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Organic field-effect transistors processed by an environmentally friendly non-halogenated solvent blend

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Abstract

Chlorinated solvents exhibit excellent solubility characteristics for common conjugated molecules and superior physical properties such as adequate viscosity, surface tension and high boiling point, so they are the preferred processing solvent option for realizing high-performance organic devices by cost-effective graphic art printing, despite their known adverse environmental impact. Based on Hansen solubility parameter analysis, this study employed a non-halogenated binary solvent blend of mesitylene and acetophenone to closely mimic the efficiency of dichlorobenzene, a well-known chlorinated solvent for widely used conjugated polymers used in organic field-effect transistors (OFETs) such as poly{[N,N′-bis(2-octyldodecyl)-1,4,5,8-naphthalenediimide-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)} (P(NDI2OD-T2)), 3,6-bis-(5bromo-thiophen-2-yl)-N,N-bis(2-octyl-1-dodecyl)-1,4-dioxo pyrrolo[3,4-c]pyrrole (DPPT-TT) and indacenodithiophene-co-benzothiadiazole (IDT-BT). We tuned the solvent quality of the non-halogenated binary blend in various ratios and studied their effect on polymer pre-aggregation in the solution state, polymer microstructure, and morphological evolution of polymer thin films cast from the solvent blends. High-performance top-gate/bottom-contact OFETs were demonstrated with field-effect mobility values of up to ∼0.574, ∼0.634 and ∼0.785 cm2 V−1 s−1 for P(NDI2OD-T2), DPPT-TT, and IDT-BT polymers, respectively, employing a mesitylene and acetophenone blend (95 : 5 vol%) as a processing solvent.

Graphical abstract: Organic field-effect transistors processed by an environmentally friendly non-halogenated solvent blend

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Publication details

The article was received on 22 Oct 2017, accepted on 16 Dec 2017 and first published on 18 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC04823H
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Organic field-effect transistors processed by an environmentally friendly non-halogenated solvent blend

    H. Opoku, B. Nketia-Yawson, E. Shin and Y. Noh, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C7TC04823H

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