Self-Assembled Photochromic Molecular Dipoles for High Performance Polymer Thin-Film Transistors.
ACS applied materials & interfaces(2018)
摘要
The development of high performance multifunctional polymer-based electronic circuits is a major step towards future flexible electronics. Here, we demonstrate a tunable approach to fabricate such devices based on rationally designed dielectric super-lattice structures with photochromic azo-benzene molecules. These nanodielectrics possessing ionic, molecular, and atomic polarization are utilized in polymer thin-film transistors (TFTs) to realize high performance electronics with p-type field-effect mobility (μ) exceeding 2 cmVs. A crossover in the transport mechanism from electrostatic dipolar disorder to ionic-induced disorder is observed in the transistor characteristics over a range of temperatures. The facile supramolecular design allows the possibility to optically control the extent of molecular and ionic polarization in the ultra-thin nanodielectric. Thus, we demonstrate a three-fold increase in the capacitance from 0.1 μF/cm to 0.34 μF/cm, which results in a 200% increase in TFT channel current.
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关键词
nanodielectrics,self-assembly,polymer transistors,photochromism,phototransistors
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