Web Release Date: January 24,
An Effective Friedel-Crafts Postfunctionalization of Poly(N-vinylcarbazole) to
Tune Carrier Transportation of Supramolecular Organic Semiconductors
Based on 
-Stacked Polymers for Nonvolatile Flash Memory Cell
and
Jiangsu Key Lab of Organic Electronics & Information Displays and Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications, 66 XinMofan Road, Nanjing 210003, China, and Institute of Advanced Materials (IAM), Fudan University, 220 Handan Road, Shanghai 200433, China
Received September 6, 2007
Abstract:
Poly(N-vinylcarbazole) (PVK) and its derivatives are -stacked polymers of the most important supramolecular organic semiconductors (SOSs), in which semiconducting features are originated from intra-supramolecular interactions. An effective Friedel-Crafts method has been developed to postfunctionalize PVK to a PVK-PF SOS and to tune the fundamental electronic structures and transporting properties of the resulting SOS. Stable nonvolatile flash memory effect from the SOS has been demonstrated in an ITO/PVK-PF/metal sandwich device. The device exhibited an ON/OFF current ratio up to 104, and writing/erasing voltages around +2.2/-2.0 V, respectively. The unique electrical bistability can be attributed to the ordering alignment effect induced by electric field and the hindrance effect arisen from bulky moieties. Thus, PVK-containing complicated 9,9-diarylfluorenes (CDAFs) are promising materials for information storage applications.
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