Abstract
E-mail: hong5506@incheon.ac.krReceived March 17, 2014, Accepted July 9, 2014In this article, we have designed and synthesized a novel donor-π-acceptor (D-π-A) type porphyrin-basedsensitizer (denoted UI-5), in which a carboxyl anchoring group and a 9,9-dimethyl fluorene were introduced atthe meso-positions of porphyrin ring via phenylethynyl and ethynyl bridging units, respectively. Long alkoxychains in ortho-positions of the phenyls were supposed to reduce the degree of dye aggregation, which tendsto affect electron injection yield in a photovoltaic cell. The cyclic voltammetry was employed to determine theband gap of UI-5 to be 1.41 eV based on the HOMO and LUMO energy levels, which were estimated by theonset oxidation and reduction potentials. The incident monochromatic photon-to-current conversion efficiencyof the UI-5 DSSC assembled with double-layer (20 nm-sized TiO
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