This article compares the electronic transport properties of dye-sensitized solar cells using a liquid electrolyte with those of one using an organic hole conductor. Both types of solar cells differ by the reference energies for recombination and, in particular, by their recombination probabilities of photoinjected electrons from the titanium dioxide into the respective contact medium. For voltages below 0.8 V, the junction impedance of the electrolyte cell is dominated by diffusion and recombination of electrons from the TiO 2 into the electrolyte. The impedance of the solid state exhibits a negative reactance, that is, an inductive behavior, which we attribute to conductivity modulation of the hole conductor by injected electrons.
Studies on the spin distribution in the radical state of anthracene-a bridgeviologen supermolecules with different bridge units are reported. Electronnuclear double resonance experiments (ENDOR) were performed on electrochemically reduced molecules. Proton hyperfine coupling constants at different molecular sites were obtained and are discussed in detail. The experimentally determined values are compared with quantum chemical calculations of the INDO type. The observed spin distribution depends significantly on the type of the bridging unit. The relevance of the spin distribution for electron transfer in donor-bridge-acceptor molecular complexes is discussed.
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