  We fabricate photo-anodes by transferring anodic TiO2 nanotube membranes in
tube-top-down configuration on FTO glass, and use them for constructing
frontside illuminated dye-sensitized solar cells. Prior to solar cell
construction, the tube-based photo-anodes are crystallized at different
temperatures (400-800{\deg}C), and the effects of tube electron transport
properties on the photovoltaic performance of the solar cells are investigated.
We show that improved solar cell efficiencies (up to ca. 8.0%) can be reached
by high-temperature treatment of the tube membranes. Consistently with electron
transport time measurements, remarkably enhanced electron mobility is enabled
when tube membranes are crystallized at 600{\deg}C.
