Synthesis and memory properties of a conjugated copolymer of fluorene and benzoate with chelated europium complex
Song, Y. Tan, Y.P. Teo, E.Y.H. Zhu, C. Chan, D.S.H. Ling, Q.D. Neoh, K.G. Kang, E.T.
Song, Y.
Tan, Y.P.
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Abstract
A conjugated copolymer of diethylhexylfluorene and europium complex-chelated benzoate (PF8Eu) was synthesized. The device based on an Al/PF8Eu/indium-tin-oxide sandwich structure exhibited nonvolatile, write-once read-many-times (WORM) memory behavior. The fluorene moiety served as the backbone and electron donor, while the europium complex served as the electron acceptor. The as-fabricated device was in its low conductivity state. After applying a voltage of ∼3 V, the device underwent a transition to the high conductivity state, which could not be erased by a reverse bias. In the initial low conductivity state, the device showed a charge injection controlled current. At the high conductivity state, the current-voltage characteristics were dominated by a space-charge-limited current. The device had a switching time of ∼1 μs and an on/off current ratio as high as 106. No degradation in device performance was observed after 107 read cycles at a read voltage of 1 V under ambient conditions. The device also exhibited good stability under a constant 1 V stress. Thus, the device based on PF8Eu is potentially useful as a WORM memory. © 2006 American Institute of Physics.
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Journal of Applied Physics
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Date
2006
DOI
10.1063/1.2362982
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Article