ENERGY-DEPENDENCE OF DYE SENSITIZED CHARGE CARRIER INJECTION INTO ORGANIC-CRYSTALS

A plateau extending over 0.7 eV and a sudden decrease by three orders of magnitude in the yield of hole injection through 1D* rhodamine B has been observed when the ionization energy of the organic electrode was varied over 1 eV, using perylene, anthracene, chrysene, phenanthrene and naphthalene crystals. The experimental result agrees with some basic assumptions which are made when applying electron transfer theory to an excited dye molecule at the interface between an aqueous solution and an insulator or semiconductor. The measured energy dependence illustrates the expected non-linear relationship between the photocurrent and the rate constant of electron transfer to the excited dye molecule. © 1979.