A Hybrid Tandem Solar Cell Combining a Dye-Sensitized and a Polymer Solar Cell.

A hybrid tandem solar cell was assambled by connecting a dye sensitized solar cell and a polymer solar cell in series. A N719 sensitized TiO2 was used as photocathode in dye-sensitized subcell, and a MEH-PPV/PCBM composite was used as active layer in the polymer subcell. The polymer subcell fabricated on the counter electrode of the dye sensitized solar cell. A solution processed TiOx layer was used as electron collection layer of the polymer sub cell and the charge recombination layer. The effects of the TiOx interlayer and the spectral overlap between the two sub cells have been studied and optimized. The results shows that a proper thickness of the TiOx layer is needed for tandem solar cells. Thick TiOx will enhance the series resistance, but too thin TiOx layer will damage the hole blocking effect and its hydrophilic. The resulting optimized tandem solar cells exhibited a power conversion efficiency of 1.28% with a V-oc of 0.95 V under simulated 100 mW cm(-2) AM 1.5 illumination.