Dye-sensitized solar cells (DSSCs) have received a great deal of attention as low-cost alternatives to conventional p–n junction solar cells.[1] In these cells, the sensitizer is the key component. Although several RuII polypyridyl complexes exhibited high efficiencies above 10% and long-term stability,[2–4] they are quite expensive and hard to purify. Recently, the performance of solar cells based on organic sensitizers has been remarkably improved, ...
