Dye sensitized nanostructured photovoltaic tandem cell
The invention provides a device for obtaining an improved efficiency in a photovoltaic, nanostructured, dye sensitized cell structure, comprising a photoactive working electrode, a counter electrode and an electrolyte arranged there-between. The cell structure thereby forms a tandem cell in that the counter-electrode also is a photoactive electrode, whereby the photoactive working electrode and/or the photoactive electrode are built on a transparent substrate. Furthermore, both the photoactive working electrode and the photoactive electrode are made of porous nanostructured film and the photoactive working electrode is dye sensitized with a first dye. The first dye is selected such that the electron injection into the working electrode is so fast that the red-form of a redox-couple in the electrolyte as fast as possible replaces an injected electron. The second dye is selected such that it has a long lived excited state. In this case the material in the counter electrode is comprised of a semiconductor having a large band gap. In an alternative embodiment, the working electrode is dye sensitized corresponding to the first embodiment, whereas the counter electrode is comprised of a semiconductor with a band gap having absorption in the visible and/or IR region, whereby the light absorption in this electrode is further enhanced by a dye having been adsorbed onto the surface of the electrode.
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Alternative title(s) : (fr) Cellule photovoltaique a aspect tandem, nanostructuree et sensible au colorant (en) Dye sensitized nano-structured photo-voltaic tandem cell
Patent number | Country code | Kind code | Date issued |
AU3284199 | AU | A | 1999-12-20 |
WO9963599 | WO | A1 | 1999-12-09 |
SE9801799 | SE | D0 | 1998-05-20 |