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所属单位：材料科学与技术学院

发表刊物：MACROMOLECULAR CHEMISTRY AND PHYSICS

关键字：charge-transfer dynamic random access memory polyimides rewritable

摘要：A novel asymmetric carbazole-based diamine (9-((4-(9H-carbazolyl)-[1,1-biphenyl])methyl)-3,6-diaminocarbazole (BCDA-CBZ)) is synthesized and characterized. Two aromatic conjugated polyimides (PI-a and PI-b) are prepared via a two-step procedure using BCDA-CBZ reacting with 2,2,3,3-biphenyl-tetracarboxylic dianhydride (i-BPDA) and 2,2-bis(4-phenyl)-4,4,5,5-biphenyltetracarboxylic dianhydride (DPBPDA), respectively. The resulting PIs possess excellent organo-solubility, are thermally stable, and have film-formation ability. The Al/PI-a/ITO exhibits a dynamic random access memory behavior, whereas the Al/PI-b/ITO presents a rewritable type memory capability. The fabricated PI-a device shows low turn-on threshold voltages at -1.47 and +2.85V, and the switching voltages of PI-b device are -2.07 (turn-on) and +2.85V (turn-off). The electrical conduction behaviors are analyzed using theoretical models based on the experimental data. The molecular simulation by density functional theory calculations suggests that field-induced charge-transfer and the conformation change mechanism could be used to explain the memory characteristics.

ISSN号：1022-1352

是否译文：否

发表时间：2018-09-01

合写作者：Yang, Yanhua,Jin, Pan,Ding, Shijin,Chu, Yueying

通讯作者：沈应中