期刊
JAPANESE JOURNAL OF APPLIED PHYSICS
卷 53, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.7567/JJAP.53.05FD01
关键词
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资金
- NEDO Grant
- NICT
- Advanced Low Carbon Technology Research and Development Program (ALCA) of Japan Science and Technology Agency
- Strategic International Collaborative Research Program (SICORP) of Japan Science and Technology Agency
- Japan Society for the Promotion of Science
- Grants-in-Aid for Scientific Research [25107002, 24681030] Funding Source: KAKEN
Chemical doping with poly(ethylene imine) (PEI) is often used to produce n-type carbon nanotube thin-film transistors (CNT TFTs) with stability in air. However, the effect of air on the device characteristics has not yet been fully investigated. In this study, we performed a detailed investigation on how the oxygen and water present in air affect stability issues, including hysteresis, current collapse, and ambipolar properties of PEI-doped n-type CNT TFTs fabricated on a transparent plastic film. We found that current collapse and hysteresis are predominantly caused by the combination of water and oxygen, suggesting that a water/oxygen redox reaction is responsible for the instability of PEI-doped devices. Water vapor has a rather more severe impact in the case of PEI-doped devices than in the case of undoped CNT TFTs because of the hygroscopicity of PEI. Surface passivation with Al2O3, deposited by a low-temperature atomic layer deposition technique, notably improved the stability of the device properties in ambient air. (C) 2014 The Japan Society of Applied Physics
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