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26 February 2020 Influence of mechanical bending strain on bias-stress stability of flexible top-gate p-type SnO TFTs
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Proceedings Volume 11304, Advances in Display Technologies X; 113040K (2020)
Event: SPIE OPTO, 2020, San Francisco, California, United States
In this paper, flexible coplanar top-gate p-type SnO TFTs are demonstrated. The TFT performance was optimized by adjusting the post-deposition annealing temperature of the SnO channel. The on/off current ratio of the TFT first improves and then degrades as the channel annealing temperature increases. With an optimized annealing temperature of 175C, the flexible SnO TFT exhibits a field-effect mobility of 0.71 cm2/V-s, threshold voltage of 5.2 V, subthreshold swing of 1.6 V/decade, and on/off current ratio of 1.6 x 103. The gate-bias stress stability of the optimized TFT was then investigated. When the TFT is at flat state, the threshold voltage shifts after bias-stressed at +10 V and -10 V for 10000 s are 0.2 V and nearly 0 V, respectively. The electrical stability degrades slightly when the TFT is subjected to both mechanical tensile and compressive strains. At a compressive strain of 0.25%, the threshold voltage shifts increase to 0.8 V and -0.3 V for positive and negative bias stress, respectively. At a tensile strain of 0.25%, the corresponding values are 0.7 V and -0.2 V. Compared with unpassivated bottom-gate SnO TFTs, the gate-bias stress stability is greatly improved.
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
I-Chun Cheng, Shu-Ming Hsu, Wei-Chen Lin, and Jian-Zhang Chen "Influence of mechanical bending strain on bias-stress stability of flexible top-gate p-type SnO TFTs", Proc. SPIE 11304, Advances in Display Technologies X, 113040K (26 February 2020);

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