The photoelectric conversion of the dichromophore quinolinium dye from the monolayer modified ITO electrode

Two dichromophore dye molecules, 4,4′-di-{1-[1-(N,N-dioctadecaneamino)phenylethylquinolinium bromine]-propyl}-dipyridinium bromine (QMV3) and 4,4′-di-{1-[1-(N,N-dioctadecaneamino)phenylethylquinolinium bromine]-octyl}-dipyridinium bromine (QMV8) were synthesized and transferred onto an ITO electrode using the Langmuir–Blodgett (LB) technique. The photocurrent generation was investigated versus applied electrode potential, concentration of the electron acceptors or donor, and pH of the electrolyte. A mechanism of light-induced electron injection is proposed.