Studies on surface photovoltaic properties of palladium tetramethyl tetraethyl porphyrin

The surface photovoltaic properties of tetramethyltetraethyl porphyrin (TMT EP) and palladium tetramethyltetraethyl porphyrin (PdTMTEP), which was synt hesized by using improving technique, was studied by surface photovoltage s pectra (SPS) and field induced surface photovoltage spectra (FISPS). The ph otovoltaic response intensity of PdTMTEP is much stronger than that of TMTE P since PdTMTEP shows a strong phosphorescence and weak fluorescence, The p hotovoltaic response intensity of Soret band and Q band for PdTMTEP are enh anced with an external positive electric field and weakened with a negative electric field, Moreover two new photovoltaic response bands appear at 680 and 750 nm, which are related to the transition of polaron.