Insights on component optimization to reach color neutral and highly transparent near-infrared dye sensitized solar cells
Fionnuala Grifoni a, Waad Naim a, Thomas Alnasser a, Nadia Barbero b, Claudia Barolo b, Frédéric Sauvage a
a Laboratoire de Réactivité et Chimie des Solides (LRCS) UMR CNRS 7314 - Institut de Chimie de Picardie FR 3085 Université de Picardie Jules Verne 33 rue Saint Leu, FR-80039 Amiens Cedex, France
b Dipartimento di Chimica, NIS Interdepartmental and INSTM Reference Centre, Università degli Studi di Torino, Via Pietro Giuria 7, 10125 Torino, Italy
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Fionnuala Grifoni, presentation 017
Publication date: 20th April 2022

In the research for innovative glazing, Dye Sensitized Solar Cells (DSSC) represent an interesting and effective way to achieve energy conversion and visual comfort. In this context, our work aims to pave the way to selective NIR-sensitizers integrated into a new type of DSSCs being completely transparent and colorless in the whole visible region. Taking into account that the calculated wavelength cut-off to reach color neutrality corresponds to absorbance under 435nm and over 670nm, cyanine dyes represent the best candidates due to their capability to have a sharp and strong absorption in the NIR region without any significant residual in the visible.[1] This was demonstrated in our work on VG20 series dyes, where we reached a NIR-DSSC attaining up to 3.1% efficiency and an average visible transmittance (AVT) greater than 75%. [2] However, we further improve our system by careful optimization on sensitization conditions, photo-anode transparency, and electrolyte development, obtaining a neutral-color and highly transparent DSSC exhibiting an AVT greater than 80% and a high color rendering index (CRI) of 96 and attaining 2.5% efficiency. In this communication, we will discuss the strategies we implemented to reach these results by combining a colorless and transparent sulfur/iodide-based electrolyte [3] with VG20-C16 dye and studying the effect of the photoanode thickness on this system in terms of aesthetics and performance.



F.G., T.A., N.B., C.B., and F.S. acknowledge the “IMPRESSIVE” project, which received funding from the European Union’s Horizon2020. W.N. and F.S. acknowledge the Agence National de la Recherche (ANR) “VISION-NIR” program under grant agreement number ANR-17-CE05-0037.

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