Ionic-Liquid Component Dependence of Carrier Injection and Mobility for Electric-Double-Layer Organic Thin-Film Transistors
Ionic-Liquid Component Dependence of Carrier Injection and Mobility for Electric-Double-Layer Organic Thin-Film Transistors
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DOI：
10.1021/jp2122642
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发表时间：
2012-03-01
影响因子：
3.7
通讯作者：
Awaga, Kunio
中科院分区：
文献类型：
--
作者：
Fujimoto, Takuya;Matsushita, Michio M.;Awaga, Kunio
采用原位循环伏安法（CV）和电导率测量研究了六种离子液体对八硫代[8]环烯薄膜的静电载流子注入和电化学掺杂。电容测量的频率依赖性表明，离子液体在低于10（2）Hz下形成双电层（EDLs）。八硫[8]环烯的EDL-有机薄膜晶体管（OTFT）的性能表明，晶体管载流子迁移率随着离子液体电容的增加而线性降低。相比之下，电化学氧化电位和阈值电压的EDL-OTFT仅由离子液体的一种成分，即，静电和电化学空穴注入显着影响的阴离子。
Electrostatic carrier injection and electrochemical doping of octathio[8]circulene thin films is examined for six kinds of ionic liquids using in situ cyclic voltammetry (CV) and conductivity measurements. The frequency dependence of the capacitance measurements indicates that the ionic liquids form electric-double-layers (EDLs) below 10(2) Hz. The performance of the EDL-organic thin film transistors (OTFTs) of octathio[8]circulene demonstrates that the transistor carrier mobility shows a linear decrease with an increase in the capacitance of the ionic liquids. In contrast, the electrochemical oxidation potentials and the threshold voltage of the EDL-OTFT are governed only by one component of the ionic liquid; namely, the electrostatic and electrochemical hole injections are significantly affected by the anions.