Highly Reproducible Electric Bistability in an Organic Single Layer Device with Ag Top Electrode
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Highly Reproducible Electric Bistability in an Organic Single Layer Device with Ag Top Electrode Masaya Terai1, Katsuhiko Fujita1,2, and Tetsuo Tsutsui1,2 1 Dept. of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-Koen, Kasuga, 816-8580, Japan 2 Institute for Material Chemistry and Engineering, 6-1, Kasuga-Koen, Kasuga, 816-8580, Japan
ABSTRACT High reproducible electrical bistability was observed and we deliberated its working mechanism through measurements of dynamic dielectric response in single organic layer sandwiched structure using top Ag electrode. The electrical transition between high-impedance state (OFF state) and low-impedance state (ON state) happened by the change of applied voltage patterns. Distinction between the OFF state and the ON state was not induced by change of static charge accumulation but reflected the difference of the response of mobile electric careers in the organic film. We proposed plausible working mechanism of transition from the pristine state to the bistable state. Namely, the electrical bistable state of our device is generated by penetration of Ag nanoparticles and creation of charge pathways across the organic film. INTRODUCTION Electrical bistability are electrical transition from a high-impedance to a low-impedance under applying the same electric fields. Organic electrical bistable devices (OBDs) have been reported in four decades and are considered promising candidates for flexible organic nonvolatile memories and switching devices. A. Szymanki et al. reported an electrical bistability in tetracene film in 1969 [1]. Many researchers have also studied organic active mediums for electrical bistability [2-11]. However, their devices were unstable or reproducibility of their electrical bistability was poor. Plural device constitutions have recently been proposed for achievement of high-performance OBD. Ma et al. (UCLA) reported several OBDs, and one example was the structure of trilayer (organic layer / metal nanoclusters / organic layer) sandwiched between two metal electrodes [12, 13]. The tri-layer device construction has been also reported by Bozano et al. (IBM) [14]. It is noted, however, that electrical behavior of the UCLA device was differed from that of the IBM device, somehow. Although a lot of reports about electrical bistability using organic materials have been published, their working mechanism has been open questions [15-18]. Very recently, we demonstrated the operation of a high-reproducible OBD with the structure of single organic layer interposed between the bottom Al and the top Ag electrodes [19]. Our OBDs work by application of the peculiar voltage patterns. In this paper, we propose the working mechanism of high reproducible electrical bistability in our device. Especially we focus on dynamic dielectric responses of our bistable devices. Measurement of dynamic dielectric response provides helpful information about dynamics of electrical conduction of org
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