Remarkable synergistic effects in a mixed porphyrin dye-sensitized TiO2 film

A remarkable 300% efficiency enhancement driven by a matching increase in the short circuit current was observed in a mixed porphyrin dye-sensitized solar cell constructed from two dyes in a 3: 1 ratio. Absorbed photon-to-current conversion efficiency measurements indicate an improved charge injection yield for both dyes in the mixture. Several possible origins for the observed performance enhancement are discussed. (C) 2011 American Institute of Physics. [doi:10.1063/1.3576904]