Isoindigo dye incorporated copolymers with diselenophenylethene: Synthesis, characterization, and enhanced mobilities in field-effect transistors with electrodes modified by thiol-based self-assembled monolayers

Publication date: 10 March 2017
Source:Polymer, Volume 112
Author(s): Keli Shi, Weifeng Zhang, Xiaotong Liu, Ye Zou, Gui Yu
In this study, we report the design and synthesis of two donor−acceptor isoindigo dye-based copolymers, namely PIIVS1 and PIIVS2, in which π−extended diselenophenylethene building block acts as electron-donating units. The charge transport properties of both copolymers were studied by fabricating field-effect transistors (FETs). The two copolymers-based FETs with electrodes modified by thiol self-assembled monolayers (SAMs) showed enhanced mobilities of up to 1.58 cm² V⁻¹ s⁻¹ (average: 1.28 cm² V⁻¹ s⁻¹), almost two times higher than those achieved in unmodified counterparts. Thereby, a systematical investigation on PIIVS2-based PFETs was performed, indicating contact resistances, contact angles and Au work function all changed in different extents, and more uniform thin film morphologies obtained in thiol-treated PFET devices. The results demonstrate the potential and feasibility of electrodes modification by thiol-based SAMs on improving the device performance of FETs.

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