Microstructural control suppresses thermal activation of electron transport at room temperature in polymer transistors.

ABSTRACT: Recent demonstrations of inverted thermal activation of charge mobility in polymer field-effect transistors have excited the interest in transport regimes not limited by thermal barriers. However, rationalization of the limiting factors to access such regimes is still lacking. An improved understanding in this area is critical for development of new materials, establishing processing guidelines, and broadening of the range of applications. Here we show that precise processing of a diketopyrrolopyrrole-tetrafluorobenzene-based electron transporting copolymer results in single crystal-like and voltage-independent mobility with vanishing activation energy above 280 K. Key factors are uniaxial chain alignment and thermal annealing at temperatures within the melting endotherm of films. Experime

SUBMITTER: Luzio A 

PROVIDER: S-EPMC6662673 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature