Study of Electrical Conduction Mechanism of Organic Double-Layer Diode Using Electric Field Induced Optical Second Harmonic Generation Measurement

Author:

Nishi Shohei1,Taguchi Dai1,Manaka Takaaki1,Iwamoto Mitsumasa1

Affiliation:

1. Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan

Abstract

By using electric field induced optical second harmonic generation (EFISHG) and current voltage (IV) measurements, we studied the electrical transport mechanism of organic doublelayer diodes with a structure of Au/N, N′-di-[(1-naphthyl)-N, N′-diphenyl]-(1,1′-biphenyl)-4,4′-diamine (α-NPD)/poly(methyl methacrylate) (PMMA)/indium zinc oxide (IZO). Here the α-NPD is a carrier transport layer and the PMMA is an electrical insulating layer. The current level was very low, but the IV characteristics showed a rectifying behavior. The EFISHG measurement selectively and directly probed the electric field across the α-NPD layer, and showed that the electric field across the α-NPD layer is completely relaxed owing to the charge accumulation at the α-NPD/PMMA interface in the region V>0, whereas the carrier accumulation was not significant in the region V<0. On the basis of these experimental results, we proposed a model of the rectification. Further, by coupling the IV characteristics with the EFISHG measurement, the IV characteristics of the diodes were well converted into the current-electric field (IE) characteristics of the α-NPD layer and the PMMA layer. The IE characteristics suggested the Schottky-type conduction governs the carrier transport. We conclude that the IV measurement coupled with the EFISHG measurement is very useful to study carrier transport mechanism of the organic double-layer diodes.

Publisher

American Scientific Publishers

Subject

Condensed Matter Physics,General Materials Science,Biomedical Engineering,General Chemistry,Bioengineering

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