中国物理B ›› 2019, Vol. 28 ›› Issue (8): 87302-087302.doi: 10.1088/1674-1056/28/8/087302

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

Effects of active layer thickness on performance and stability of dual-active-layer amorphous InGaZnO thin-film transistors

Wenxing Huo(霍文星), Zengxia Mei(梅增霞), Yicheng Lu(卢毅成), Zuyin Han(韩祖银), Rui Zhu(朱锐), Tao Wang(王涛), Yanxin Sui(隋妍心), Huili Liang(梁会力), Xiaolong Du(杜小龙)   

  1. 1 Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Department of Electrical and Computer Engineering, Rutgers University, 94 Brett Rd, Piscataway, New Jersey 08854;
    4 Songshan Lake Materials Laboratory, Dongguan 523808, China
  • 收稿日期:2019-04-03 修回日期:2019-06-04 出版日期:2019-08-05 发布日期:2019-08-05
  • 通讯作者: Zengxia Mei, Xiaolong Du E-mail:zxmei@iphy.ac.cn;xldu@iphy.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11674405, 61874139, and 11675280).

Effects of active layer thickness on performance and stability of dual-active-layer amorphous InGaZnO thin-film transistors

Wenxing Huo(霍文星)1,2, Zengxia Mei(梅增霞)1, Yicheng Lu(卢毅成)3, Zuyin Han(韩祖银)1,2, Rui Zhu(朱锐)1,2, Tao Wang(王涛)1,2, Yanxin Sui(隋妍心)1,2, Huili Liang(梁会力)1, Xiaolong Du(杜小龙)1,4   

  1. 1 Key Laboratory for Renewable Energy, Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Department of Electrical and Computer Engineering, Rutgers University, 94 Brett Rd, Piscataway, New Jersey 08854;
    4 Songshan Lake Materials Laboratory, Dongguan 523808, China
  • Received:2019-04-03 Revised:2019-06-04 Online:2019-08-05 Published:2019-08-05
  • Contact: Zengxia Mei, Xiaolong Du E-mail:zxmei@iphy.ac.cn;xldu@iphy.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11674405, 61874139, and 11675280).

摘要:

Dual-active-layer (DAL) amorphous InGaZnO (IGZO) thin-film transistors (TFTs) are fabricated at low temperature without post-annealing. A bottom low-resistance (low-R) IGZO layer and a top high-resistance (high-R) IGZO layer constitute the DAL homojunction with smooth and high-quality interface by in situ modulation of oxygen composition. The performance of the DAL TFT is significantly improved when compared to that of a single-active-layer TFT. A detailed investigation was carried out regarding the effects of the thickness of both layers on the electrical properties and gate bias stress stabilities. It is found that the low-R layer improves the mobility, ON/OFF ratio, threshold voltage and hysteresis voltage by passivating the defects and providing a smooth interface. The high-R IGZO layer has a great impact on the hysteresis, which changes from clockwise to counterclockwise. The best TFT shows a mobility of 5.41 cm2/V…, a sub-threshold swing of 95.0 mV/dec, an ON/OFF ratio of 6.70×107, a threshold voltage of 0.24 V, and a hysteresis voltage of 0.13 V. The value of threshold voltage shifts under positive gate bias stress decreases when increasing the thickness of both layers.

关键词: thin film transistor, InGaZnO, dual-active-layer

Abstract:

Dual-active-layer (DAL) amorphous InGaZnO (IGZO) thin-film transistors (TFTs) are fabricated at low temperature without post-annealing. A bottom low-resistance (low-R) IGZO layer and a top high-resistance (high-R) IGZO layer constitute the DAL homojunction with smooth and high-quality interface by in situ modulation of oxygen composition. The performance of the DAL TFT is significantly improved when compared to that of a single-active-layer TFT. A detailed investigation was carried out regarding the effects of the thickness of both layers on the electrical properties and gate bias stress stabilities. It is found that the low-R layer improves the mobility, ON/OFF ratio, threshold voltage and hysteresis voltage by passivating the defects and providing a smooth interface. The high-R IGZO layer has a great impact on the hysteresis, which changes from clockwise to counterclockwise. The best TFT shows a mobility of 5.41 cm2/V…, a sub-threshold swing of 95.0 mV/dec, an ON/OFF ratio of 6.70×107, a threshold voltage of 0.24 V, and a hysteresis voltage of 0.13 V. The value of threshold voltage shifts under positive gate bias stress decreases when increasing the thickness of both layers.

Key words: thin film transistor, InGaZnO, dual-active-layer

中图分类号:  (II-VI semiconductors)

  • 73.61.Ga
77.55.hf (ZnO) 85.30.-z (Semiconductor devices) 85.30.Tv (Field effect devices)