Second Generation of Diketopyrrolopyrrole Dyes for NiO-Based Dye-Sensitized Solar Cells

Yoann Farré, Lei Zhang, Yann Pellegrin, Aurelien Planchat, Errol Blart, Mohammed Boujtita, Leif Hammarström, Denis Jacquemin, Fabrice Odobel

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Abstract

In this study, four new diketopyrrolopyrrole (DPP) sensitizers, with a dicarboxylated triphenylamine anchoring group for attachment to NiO, were prepared and their electronic absorption, emission and electrochemical properties were recorded. The nature of the electronic excited-states was also modeled with Time-Dependent Density Functional Theory (TD-DFT) quantum chemistry calculations. The photovoltaic performances of these new dyes were characterized in NiO-based dye-sensitized solar cells (DSCs) with the classical iodide/triiodide and cobalt(II/III)-polypyridine electrolytes, in which they proved to be quite active. Laser spectroscopy on dye/NiO/electrolyte films gave evidence for ultrafast hole injection into NiO (0.2-10 ps time scales). For the dyes with an appended naphtalenediimide (NDI) acceptor unit, ultrafast electron transfer to the NDI dramatically prolonged the lifetime of the charge separated state NiO+/dye-, from the ps time scale to an average lifetime ≈0.25 ms, which is among the slowest charge recombinations ever reported for dye/NiO systems. This allowed for efficient regeneration by CoIII-polypyridine electrolytes, which translated into much improved PV-performance compared to the DPP dyes without appended NDI. Overall, these results underscore the suitability of DPP as sensitizers for NiO-based photoelectrochemical devices for photovoltaic and photocatalysis.

Original languageEnglish
Pages (from-to)7923-7940
Number of pages18
JournalJournal of Physical Chemistry C
Volume120
Issue number15
DOIs
Publication statusPublished - May 5 2016

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Farré, Y., Zhang, L., Pellegrin, Y., Planchat, A., Blart, E., Boujtita, M., Hammarström, L., Jacquemin, D., & Odobel, F. (2016). Second Generation of Diketopyrrolopyrrole Dyes for NiO-Based Dye-Sensitized Solar Cells. Journal of Physical Chemistry C, 120(15), 7923-7940. https://doi.org/10.1021/acs.jpcc.5b12489