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Storage-period dependent bias-stress instability of solution-processed amorphous indium-zinc-oxide thin-film transistors

Title
Storage-period dependent bias-stress instability of solution-processed amorphous indium-zinc-oxide thin-film transistors
Authors
Kim, JH[Kim, Jung-Hye]Kim, J[Kim, Joonwoo]Jeong, SM[Jeong, Soon Moon]Jeong, J[Jeong, Jaewook]
DGIST Authors
Kim, JH[Kim, Jung-Hye]; Kim, J[Kim, Joonwoo]; Jeong, SM[Jeong, Soon Moon]; Jeong, J[Jeong, Jaewook]
Issue Date
2015-09
Citation
Current Applied Physics, 15, S64-S68
Type
Article
Article Type
Article; Proceedings Paper
Keywords
AcetoneAmorphous FilmsAmorphous Indium-Zinc-Oxide (A-IZO)Bias-Stress InstabilityBias StressChemical CompositionsChemical StabilityEffect of SolventsIndiumIndium Zinc OxidesSol-GelsSolution-ProcessedSolventsStabilityStability ImprovementStorage PeriodStorage PeriodsThin-Film Transistor (TFT)Thin-Film Transistors (TFTs)Thin-FilmsThreshold VoltageZincZinc Oxide
ISSN
1567-1739
Abstract
Storage-period dependent bias stress instability of sol-gel processed amorphous indium zinc oxide (a-InZnO) thin-film transistors (TFTs) was analyzed for more than 90 storage days. Two different solvents, 2-methoxyethnanol and acetyl acetone, were used to investigate the effect of solvent on bias-stress instability. The threshold voltage was shifted to the positive direction under positive gate-bias stress in both devices after 15 days, which is typically observed for conventional amorphous based TFTs. However, after 90 days, the TFTs became stable independent of the chemical compositions of the solvents, indicating that there is a common mechanism for solution processed a-InZnO TFTs concerning stability improvement after long storage periods. It is suggested that out-diffusion of excess oxygen in the channel region is the origin of the stable operation of a-InZnO TFTs after long storage periods. © 2015 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2334
DOI
10.1016/j.cap.2015.04.019
Publisher
Elsevier
Related Researcher
Files:
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Collection:
Smart Textile Convergence Research Group1. Journal Articles
ETC1. Journal Articles


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