Effect of Rare-Earth Doping of Anatase on the Performances of Dye Sensitized Solar Cells

Carmen Cavallo^a, Alessandro Latini^a

^aSapienza University of Rome, Piazzale Aldo Moro 5, Roma, 185, Italy

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Carmen Cavallo, 298
Publication date: 5th February 2015

Improvement of the performance of Dye-Sensitized Solar Cells (DSSCs) has been obtained by doping anatase with Er³⁺or Yb³⁺ cations. In this work, the mesoporous TiO₂ samples were synthesized by controlled hydrolysis of titanium isopropoxide and the corresponding rare earth isopropoxide in presence of a templating agent. Structural and morphological characterizations of the materials were performed by XRD and SEM/TEM analyses. The cells prepared using these materials and a non-volatile electrolyte were tested by means of I-V curves under simulated solar radiation (AM 1.5G), electrochemical impedance spectroscopy, dark current and IPCE measurements. The highest performing cell (0.2% Er metal atoms) showed the following photovoltaic performances: a short circuit current density of 16.45 mA cm^-2, an open circuit voltage of 0.731 V and a FF of 0.71 for an overall energy conversion efficiency of 8.7 %. For undoped TiO₂the same parameters were: 0.725 V, 13.99 mA cm^-2, a FF of 0.69 for a conversion efficiency of 7%. A discussion of the obtained results as a function of the dopant and its concentration will be presented.
J vs V polarization curve of DSSC with anatase undoped and doped Er3+ at 0.2%.
Latini, A.; Cavallo, C.;Aldibaja, F.K.;Gozzi, D. Efficiency Improvement of DSSC Photoanode by Scandium Doping of Mesoporous Titania Beads J. Phys. Chem. C, 2013, 117, 25276-25289. Latini, A.; Aldibaja, F.K.; Cavallo, C.; Gozzi, D.Benzonitrile based electrolytes for best operation of dye sensitized solar cells J. Power Sources 269 (2014) 308−316.

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