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Photoelectric Cells of Merocyanine Langmuir-Blodgett Films Utilizing Surface Plasmon Excitations

Published online by Cambridge University Press:  15 March 2011

Keizo Kato ,
Futoshi Takahashi ,
Kazunari Shinbo ,
Futao Kaneko  and
Takashi Wakamatsu
Keizo Kato
Affiliation:
Graduate School of Science and Technology, Niigata University, Ikarashi 2-8050, Niigata 950-2181, JAPAN
Futoshi Takahashi
Affiliation:
Graduate School of Science and Technology, Niigata University, Ikarashi 2-8050, Niigata 950-2181, JAPAN
Kazunari Shinbo
Affiliation:
Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, JAPAN
Futao Kaneko
Affiliation:
Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2-8050, Niigata 950-2181, JAPAN
Takashi Wakamatsu
Affiliation:
Department of Electrical Engineering, Ibaraki National College of Technology, 866 Nakane, Hitachinaka 312-8508, JAPAN
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Abstract

Short-circuit photocurrents (ISC) due to surface plasmon (SP) excitations have been investigated for the photoelectric cells using Langmuir-Blodgett (LB) films of merocyanine (MC) dye. The MC dye exhibits p-type conduction, and the Schottky and Ohmic contacts are obtained at the interfaces between MC LB films and Al thin films and between MC LB films and Ag thin films, respectively. Since the Schottky diodes show the photoelectric effects, the Schottky photoelectric cells have been constructed. The cells with two kinds of structures, that is, prism/Al/MC/Ag (type I) and prism/MgF2/Al/MC/Ag (type II), have been prepared. In the attenuated total reflection (ATR) method, the types I and II have the Kretschmann and both the Kretschmann and Otto configurations, respectively. SP has been resonantly excited at the interface between Ag and air for the type I and at the interfaces between MgF2 and Al between Ag and air for the type II. The ATR and the ISC properties have been simultaneously measured as a function of the incident angles of the laser beams. The peaks of the ISC have corresponded to the resonant angles of the ATR curves. The electric fields and optical absorptions in the cells have been also calculated using the dielectric constants and the film thicknesses obtained from the ATR measurements. The calculated absorptions in the MC layers as a function of the incident angles have corresponded to the results of ISC. It has been estimated that the ISC for both types I and II could be enhanced by the excitations of SP in the ATR configurations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 708: Symposium BB – Organic Optoelectronic Materials, Processing and Devices , 2001 , BB10.43
Copyright
Copyright © Materials Research Society 2002

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