Field Effect Transistors Characteristics Based on Blends of Si Nanowires and Poly(3-dodecylthiophene)
Received date: 2015-12-21
Online published: 2016-04-08
Supported by
Project supported by the National Natural Science Foundation of China (Nos. 21274027, 20974022) and the Innovation Program of Shanghai Municipal Education Commission (No. 15ZZ002).
In order to enhance the field effect mobility of poly(3-dodecylthiophene), Si nanowires were added to the poly(3-dodecylthiophene) solution prior to film formation. The Si nanowires were produced by the electroless metal deposition method which involved the etching of silicon wafers in aqueous hydrofluoric acid and silver nitrate solution. The observation of scanning electron microscopy proved the uniform Si nanowires were obtained. The blend film was treated with thermal annealing to form ordered microcrystalline structure by self-organization. The annealing effect was measured by X-ray diffraction and atomic force microscopy which showed the enhancing diffraction peak and ordered atomic force microscopy images after annealing films. In the bottom gated field effect transistors, the blend film of Si nanowires and poly(3-dodecylthiophene) were formed on the SiO2/Si substrate by spin coating. The surface of the SiO2/Si substrate was coated with hexamethyldisilazane to produce a hydrophobic surface. The thickness of the Au source/drain electrodes was 100 nm. The annealing blend films worked as the semiconducting layer, 300 nm SiO2 worked as the gate dielectric and Si worked as the gate electrode. The charge carrier mobility of poly(3-dodecylthiophene) thin films was 0.015 cm2·V-1·s-1 and the charge carrier mobility of blend films was up to 0.68 cm2·V-1·s-1. The remarkable increase in the field effect mobility over that of pristine poly(3-dodecylthiophene) film is due to the high conductivity of Si nanowires which act as fast conducting channel between the crystalline regions of the poly(3-dodecylthiophene) film. To confirm and enhance the field effect transistors properties, we used the electric-double-layer transistor based on the blend films in which ion gel worked as the gate dielectric instead of SiO2. Here, Au foil worked as the gate electrode to form a top-gated field effect transistors. The charge carrier mobility of blend films was found to be relatively higher (6.2 cm2·V-1·s-1) when using ion gel as the dielectric layer.
Zhu Haoyun , Huang Wei , Huang Yuli , Wang Weizhi . Field Effect Transistors Characteristics Based on Blends of Si Nanowires and Poly(3-dodecylthiophene)[J]. Acta Chimica Sinica, 2016 , 74(5) : 429 -434 . DOI: 10.6023/A15120789
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