Tandem Dye-Sensitized Solar Cells Fabricated on Glass Rod without Transparent Conductive Layers

A tandem dye-sensitized solar cell was fabricated on a glass rod without a transparent conductive oxide layer (TCO-less GR-DSSC). Two model dyes having λ max = 429 nm (Dye II) and λ max = 646 nm (Dye I) respectively were used to examine the potential of the cell. The incident photon to current conversion efficiency (IPCE) curve of the TCO-less GR-DSSC had two peaks at around 490 and 600–650 nm. Open circuit voltage ( V oc ) of the TCO-less GR-DSSC was 1.13 V which was the sum of the V oc (0.57 V) of each single cell. The results strongly demonstrate that the cell has a tandem character.