›› 2014, Vol. 23 ›› Issue (11): 117303-117303.doi: 10.1088/1674-1056/23/11/117303

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Effect of gate length on the parameter degradation relations of PMOSFET under NBTI stress

曹艳荣a b, 何文龙a, 曹成a, 杨毅a, 郑雪峰b, 马晓华c, 郝跃b   

  1. a School of Mechano-electric Engineering, Xidian University, Xi'an 710071, China;
    b Key Lab of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an 710071, China;
    c School of Technical Physics, Xidian University, Xi'an 710071, China
  • 收稿日期:2014-04-02 修回日期:2014-05-14 出版日期:2014-11-15 发布日期:2014-11-15
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2011CBA00606), the National Natural Science Foundation of China (Grant Nos. 61334002, 61106106, and 61176130), and the Fundamental Research Fund for the Central Universities of China (Grant No. JB140415).

Effect of gate length on the parameter degradation relations of PMOSFET under NBTI stress

Cao Yan-Rong (曹艳荣)a b, He Wen-Long (何文龙)a, Cao Cheng (曹成)a, Yang Yi (杨毅)a, Zheng Xue-Feng (郑雪峰)b, Ma Xiao-Hua (马晓华)c, Hao Yue (郝跃)b   

  1. a School of Mechano-electric Engineering, Xidian University, Xi'an 710071, China;
    b Key Lab of Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi'an 710071, China;
    c School of Technical Physics, Xidian University, Xi'an 710071, China
  • Received:2014-04-02 Revised:2014-05-14 Online:2014-11-15 Published:2014-11-15
  • Contact: Cao Yan-Rong E-mail:yrcao200@163.com
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2011CBA00606), the National Natural Science Foundation of China (Grant Nos. 61334002, 61106106, and 61176130), and the Fundamental Research Fund for the Central Universities of China (Grant No. JB140415).

摘要: The influence of PMOSFET gate length on the parameter degradation relations under negative bias temperature instability (NBTI) stress is studied. The threshold voltage degradation increases with reducing the gate length. By calculating the relations between the threshold voltage and the linear/saturation drain current, we obtain their correlation coefficients. Comparing the test result with the calculated linear/saturation current value, we obtain the ratio factors. The ratio factors decrease differently when the gate length diminishes. When the gate length reduces to some degree, the linear ratio factor decreases from greater than 1 to nearly 1, but the saturation factor decreases from greater than 1 to smaller than 1. This results from the influence of mobility and the velocity saturation effect. Moreover, due to the un-uniform distribution of potential damages along the channel, the descending slopes of the curve are different.

关键词: negative bias temperature instability (NBTI), gate length, degradation

Abstract: The influence of PMOSFET gate length on the parameter degradation relations under negative bias temperature instability (NBTI) stress is studied. The threshold voltage degradation increases with reducing the gate length. By calculating the relations between the threshold voltage and the linear/saturation drain current, we obtain their correlation coefficients. Comparing the test result with the calculated linear/saturation current value, we obtain the ratio factors. The ratio factors decrease differently when the gate length diminishes. When the gate length reduces to some degree, the linear ratio factor decreases from greater than 1 to nearly 1, but the saturation factor decreases from greater than 1 to smaller than 1. This results from the influence of mobility and the velocity saturation effect. Moreover, due to the un-uniform distribution of potential damages along the channel, the descending slopes of the curve are different.

Key words: negative bias temperature instability (NBTI), gate length, degradation

中图分类号:  (Metal-insulator-semiconductor structures (including semiconductor-to-insulator))

  • 73.40.Qv
85.30.Tv (Field effect devices)