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Memory Effect in Organic Diodes Containing Self-assembled Gold Nanoparticles

Published online by Cambridge University Press:  01 February 2011

Hai Ping Wang ,
Sébastien Pigeon ,
Ricardo Izquierdo  and
Richard Martel
Hai Ping Wang
Affiliation:
hai.ping.wang@umontreal.ca, Université de Montréal, chimie, C.P. 6128 Succursale Centre-ville, Montreal, H3T 1J4, Canada
Sébastien Pigeon
Affiliation:
Sébastien Pigeon s.pigeon@novimage.ca, OLA Display Corp, 1000 St-Antoine Ouest, suite 106, Montréal, H3C 3R7, Canada
Ricardo Izquierdo
Affiliation:
izquierdo.ricardo@uqam.ca, Université du Québec á Montréal, Département d'informatique, Case postale 8888, Succursale Centre-ville, Montréal, H3C 3P8, Canada
Richard Martel
Affiliation:
r.martel@umontreal.ca, Université de Montréal, Regroupement Québécois sur les Matériaux de Pointe et département de Chimie, C.P. 6128 Succursale Centre-ville, Montréal, H3T 1J4, Canada
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Abstract

Electrical bistability is reported in metal-organic-metal diodes. The device consists of two Al electrodes separated by an organic layer that contains embedded Au nanoparticles (NPs) supported by parylene nanopillars. This paper presents results with two different organic materials: 2-amino-4, 5-imidazoledicarbonitrile (AIDCN) and aluminum tris(8-hydroxyquinoline) (Alq3). Electrical characterization of the diodes shows bistability with two well-defined states with high (OFF) and low (ON) resistances. The ON/OFF ratio is 104 and current-voltage (I-V) curves show a negative differential resistance (NDR). The diodes can be programmed in either the ON or the OFF state and maintained it for at least 8 months in air without any evidence of degradation. This conspicuous memory effect is rationalized in terms of charge storage mediated by the oxidation/reduction of the NPs. The fabrication method is general and provides a good control on both the size-uniformity and the position of the Au NPs embedded in the organic materials. The diode characteristics with different NP density are also addressed.

Keywords

memoryorganicdevices
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 997: Symposium I – Materials and Processes for Nonvolatile Memories II , 2007 , 0997-I01-02
Copyright
Copyright © Materials Research Society 2007

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