writer：Ye Tian, Ying Song, Hongyan Yao, Huaxuan Yu, Haiwei Tan, Ningning Song, Kaixiang Shi, Bo Zhang, Shiy
keywords：Hyperbranched polyimide, Memory materials
source：期刊
specific source：Dyes and Pigments
Issue time：2018年
Two novel solution-processable polyimide (PI-6FDA) and co-polyimide (CoPI-6FDA), with triphenylamine(TPA)-derived structure as electron donor units and trifluoromethyl-containing phthalimide as electron acceptorunits, were designed and synthesized for polymer memory device application. The TPA branched structure wasintroduced into the CoPI-6FDA to modify the performance of the polymer memory devices. Compared with PI-6FDA, CoPI-6FDA based memory devices exhibit better memory performance in lower threshold voltage of?3.1 V, higher ON/OFF current ratios of 105, and better operation stability and charge transfer complex sta-bility. The effect of TPA branched structures on memory performance has been further explored by optoelec-tronic measurements and theoretical calculation. Moreover, the optical and electrochemical measurements re-veal the charge transfer mechanism of the CoPI-6FDA and PI-6FDA, which is related to the electrical bistability.The introduction of TPA branched structures was proved as a suitable strategy to fabricate the polymer memorydevices with high performance.