11% efficiency solid-state dye-sensitized solar cells with copper(II/I) hole transport materials

Yiming Cao, Yasemin Saygili, Amita Ummadisingu, Joël Teuscher, Jingshan Luo, Norman Pellet, Fabrizio Giordano, Shaik Mohammed Zakeeruddin, Jacques -E. Moser, Marina Freitag (), Anders Hagfeldt () and Michael Grätzel ()
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Yiming Cao: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Yasemin Saygili: Laboratory of Photomolecular Science, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Amita Ummadisingu: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Joël Teuscher: Photochemical Dynamics Group, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Jingshan Luo: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Norman Pellet: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Fabrizio Giordano: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Shaik Mohammed Zakeeruddin: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Jacques -E. Moser: Photochemical Dynamics Group, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Marina Freitag: Laboratory of Photomolecular Science, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Anders Hagfeldt: Laboratory of Photomolecular Science, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne
Michael Grätzel: Laboratory of Photonics and Interfaces, Institute of Chemical Sciences & Engineering, École Polytechnique Fédérale de Lausanne

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Solid-state dye-sensitized solar cells currently suffer from issues such as inadequate nanopore filling, low conductivity and crystallization of hole-transport materials infiltrated in the mesoscopic TiO2 scaffolds, leading to low performances. Here we report a record 11% stable solid-state dye-sensitized solar cell under standard air mass 1.5 global using a hole-transport material composed of a blend of [Cu (4,4′,6,6′-tetramethyl-2,2′-bipyridine)2](bis(trifluoromethylsulfonyl)imide)2 and [Cu (4,4′,6,6′-tetramethyl-2,2′-bipyridine)2](bis(trifluoromethylsulfonyl)imide). The amorphous Cu(II/I) conductors that conduct holes by rapid hopping infiltrated in a 6.5 μm-thick mesoscopic TiO2 scaffold are crucial for achieving such high efficiency. Using time-resolved laser photolysis, we determine the time constants for electron injection from the photoexcited sensitizers Y123 into the TiO2 and regeneration of the Y123 by Cu(I) to be 25 ps and 3.2 μs, respectively. Our work will foster the development of low-cost solid-state photovoltaic based on transition metal complexes as hole conductors.

Date: 2017
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DOI: 10.1038/ncomms15390

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