Tandem Dye-Sensitized Solar Cells Consisting of Nanoporous Titania Sheet

概要

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Tandem dye-sensitized solar cells consisting of two electrodes in one cell are reported. A tandem cell (Cell TAN GF or Cell TAN St) has a floating electrode (bottom cell) and a TiO2 electrode prepared on a F-doped SnO2 glass substrate (top cell). The floating electrode is a flexible and self-standing composite film consisting of a porous titania/dye layer supported by a glass mesh sheet or a stainless-steel mesh sheet. The incident photon-to-current conversion efficiency (IPCE) curves for Cell TAN GF and Cell TAN St had two peaks corresponding to the visible absorption of the two dyes. The open circuit voltages ($V_{\text{oc}}$) of Cell TAN GF and Cell TAN St were 0.82 and 0.88 V, respectively, which were higher than that of the corresponding single cell (0.6–0.64 V). These results demonstrated that both Cell TAN GF and Cell TAN St can be used as tandem cells. The fact that the $V_{\text{oc}}$ of Cell TAN GF is almost the same as that of Cell TAN St leads to the conclusion that a conductive layer is not necessarily needed for the bottom electrode.
2010-08-25