Memory performance of a thin-film device based on a conjugated copolymer containing fluorene and chelated europium complex

Author

Song, Y. ; Ling, Q.D. ; Zhu, C. ; Kang, E.T. ; Chan, D.S.H. ; Wang, Y.H. ; Kwong, D.L.

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore

Volume

27

Issue

3

fYear

2006

fDate

3/1/2006 12:00:00 AM

Firstpage

154

Lastpage

156

Abstract

A memory device based on the sandwiched structure of a conjugated copolymer (PF8Eu), containing fluorene and chelated europium complex, has been fabricated. An electrical bistability phenomenon was observed on this device: low conductivity state for the as-fabricated device and high conductivity state after device transition by applying a voltage of ∼3 V. At the low conductivity state, the device showed a charge injection controlled current and at the high conductivity state, the device showed a space charge limited current. At the same applied voltage, the device exhibited two distinguishable conductivities with an ON/OFF current ratio as high as 10⁶ at room temperature. After transition to the high conductivity state, the device tended to remain in the high conductivity state even when the applied voltage was removed. Thus, the device is a potential write-once-read-many-times memory device.

Keywords

MIM structures; polymer blends; polymer films; space-charge limited devices; thin film devices; write-once storage; MIM sandwich structure; WORM memory device; charge injection controlled current; chelated europium complex; conductivity state; conjugated copolymer; electrical bistability phenomenon; fluorene; space charge limited current; thin film device; write-once-read-many-times memory device; Computer worms; Conducting materials; Conductivity; Electrodes; Indium tin oxide; Microelectronics; Organic materials; Polymers; Thin film devices; Voltage; Electrical bistability; memory effect; polymer; thin-film device;

fLanguage

English

Journal_Title

Electron Device Letters, IEEE

Publisher

ieee

ISSN

0741-3106

Type

jour

DOI

10.1109/LED.2005.864172

Filename

1599464