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Development of High-k Polymer Materials for Use as a Dielectric Layer in the Organic Thin-Film Transistors

Zou, Jiawei, Wang, He, Shi, Zuosen, Hao, Xiaojuan, Yan, Donghang, Cui, Zhanchen
Journal of physical chemistry 2019 v.123 no.11 pp. 6438-6443
dielectrics, films (materials), insulating materials, physical chemistry, polymers, transistors, vanadyl ions
In this article, we developed a series of novel high dielectric polymers based on 5-TPM-co-HEMA-co-GMA (TP) and 5-CTPM-co-HEMA-co-GMA (TP–CN) containing alkylated terphenyl and alkylated terphenyl with a cyano group, respectively. These organic insulating materials provide smooth surface topographies, lower leakage current densities (<6 × 10–⁷ A/cm² at 2 MV/m), and small dielectric loss (<0.02, 10³ to 10⁵ Hz), which display excellent insulating properties. Simultaneously, two kinds of polymer films have higher dielectric constants of 6.8 and 8.6 than other dielectric constants reported in some literatures and most commercial organic dielectric materials. To investigate the potential of TP and TP–CN as gate dielectrics, we successfully prepared bottom-gate top-contact organic thin-film transistors, with para-hexaphenyl (p-6P) as the buffer layer and vanadyl phthalocyanine (VOPc) as the active layer, which yields a higher charge carrier mobility of 0.52 cm² V–¹ s–¹ and on/off ratio > 10⁴.