Photovoltaic properties of a liquid crystal porphyrin solid film

Optoelectric properties of a novel liquid crystal zinc tetraphenyltetrabenzoporphyrin (ZnTPTBP) is studied with the aid of surface photovoltaic spectroscopy (SPS) and electric-field-induced SPS. The surface photovoltage response at 550 nm under external field is assigned to the π–π∗ transmission in the columns of micro π system formed in ZnTPTBP solid film and is thought to be related with the electro-optical memory effect of liquid crystal porphyrin.