Regulate the Electron Mobility and Threshold Voltage of P(NDI2OD-T2)-Based Organic Field-Effect Transistors by the Compatibility Principle
Journal
Advanced Electronic Materials
Journal Volume
7
Journal Issue
2
Date Issued
2021
Author(s)
Abstract
Blending has been used extensively to meet the requirements for high-mobility organic field-effect transistors (OFETs), involving various combinations of (non-)conjugated polymers and (non-)conjugated molecules. Nonetheless, the collaborative effects of conjugated polymer and its structurally analogous molecule on charge-transport properties have rarely been reported. In this work, P(NDI2OD-T2) and N,N′-bisbutyl-2,6-bis([2,2′]bithiophenyl-5-yl)-1,4,5,8-naphthalene diimide (M), are synthesized and blended with each other. M is designed to resemble the monomeric unit of P(NDI2OD-T2) on the basis of the premise that structural similarity would promote their compatibility in the blends. This compatibility preserves electronic coupling through intermolecular interaction and establishes charge-transport pathways as well. Overall, the thin-film morphology of the blends could be prudently regulated through controlling the blending fraction, resulting in raising electron mobility up to ?0.3 cm2 V?1 s?1. More importantly, this approach reduces threshold voltage by 50%, originating from lowering the injection barrier. These findings are well rationalized and the promising capabilities of the compatibility principle in OFETs are strongly supported. ? 2021 Wiley-VCH GmbH
Subjects
Blending; Carrier transport; Conjugated polymers; Electron mobility; Molecules; Morphology; Threshold voltage; Compatibility principles; Conjugated molecules; Electronic coupling; Injection barriers; Intermolecular interactions; Structural similarity; Thin film morphology; Transport pathways; Organic field effect transistors
Type
journal article