PC 26

COMPARISON OF OPERATING MECHANISMS FOR THE POLY(N-VINYLCARBAZOLE)-BASED NON-VOLATILE MEMORY DEVICES

J.-S. Choi, Y.S. Cho, D.H. Suh^*

Department of Chemical Engineering, Hanyang University, Seoul 133–791, Korea

^* e-mail : dhsuh@hanyang.ac.kr

The organic electronics, which include organic light emitting diodes (OLEDs), organic thin film transistors (OTFTs), and organic solar cells have been extended to the non-volatile memory devices (NVMs). Even though the various NVMs were proposed, it is difficult to classify their operating mechanisms because of the different active materials. Therefore, we investigate the major fabrication parameters and the operating properties of poly(N-vinylcarbazole) (PVK) based NVMs which are made of the different structures of the various cells. Each device has shown the distinct features such as a “filament” mechanism with write-only-read-many device characteristics, a “space-charge limited current” mechanism by the internal thin metal layer and a “charge transfer” mechanism between two organic moieties. Particularly, the device made from showing the charge transfer mechanism has the unique properties such as the bistability, more than 3 orders of the On/Off ratio at 1V and the reversible switching properties by the external electric field.