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Densification Control as a Method of Improving the Ambient Stability of Sol-Gel-Processed SnO2 Thin-Film Transistors
- Densification Control as a Method of Improving the Ambient Stability of Sol-Gel-Processed SnO2 Thin-Film Transistors
- Lee, Won-Yong; Ha, Seung Hyun; Lee, Hyunjae; Bae, Jin-Hyuk; Jang, Bongho; Kwon, Hyuk-Jun; Jang, Jaewon
- DGIST Authors
- Kwon, Hyuk-Jun
- Issue Date
- IEEE Electron Device Letters, 40(6), 905-908
- Article Type
- Author Keywords
- Sol-gel; SnO2; thin film transistors; ambient stability; densification
- Densification; Deterioration; Electric field effects; Passivation; Sol-gel process; Stability; Thin film circuits; Thin films; Active channel layers; Ambient stability; Electrical stability; Environmental stability; Field-effect mobilities; N-type semiconductors; Performance deterioration; Thin-film transistor (TFTs); Thin film transistors
- We use sol-gel-processed SnO to fabricate thin-film transistors (TFTs) with good ambient stability, showing that SnO film densification can be effectively controlled by a choice of proper drying temperatures. In particular, TFTs comprising SnO2 films dried at 150 °C show conventional n-type semiconductor properties, high-saturation-regime field-effect mobility (7.3 cm Vs), good on/off current ratio, excellent sub-threshold swing values, and good electrical stability after 30-day exposure to ambient air, which alleviates the need for additional passivation layers to protect the active channel layer. Conversely, TFTs comprising SnO2 films dried at 50 or 100 °C show poor environmental stability due to low densification. Specifically, less dense films are characterized by the presence of loosely packed structures and small contact areas between crystallites, which promote the adsorption of gas molecules from the surroundings and result in significant TFT performance deterioration. © 1980-2012 IEEE.
- Institute of Electrical and Electronics Engineers
- Related Researcher
Advanced Electronic Devices Research Group(AEDRG) - Kwon Lab.
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- Department of Information and Communication EngineeringAdvanced Electronic Devices Research Group(AEDRG) - Kwon Lab.1. Journal Articles
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