| Original Articles |
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Improvement of Performance of Organic Thin-Film Transistors through Zone Annealing |
| DONG Gui-Fang;LIU Qing-Di;WANG Li-Duo;QIU Yong |
| Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084 |
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| Cite this article: |
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DONG Gui-Fang, LIU Qing-Di, WANG Li-Duo et al 2005 Chin. Phys. Lett. 22 2027-2030 |
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Abstract A zone annealing process is adopted to improve the performance of pentacene organic thin film transistors. The process is completed in a glove box full of dry nitrogen gas and with a heating wire (Ф0.1mm tungsten wire) inside. The device have the structure of glass/ITO (150nm)/Ta2O5 (60nm)/pentacene (60nm)/Au (20nm). Under the gate--source voltage -60V and the drain--source voltage -60V, the source--drain current, the mobility, and the on/off current ratio increase from 4×10-7A to 2.0×10-6A, 2.9×10-3cm2V-1s-1 to 1.6×10 2cm2V-1s-1, and 2×103 to 5.33×103, respectively. It is found that the distance between the pentacene grain boundaries decreases and an obvious layer structure can be formed in grains after annealing. According to the transport of carriers in the polycrystalline film, these changes of the pentacene film can improve the source--drain current and the mobility.
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| Keywords:
72.80.Le
71.23.Cq
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Published: 01 August 2005
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| PACS: |
72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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71.23.Cq
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(Amorphous semiconductors, metallic glasses, glasses)
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