We have developed an efficient and novel polyene-dye-sensitized nanocrystalline TiO2 solar cells producing a 6.8% solar energy-to-electricity conversion efficiency ([small eta]) under AM 1.5 irradiation (100 mW cm-2): short-circuit current density (Jsc), 12.9 mA cm-2, open-circuit photovoltage (Voc), 0.71 V, fill factor (ff), 0.74.