2012 年 70 巻 5 号 p. 524-540
Dye-sensitized solar cells (DSSCs) have received considerable attention because of high incident solar light-to-electricity conversion efficiency and low cost of production. To increase power conversion efficiency of DSSCs, it is important to develop the effective organic dye sensitizers. For this purpose, as a new class of donor-π-acceptor (D-π-A) dye sensitizers for DSSCs, we have designed and synthesized a series of D-π-A fluorescent dyes with carboxyl groups on different positions of a chromophore skeleton or with pyridine ring as electron-withdrawing-injecting anchoring group. On the basis of experimental results and MO calculations, we propose that, for developing high performance DSSCs, it is necessary to create an epoch-making molecular design capable of controlling not only photophysical and electrochemical properties of the dyes themselves but also molecular arrangement and/or orientation of the dyes on TiO2 surface to provide a good electron communication between the dyes and TiO2 electrode.