A Photoelectric Property of Merocyanine LB Film Cell Utilizing Surface Plasmon Polariton Excitation (Special Issue on Organic Molecular Electronics for the 21st Century)

概要

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Short-circuit photocurrents (I_<SC>) utilizing surface plasmon polariton (SPP) excitation were investigated for the merocyanine (MC) LB film photoelectric device. The device has a prism / MgF_2 / Al / MC LB film / Ag structure. In the attenuated total reflection (ATR) configuration, SPPs were resonantly excited at the interfaces between MgF_2 and Al(MgF_2 / Al) and between Ag and air (Ag / air). The thickness and the dielectric constants of the layers were evaluated from the ATR measurements. Short-circuit photocurrents. I_<SC>s, as a function of the incident angle of the laser beam were observed simultaneously during the ATR measurements. In the I_<SC>curves, large and small peaks were observed, and the peak angles of the I_<SC>almost corresponded to the dip angles of the ATR curves due to the SPP excitations. Electric fields and optical absorptions in the cell were calculated using the dielectric constants and the film thickness obtained from the ATR measurements. The calculated absorption in the MC layer as a function of the incident angle corresponded to the I_<SC>curve. It was thought that the optical absorption in the MC layer affected directly to the profile of the I_<SC>. Furthermore, the calculated absorption in the cell with the prism and the MgF_2 layer exhibited much larger than that of the cell without them. It was estimated that the photocurrents were enhanced by the excitation of SPPs in the ATR configuration.
2000-07-25