The 2,2,6,6‐Tetramethyl‐1‐piperidinyloxy Radical: An Efficient,Iodine‐ Free Redox Mediator for Dye‐Sensitized Solar Cells |
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| Authors: | Z Zhang P Chen T?N Murakami S?M Zakeeruddin M Grätzel |
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| Affiliation: | Laboratory for Photonics and Interfaces, Institute of Chemical Sciences and Engineering , école Polytechnique Fédérale de Lausanne, 1015 Lausanne (Switzerland) |
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| Abstract: | A promising redox system, offering an alternative to the widely used iodide/triiodide couple, based on the stable organic radical 2,2,6,6‐tetramethyl‐1‐piperidinyloxy (TEMPO) has been employed in dye‐sensitized solar cells. The photovoltaic performance of this new redox couple has been evaluated by employing nanocrystalline TiO2 films with different thickness. Judicious selections of a 5.0 μm photoanode made from TiO2 mesoscopic particles and an organic sensitizer with a high molar extinction coefficient yield an overall solar‐to‐electric power conversion efficiency of 5.4 % under AM 1.5 illumination at 100 mW cm–2, which is unprecedented for an iodine‐free mediator system. |
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| Keywords: | Electrolytes Power conversion Solar cells Thin films Titania |
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