Cross-linked Polymer-Blend Gate Dielectrics through Thermal Click Chemistry.

Shengxia Li, Wei Tang, Weimin Zhang, Xiaojun Guo, Qing Zhang

Index: Chemistry 21 , 17762-8, (2015)

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Abstract

New cross-linking reagents were synthesized and mixed with polystyrene (PS) in solution to form a blend. Thin-films were spin-coated from the blend and then cross-linked by thermal activation at relatively low temperature (100 °C) to form cross-linked gate dielectrics. This new method is compatible with plastic substrates in flexible electronics. The azide and alkyne cross-linking reagents are kinetically stable at room temperature, so any premature cross-linking is avoided during processing. This method also significantly improved the dielectric performances of PS thin films. Solution-processed top-gate organic field-effect transistor devices with indacenodithiophene-benzothiadiazole copolymer as semiconductor layer and the cross-linked PS blend as dielectric layer showed improved performances with lower gate leakages and higher operation stabilities than devices with neat PS film as dielectric layer. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.