TY - JOUR
T1 - Second Generation of Diketopyrrolopyrrole Dyes for NiO-Based Dye-Sensitized Solar Cells
AU - Farré, Yoann
AU - Zhang, Lei
AU - Pellegrin, Yann
AU - Planchat, Aurelien
AU - Blart, Errol
AU - Boujtita, Mohammed
AU - Hammarström, Leif
AU - Jacquemin, Denis
AU - Odobel, Fabrice
N1 - Funding Information:
ANR is gratefully acknowledged for the financial support of these researches through the program POSITIF (ANR-12-PRGE-0016-01) and R?gion des Pays de la Loire for the project LUMOMAT and Europe for COST CM1202 program (PERSPECT H2O). D.J. acknowledges both the European Research Council (ERC) and the R?gion des Pays de la Loire for financial support in the framework of a Starting Grant (Marches-278845) and a recrutement sur poste strat?gique, respectively. This research has used resources of the GENCICINES/IDRIS and the CCIPL (Centre de Calcul Intensif des Pays de Loire). L.H and L.Z. gratefully acknowledge the Knut and Alice Wallenberg Foundation, the Swedish Energy Agency, The Swedish Research Council for support, and the Chinese Scolarship Council for a doctoral fellowship to L.Z. Nadine Szuwarski is acknowledged for the screen printing of the NiO films on FTO substrates.
PY - 2016/5/5
Y1 - 2016/5/5
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.jpcc.5b12489
DO - 10.1021/acs.jpcc.5b12489
M3 - Article
AN - SCOPUS:84966429161
VL - 120
SP - 7923
EP - 7940
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 15
ER -