Gradual improvements of charge carrier mobility at ionic liquid/rubrene single crystal interfaces

We report evolution of electric characteristics of an electric double layer field-effect transistor based on the ionic liquid/rubrene single crystal interfaces. In contrast to usual devices, the field effect mobility was found to gradually increase with time for a day, followed by minor long-term fl...

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Bibliographic Details
Published in:Applied physics letters 2016-02, Vol.108 (8)
Main Authors: Yokota, Yasuyuki, Hara, Hisaya, Morino, Yusuke, Bando, Ken-ichi, Ono, Sakurako, Imanishi, Akihito, Okada, Yugo, Matsui, Hiroyuki, Uemura, Takafumi, Takeya, Jun, Fukui, Ken-ichi
Format: Article
Language:English
Subjects:
Applied physics
Atomic force microscopy
Carrier mobility
Current carriers
Electric double layer
Evolution
Field effect transistors
Frequency modulation
Ionic liquids
Ions
Semiconductor devices
Single crystals
Variation
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Summary:We report evolution of electric characteristics of an electric double layer field-effect transistor based on the ionic liquid/rubrene single crystal interfaces. In contrast to usual devices, the field effect mobility was found to gradually increase with time for a day, followed by minor long-term fluctuations. Although the details of the evolution were somewhat device dependent, the final values of the mobility turned out to be 3–4 times larger irrespective of the initial values. These observations are explained by the evolution of the flat interface by defect-induced spontaneous dissolution of rubrene molecules at the ionic liquid/rubrene single crystal interfaces, revealed by frequency modulation atomic force microscopy.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4942676