Orders-of-magnitude enhancement in conductivity tuning in InGaZnO thin-film transistors via SiNx passivation and dual-gate modulation

Journal of Information Display

GongTan Li¹  Shan Li¹  JiWen Zheng²  Chuan Liu²  Qian Wu²  ChenNing Liu²  ChangDong Chen²  Jin Wu² 

[1] Shenzhen China Star Optoelectronics Technology Co., Ltd.;Sun Yat-sen University;

关键词: A-InGaZnO;    SiNx passivation;    enhanced conductivity tuning;    hydrogen doping;    dual gate;   

DOI  :  10.1080/15980316.2019.1649729

来源: DOAJ

【 摘 要 】

The mobility of pristine amorphous indium gallium zinc oxide (a-IGZO) thin-film transistors (TFTs) is insufficient to meet the requirement of the future ultra-high-definition displays. Reported herein is the fabrication of hydrogenated long-channel IGZO TFTs exhibiting a transconductance and an on/off ratio that are orders of magnitude superior to those of the regular devices. The gate bias stability of the treated IGZO TFTs was greatly enhanced, with the threshold voltage shifting by less than 1 V after 1 h stress. Experimentally, the hydrogenation of the active layer was achieved via the deposition of a SiNx/SiOx bilayer on top of the IGZO via plasma-enhanced chemical vapor deposition followed by post-annealing under optimized conditions. The elemental depth profiles indicated that this enhanced performance originated from the hydrogen doping of the IGZO film. Furthermore, a dual-gate structure was fabricated to alleviate the deterioration of the subthreshold properties induced by the excess hydrogen doping.

【 授权许可】

Unknown