中国物理B ›› 2014, Vol. 23 ›› Issue (6): 68501-068501.doi: 10.1088/1674-1056/23/6/068501

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Positive gate-bias temperature instability of ZnO thin-film transistor

刘玉荣a b, 苏晶a, 黎沛涛c, 姚若河a b   

  1. a The School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, China;
    b National Enginering Technology Research Center for Mobile Ultrasonic Detection, South China University of Technology, Guangzhou 510640, China;
    c Department of Electrical and Electronic Engineering, the University of Hong Kong, Pokfulam Rd., Hong Kong, China
  • 收稿日期:2013-07-24 修回日期:2013-12-26 出版日期:2014-06-15 发布日期:2014-06-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61076113 and 61274085) and the Research Grants Council of Hong Kong, China (Grant No. 7133/07E).

Positive gate-bias temperature instability of ZnO thin-film transistor

Liu Yu-Rong (刘玉荣)a b, Su Jing (苏晶)a, Lai Pei-Tao (黎沛涛)c, Yao Ruo-He (姚若河)a b   

  1. a The School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, China;
    b National Enginering Technology Research Center for Mobile Ultrasonic Detection, South China University of Technology, Guangzhou 510640, China;
    c Department of Electrical and Electronic Engineering, the University of Hong Kong, Pokfulam Rd., Hong Kong, China
  • Received:2013-07-24 Revised:2013-12-26 Online:2014-06-15 Published:2014-06-15
  • Contact: Liu Yu-Rong E-mail:phlyr@scut.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61076113 and 61274085) and the Research Grants Council of Hong Kong, China (Grant No. 7133/07E).

摘要: The positive gate-bias temperature instability of a radio frequency (RF) sputtered ZnO thin-film transistor (ZnO TFT) is investigated. Under positive gate-bias stress, the saturation drain current and OFF-state current decrease, and the threshold voltage shifts toward the positive direction. The stress amplitude and stress temperature are considered as important factors in threshold-voltage instability, and the time dependences of threshold voltage shift under various bias temperature stress conditions could be described by a stretched-exponential equation. Based on the analysis of hysteresis behaviors in current-voltage and capacitance-voltage characteristics before and after the gate-bias stress, it can be clarified that the threshold-voltage shift is predominantly attributed to the trapping of negative charge carriers in the defect states located at the gate-dielectric/channel interface.

关键词: thin-film transistors (TFTs), zinc oxide, gate-bias instability, threshold-voltage shift

Abstract: The positive gate-bias temperature instability of a radio frequency (RF) sputtered ZnO thin-film transistor (ZnO TFT) is investigated. Under positive gate-bias stress, the saturation drain current and OFF-state current decrease, and the threshold voltage shifts toward the positive direction. The stress amplitude and stress temperature are considered as important factors in threshold-voltage instability, and the time dependences of threshold voltage shift under various bias temperature stress conditions could be described by a stretched-exponential equation. Based on the analysis of hysteresis behaviors in current-voltage and capacitance-voltage characteristics before and after the gate-bias stress, it can be clarified that the threshold-voltage shift is predominantly attributed to the trapping of negative charge carriers in the defect states located at the gate-dielectric/channel interface.

Key words: thin-film transistors (TFTs), zinc oxide, gate-bias instability, threshold-voltage shift

中图分类号:  (Field effect devices)

  • 85.30.Tv
73.61.Ga (II-VI semiconductors) 72.80.Ey (III-V and II-VI semiconductors) 73.20.-r (Electron states at surfaces and interfaces)