Abstract
High-mobility organic thin-film transistors (OTFT) were fabricated with pentacene active layers and passivated by polyvinyl acetate (PVA) in this study. The organic pentacene film showed a single phase structure with the interplanar spacing of 1.54 nm corresponding to the (001) diffraction. The initial field effect mobility of OTFT was 4.4 × 10- 2 cm2/Vs without the passivation. After the PVA passivation, the device exhibited an improved field-effect mobility of 1.0 × 10- 1 cm2/Vs. It was decreased to 8.0 × 10- 2 cm2/Vs after 35 days. The on/off current ratio has been at the order of 106. The device durability was also examined by 80° bending cycle tests in tension. The transistors exhibited lower on/off ratio and higher turn-on voltage after 2500 bending cycles. The lifetime of the passivated OTFT was improved to more than 2 months in air. It has been suggested that the PVA passivation layer could effectively protect the pentacene-based OTFT from moisture and oxygen permeation.
Original language | English |
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Pages (from-to) | 5318-5321 |
Number of pages | 4 |
Journal | Thin Solid Films |
Volume | 517 |
Issue number | 17 |
DOIs | |
State | Published - 01 07 2009 |
Keywords
- Organic thin-film transistor
- Passivation
- Pentacene