Rewritable and Non‐Volatile Memory Effects Based on Polyimides Containing Pendant Carbazole and Triphenylamine Groups

• DOI: 10.1002/macp.201100373
• Publication Date: 2011-09-19T06:11:30Z
• Authors: Yueqin Li; Runchen Fang; Shijin Ding; Yingzhong Shen
• Keywords: 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

AbstractAs part of a strategy to explore highly functionalized macromolecular semiconductors, two novel polyimides consisting of electron‐donating carbazole and triphenylamine side groups are synthesized and characterized. Polyimide films sandwiched between an indium‐tin oxide (ITO) bottom electrode and Al top electrode exhibit two accessible conductivity states and can be switched from the low‐conductivity state to the high‐conductivity state. Memory devices with the configuration of Al/PI(CzBD‐DPBPDA)/ITO exhibit bipolar flash‐type memory characteristics while that of Al/PI(TPABD‐DPBPDA)/ITO demonstrate excellent unipolar ON and OFF switching behavior. Both devices show high ON/OFF current ratios up to 104 and long retention times of 104 s in ambient atmosphere.