Synthesis of triazines containing porphyrin as photoactive compounds for solar cells

Abstract

Porphyrins as light harvesters in optoelectronic device are useful for their extremely high potential absorption coefficients excellent change mobility, and relative ease with which a variety of covalent and non-covalent bonding possibilities. This research described the synthesis of a series of porphyrinic compounds, investigation of their electrochemical and photophysical properties, and fabrication/evaluation of solar cells based on these compounds. The target molecules include two or three porphyrin macrocycles connected via triazine units. When two porphyrin macrocycles are presented, the remaining peripheral position on the triazine ring is taken by a 4-carboxyphenyl group or 4-(2-carboxy-2-cyanoethenyl)phenyl anchoring group or carbamyl group. Introduction of more than one porphyrin macrocycle enhances the light-harvesting efficiency of these compounds. Triazinesare known to be good charge transporters. Cyclic voltammograms of these compounds were recorded to obtain HOMO-LUMO energy levels, and the film morphology was investigated as well. According to finding from these studies, organic photovoltaic cells were prepared and light-to-electrical energy conversion efficiencies of the resulting devices were evaluated.