Resistive switching characteristics of polyimides derived from 2,2'-aryl substituents tetracarboxylic dianhydrides

2,2'-Position aryl-substituted tetracarboxylic dianhydrides including 2,2'-bis(biphenyl)-4,4',5,5'-biphenyl tetracarboxylic dianhydride and 2,2'-bis[4-(naphthalen-1-yl) phenyl)]-4,4',5,5'-biphenyl tetracarboxylic dianhydride were synthesized. A new series of aromatic polyimides(PIs) were synthesized via a two-step procedure from 3,3',4,4'-biphenyl tetracarboxylic dianhydride and the newly synthesized tetracarboxylic dianhydrides monomers reacting with 2,2'-bis[4'-(3 ",4 ",5 "-trifluorophenyl)phenyl]-4,4'-biphenyl diamine. The resulting polymers exhibited excellent organosolubility and thermal properties associated with T(g) at 264 degrees C and high initial thermal decomposition temperatures (T(5%)) exceeding 500 degrees C in argon. Moreover, the fabricated sandwich structured memory devices of Al/PI-a/ITO was determined to present a flash-type memory behaviour, while Al/PI-b/ITO and Al/PI-c/ITO exhibited write-once read-many-times memory capability with different threshold voltages. In addition, Al/polymer/ITO devices showed high stability under a constant stress or continuous read pulse voltage of -1.0 V. (C) 2011 Society of Chemical Industry