.2017.0035

• 微电子制造与可靠性 • 上一篇    下一篇

一种使沟槽侧角圆滑的新颖STI工艺

顾祥,徐海铭,陈海波,吴建伟   

  1. 中国电子科技集团公司第58研究所,江苏 无锡 214072
  • 收稿日期:2016-10-26 出版日期:2017-03-20 发布日期:2017-03-20
  • 作者简介:顾祥(1980—),男 ,江苏盐 城人,东南大学硕士,曾先后在华润上华半导体、华虹 NEC 从事工艺集成、器件开发等工作,目前就职于中国电科集团第 58研究所。

Novel Corner Rounding Process for Shallow Trench Isolation

GU Xiang, XU Haiming, CHEN Haibo,WU Jianwei   

  1. China Electronics Technology Group Corporation No.58 Research Institute,Wuxi 214072, China
  • Received:2016-10-26 Online:2017-03-20 Published:2017-03-20

摘要: 介绍了一种使沟槽侧角圆滑的STI工艺技术,该技术在沟槽腐蚀完,通过湿法工艺去除部分氮化硅(Nitride Pullback),再正常生长线性氧化层,使槽的侧角更加圆润光滑,同时减小了沟槽Divot深度。该工艺避免了附加高温热过程所导致的缺陷扩散和膜应力增大问题,现已成功应用于0.13μm逻辑工艺。采用该工艺完成的器件,反窄沟道效应明显减弱,窄沟器件的漏电有效降低。

关键词: STI, Nitride pullback, 凹槽(divot), 反窄沟道效应

Abstract: A new STI (Shallow Trench Isolation) corner rounding process is proposed. The process removes parts of SIN by wet method after STI etch and grows linear oxide. Highly controlled corner rounding radius and small divot depth is achieved without high temperature oxidation process. Thus it is free from defects and undesirable stress. And now this process is applied to 0.13 μm logic process. The current leakage due to parasitic corner transistors of STI structure is effectively reduced and the reverse narrow channel effect is suppressed clearly.

Key words: STI, Nitride pull back, divot, reverse narrow channel effect

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