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Organic Single Crystal Transistors Gated by Electric Double Layers in Ionic Liquid

Published online by Cambridge University Press:  01 February 2011

R. Hirahara ,
S. Ono ,
S. Seki ,
Y. Tominari  and
J. Takeya
R. Hirahara
Affiliation:
[email protected], Osaka University, Toyonaka, 560-0043, Japan
S. Ono
Affiliation:
[email protected], CRIEPI, Komae, 201-8511, Japan
S. Seki
Affiliation:
[email protected], CRIEPI, Komae, 201-8511, Japan
Y. Tominari
Affiliation:
[email protected], Osaka University, Toyonaka, 560-0043, Japan
J. Takeya
Affiliation:
[email protected], Osaka University, Graduate School of Science, 1-1, Machikaneyama, Toyonaka, 560-0043, Japan
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Abstract

Gating organic transistors with electric double layers (EDL) of electrolytes is advantageous in injecting high-density carriers with the application of minimum gate voltage. The drawback of such devices, however, has been that commonly used polymer electrolytes suffer relatively slow ionic diffusion before forming the EDLs. In this report, we disclose a new class of EDL devices incorporating low-viscosity room temperature ionic liquid as the electrolyte layer, so that the rapid ionic diffusion allows MHz operation for the transistor performance. We fabricate a well structure using an elastomeric rubber stamp of poly-dimethylsiloxane to hold the ionic liquid 1-ethyl 3-methyl-imidazolium bis(trifluoromethanesulfonyl)imide, known for high ionic conductivity. The transistor performs without hysteresis with the carrier mobility of 5 cm2V−1s−1, realizing the highest sheet transconductance ever achieved.

Keywords

organicdevicesionic conductor
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1091: Symposium AA – Conjugated Organic Materials–Synthesis, Structure, Device and Applications , 2008 , 1091-AA11-52
Copyright
Copyright © Materials Research Society 2008

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