  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 exceeding 2
cm^2/(V.s). 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 uF/cm^2 to 0.34 uF/cm^2, which
results in a 200% increase in TFT channel current.
