Abstract
Results and analyses are reported on the dye-sensitized steady-state photo-conduction through metal-dye-SiO 2-metal (MDIM) structures, and on the photo-induced discharge of MDIM capacitors. In all the experiments the dye used was hydrogen phthalocyanine. The induced photo-current is substantial when the dye contact is negatively biased but is is negligible under positive bias, i.e. it appears that electron currents are fairly readily induced but not hole currents. Measurements as a function of temperature have included thermally-stimulated dielectric relaxation experiments and the results provide evidence for separate regimes of bulk- and electrode-dominated processes. The voltage dependence of the dark current and of the photo-current obeys an equation of the Poole-Frenkel type. The rate of discharge of MDIM capacitors increase markedly on illumination but, unlike the photo-current, there is no significant dependence on polarity. The photo-induced discharge rate varies with wavelength and its spectral dependence matches the photo-conduction spectrum of the dye, as does the dye-sensitized photo-current.
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