Photoelectric properties of amphiphilic porphyrin Langmuir–Blodgett film

The photovoltaic behavior of an electrochemical cell of TC 16 PyP(4) monolayer, deposited on SnO 2 optically transparent electrodes (SnO 2 OTE) by the Langmuir–Blodgett (LB) technique was investigated. The photocell was able to generate photocurrent, which increase in the presence of electron donors or acceptors in the KCl electrolyte solution, indicating that the photovoltaic effect of TC 16 PyP(4) perhaps originates from the photo-induced charge transfer between TC 16 PyP(4) molecules and SnO 2 semi-conductor. Moreover, the orientation of TC 16 PyP(4) in monolayer or LB films was also studied by π –A isotherm and polarized absorption spectrum. The result showed that the porphyrin macroring was oriented with an angle of about 25° against the aqueous surface as well as the substrate plane.