This paper is dedicated to the memory of our colleague Prof. Dr. Bert de Boer who passed away January 2009.
Tunable Injection Barrier in Organic Resistive Switches Based on Phase-Separated Ferroelectric–Semiconductor Blends†
Article first published online: 26 AUG 2009
Copyright © 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 19, Issue 19, pages 3173–3178, October 9, 2009
How to Cite
Asadi, K., de Boer, T. G., Blom, P. W. M. and de Leeuw, D. M. (2009), Tunable Injection Barrier in Organic Resistive Switches Based on Phase-Separated Ferroelectric–Semiconductor Blends. Adv. Funct. Mater., 19: 3173–3178. doi: 10.1002/adfm.200900383
- Issue published online: 5 OCT 2009
- Article first published online: 26 AUG 2009
- Manuscript Revised: 5 JUN 2009
- Manuscript Received: 6 MAR 2009
- data storage;
- organic electronics;
- polymeric materials
Organic non-volatile resistive bistable diodes based on phase-separated blends of ferroelectric and semiconducting polymers are fabricated. The polarization field of the ferroelectric modulates the injection barrier at the semiconductor–electrode contact and, hence, the resistance of the comprising diodes. Comparison between the on- and off-current of the switching diodes, with the current measured for semiconductor-only diodes reveals that the switching occurs between bulk-limited, i.e., space-charge-limited, and injection-limited current transport. By deliberately varying the HOMO energy of the semiconductor and the work-function of the metal electrode, it is demonstrated that injection barriers up to 1.6 eV can be surmounted by the ferroelectric polarization yielding on/off current modulations of more than five orders of magnitude. The exponential dependence of the current modulation with a slope of 0.25 eV/decade is rationalized by the magnitude of the injection barrier.