Photovoltage study of charge injection from dye molecules into transparent hole and electron conductors

Abstract

Transient and spectral photovoltage PV have been investigated for charge injection from a dye Ru dcbpyH2 2 NCS 2 into transparent hole CuSCN, CuI, CuAlO2 and electron TiO2, SnO2 F conductors. The PV signal rises to a maximum within 10 ns to 10 s, depending on the transparent hole or electron conductor and on the mechanism of charge separation. The efficiency of hole and electron injection is of the same order while the effective lifetimes of injected charge vary between 100 ns and 1 ms for the samples used. The injection thresholds range between 1.2 and 1.8 eV and depend sensitively on the material on which the dye is adsorbe