Abstract
The photoelectric conversion and surface photovoltage spectrum (SPS) of tetrasulfonated gallium phthalocyanine (GaTsPc) molecules self-assembled on a microporous titanium dioxide (TiO 2) electrode are reported. For comparison, the SPS of the GaTsPc sublimed film deposited at 10°C is also presented. The GaTsPc molecule exists mainly in the aggregated form on the microporous TiO 2 electrode and in the sublimed film. The photocurrent action spectrum and SPS have shown that only the absorption of the GaTsPc monomers leads to a photocurrent or photovoltage while GaTsPc cofacial aggregates do not generate a photocurrent and photovoltage. This is attributed to a perpendicular or titled orientation of the molecular planes in the GaTsPc molecular aggregates on the microporous TiO 2 electrode.
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