Molecular Engineering of Organic Sensitizers for High Performance Dye-sensitized Solar Cells

Renaud Demadrille^a, Damien Joly^a, Maxime Godfroy^a, Yann Kervella^a, Laia Pelleja^b, John Clifford^b, Emilio Palomares^b, Frederic Oswald^c, Stephanie Narbey^c, Pascale Maldivi^d

^aINAC/SPrAM UMR 5819 (CEA-CNRS-U.J.F-Grenoble I), 17 rue des martyrs, grenoble, 38054, France

^bInstitute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, Tarragona, Spain

^cSolaronix S.A., Rue de l'Ouriette, 129, Aubonne, Switzerland

^dINAC/SCIB UMR E3 (CEA-U.J.F-Grenoble 1), 17 rue des martyrs, grenoble, 38054, France

International Conference on Hybrid and Organic Photovoltaics
Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)

Ecublens, Switzerland, 2014 May 11th - 14th

Organizers: Michael Graetzel and Mohammad Nazeeruddin

Poster, Damien Joly, 324
Publication date: 1st March 2014

Dye-Sensitized Solar Cell (DSC) technology is seen as a valuable candidate towards energy markets such as BIPV (Building Integrated PhotoVoltaics).[1] In order to improve the performances of DSCs and to increase their commercial attractiveness, one strategy consists in replacing Ruthenium based sensitizers by developing cheap, colorful, stable and highly efficient organic dyes. Indeed organic dyes exhibit many advantages such as higher molar extinction coefficient, tunable colors, and some of them can be prepared easily.[2-3]

We present a new series of purely organic sensitizers based on a push-pull architecture using triarylamine-thiophene as donor and benzothiadiazole-benzene-cyanoacrylic acid as acceptor.[4] Structural modifications were made in order to improve light harvesting and the performances when the dyes are used to sensitize TiO2 electrodes.

Synthetic pathways and impact of chemical modifications on the photophysical properties will be discussed. Photovoltaic performances of devices containing the new dyes and iodide based liquid electrolyte or ionic liquid electrolyte will be presented and discussed. The solar cells based on these new sensitizers demonstrated high efficiencies ranging from 7.8 to 10.2% with liquid electrolyte and 5.8 to 7.9% with ionic liquid based electrolyte. The stability measurements under continuous irradiation (1000W/m²) at 65°C revealing the high stability of the dyes will also be presented.

[1] http://actu.epfl.ch/news/epfl-s-campus-has-the-world-s-first-solar-window/ [2] Haid, S. ; Marszalek, M. ; Mishra, A. ; Wielopolski, M. ; Teuscher, J. ; Moser, J.-E. ; Humphry-Baker, R. ; Zakeeruddin, S. M. ; Grätzel, M. ; Bäuerle, PHaid, S. Et al. Significant Improvement of Dye-Sensitized Solar Cell Performance by Small Structural Modification in π-Conjugated Donor–Acceptor Dyes. Adv. Funct. Mater., 2012, 22, 1291–1302 (2012). [3] Hagfeldt, A, ; Boschloo, G, ; Sun, L.C, ; Kloo, L &, Pettersson, H. Dye-sensitized solar cells. Chem. Rev. 2010, 110 , 6595-6663. (2010). [4] D. Joly, D.; L. Pellejà, L, .; S. Narbey, S.; F. Oswald, F.; J. Chiron, J.; J. N. Clifford, J. N, .; E. Palomares, E.; R. Demadrille, R., A Robust Organic Dye for Dye Sensitized Solar Cells Based on Iodine/Iodide Electrolytes Combining High Efficiency and Outstanding Stability. Sci. Reports, 2014,4, 4033

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International Conference on Hybrid and Organic Photovoltaics

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