Opal-like photoanodes with photonic effects in macroporous perovskite solar cells
Jennifer Dewalque a, Damien Baron b, Gilles Spronck a, Audrey Schrijnemakers a, Anthony Maho a c, Pierre Colson a, Rudi Cloots a, Jérôme Loicq b, Catherine Henrist a
a GREENMAT - CESAM, University of Liège, Allée du 6 Août 13, Sart-Tilman, 4000 Liège, Belgium
b University of Liege, CSL, Liege Science Park, Avenue du Pré-Aily, 4031 Angleur, Belgium
c Fonds de la Recherche Scientifique (FNRS), Belgium.
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
Perovskite Thin Film Photovoltaics (ABXPV18). 27-28 Feb
Rennes, France, 2018 February 27th - March 1st
Organizer: Jacky Even
Poster, Jennifer Dewalque, 103
Publication date: 11th December 2017

Organic-inorganic metal halide perovskite compounds, used either in mesoscopic or planar solar cells architectures, have allowed preparing highly efficient solid-state devices (>20%).

In mesoscopic solar cells, a mesoporous TiO2 scaffold is incorporated into the cells. However, because of the small pore size compared to the wavelengths of visible light, the scaffold barely scatters light.

 

In this work, we propose to design periodically structured TiO2 scaffold from colloidal crystal templating fabrication method. Polystyrene beads with diameters comparable to visible light wavelengths are used as structuring agent. The resulting opal-like photonic structure will strongly interact with light and increase light harvesting.

The photoanode microstructure is characterized by scanning electron microscopy (SEM) and X-Ray diffraction (XRD). In parallel, light interaction is modeled in order to find the best compromise in terms of photonic architecture. Sunlight absorption by the solar cells is presented and discussed with dependency of pore sizes and number of opal-like layers.

 

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