A Facile Photo-cross-linking Method for Polymer Gate Dielectrics and Their Applications in Fully Solution Processed Low Voltage Organic Field-effect Transistors on Plastic Substrate

作者：Liu, Ying; Zhao, Jia-Qing; Sun, Wen-Jian; Huang, Yu-Kun; Chen, Su-Jie; Guo, Xiao-Jun^*; Zhang, Qing^*

来源：Chinese Journal of Polymer Science, 2018, 36(8): 918-924.

DOI：10.1007/s10118-018-2110-2

• Organic field-effect transistors
• Solution processed
• Polymer dielectric
• Cross-linking
• Photochemistry

A simple and effective photochemical method was developed for cross-linking of polymer gate dielectrics. Laborious synthetic processes for functionalizing polymer dielectrics with photo-cross-linkable groups were avoided. The photo-cross-linker, BBP-4, was added into host polymers by simple solution blending process, which was capable of abstracting hydrogen atoms from polymers containing active CaEuro center dot H groups upon exposure to ultraviolet (UV) radiation. The cross-linking can be completed with a relatively long wavelength UV light (365 nm). The approach has been applied to methacrylate and styrenic polymers such as commercial poly(methylmethacrylate) (PMMA), poly(iso-butylmethacrylate) (PiBMA) and poly(4-methylstyrene) (PMS). The cross-linked networks enhanced dielectric properties and solvent resistance of the thin films. The bottom-gate organic field-effect transistors (OFETs) through all solution processes on plastic substrate were fabricated. The OFET devices showed low voltage operation and steep subthreshold swing at relatively small gate dielectric capacitance.

• 出版日期2018-8
• 单位上海交通大学