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Wang, Yu-Xuan; Chang, Ting-Chang; Huang, Shin-Ping; Tai, Mao-Chou; Zheng, Yu-Zhe; Wu, Chia-Chuan; Shih, Yu-Shan; Chen, Yu-An; Tsai, Yu-Lin; Tu, Hong-Yi; Lu, I-Nien; Zhou, Kuan-Ju; Lin, Chih-Chih; Chu, Ann-Kuo; Sze, Simon
IEEE electron device letters, 05/2020, Letnik: 41, Številka: 5Journal Article
In this study, a novel structural device, named as a wing-shaped TFT, is proposed and is demonstrated to prevent fast deterioration under mechanical bending in foldable devices. After long-term mechanical bending, standard low-temperature polysilicon TFTs exhibit instability behaviors such as sub-channel formation, serious threshold voltage shifts, an on-current (ION) increase, and an off-current (IOFF) decrease. These phenomena are believed to be due to additional oxide traps along the channel-width edges of the gate insulator after bending. In order to suppress this degradation, a wing-shaped structure is proposed. By extending the active layer, degradation regions are shifted away from the main channel. Therefore, the reliability of the devices is enhanced. The transfer characteristics show enhanced electrical behavior after being held for 48 hours in a static bent condition, with an 88% drop in threshold voltage shift as well as a 55% decrease in subthreshold swing degradation, proving better durability of the foldable TFT to bending stress for devices with these wings. Time-dependent transfer characteristics, a COMSOL simulation, and device geometry are discussed to support our findings.
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