| 초록 |
Photoinduced electron transfer in the initial process of biological photosynthesis was applied to construct the molecular photodiode complex consisted of Lanmuir-Blodgett films with electron donor(D), electron sensitizer(S), electron relay(R) and electron acceptor(A). Diode property and inter molecular switching function were investigated. We used Ferrocene derivatives as a donor, Flavin as a sensitizer, Viologen as a electron relay and TCNQ derivatives as an electron acceptor. The energy levels of each material were found by cyclic voltammetry. One-way electron transfer was found to depend on the redox potential difference and to the wavelength of excited state and excimer formation was investigated. By arranging four materials on ITO glass electrode regularly in space normal to the electrode surface, e.g., D/S/R/A, by Langmuir-Blodgett technique. Finally depositing Al electrode on LB films through vacuum evaporator, Metal(M, ITO)/Insulator(I, LB films)/Metal(M, Al), called MIM device was constructed.In this study, we suggested D/S/R/A system on the purposes of reducing charge recombination and super-sensitizing effect. The photo-initiated vectorial flow of electrons due to redox potential difference could be achieved and photoswitching function and diode characteristics were achieved in MIM device. The model of D/S/R/A system had good characteristics than other models in photodiode property.
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