title: Dramatic inversion of charge polarity in diketopyrrolopyrrole-based organic field-effect transistors via a simple nitrile group substitution.
abstract: A record-breaking high electron mobility of 7.0 cm(2) V(-1) s(-1) for n-channel polymer OFETs is reported. By the incorporation of only one nitrile group as an electron-withdrawing function in the vinyl linkage of the DPP-based copolymer, a dramatic inversion of majority charge-carriers from holes to electrons is achieved.
authors.affiliation: School of Materials Science and Engineering & Research Institute for Green Energy Convergence Technology (REGET), Gyeongsang National University, Jinju, 660-701, South Korea.
authors.forename: Hui-Jun
authors.initials: HJ
authors.lastname: Yun
authors.forename: Seok-Ju
authors.initials: SJ
authors.lastname: Kang
authors.forename: Yong
authors.initials: Y
authors.lastname: Xu
authors.forename: Seul Ong
authors.initials: SO
authors.lastname: Kim
authors.forename: Yun-Hi
authors.initials: YH
authors.lastname: Kim
authors.forename: Yong-Young
authors.initials: YY
authors.lastname: Noh
authors.forename: Soon-Ki
authors.initials: SK
authors.lastname: Kwon
keywords: charge trapping effect; conjugated polymers; diketopyrrolopyrrole; electron-withdrawing groups; n-type organic field-effect transistors