Self-Assembled Photochromic Molecular Dipoles for High Performance Polymer Thin-Film Transistors

Satyaprasad P. Senanayak, Vinod Sangwan, Julian J. McMorrow, Ken Everaerts, Zhihua Chen, Antonio Facchetti, Mark C Hersam, Tobin J Marks, Kavassery Sureswaran Narayan

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Abstract

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 (μFET) exceeding 2 cm2V-1s-1. 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/cm2 to 0.34 μF/cm2, which results in a 200% increase in TFT channel current.

Original languageEnglish
JournalACS Applied Materials and Interfaces
DOIs
Publication statusAccepted/In press - Apr 3 2018

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ASJC Scopus subject areas

  • Materials Science(all)

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