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

Lookup NU author(s): Professor Marina FreitagORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

© The Author(s) 2017. Solid-state dye-sensitized solar cells currently suffer from issues such as inadequate nano-pore 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 mm-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 ms, respectively. Our work will foster the development of low-cost solid-state photovoltaic based on transition metal complexes as hole conductors.

Publication metadata

Author(s): Cao Y, Saygili Y, Ummadisingu A, Teuscher J, Luo J, Pellet N, Giordano F, Zakeeruddin SM, Moser J-E, Freitag M, Hagfeldt A, Grätzel M

Publication type: Article

Publication status: Published

Journal: Nature Communications

Year: 2017

Volume: 8

Online publication date: 09/06/2017

Acceptance date: 27/03/2017

Date deposited: 08/01/2020

ISSN (electronic): 2041-1723

Publisher: Nature Publishing Group

URL: https://doi.org/10.1038/ncomms15390

DOI: 10.1038/ncomms15390

PubMed id: 28598436

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