title: Amplification of light collection in solid-state dye-sensitized solar cells via the antenna effect through supramolecular assembly.
abstract: This study demonstrates that the concept of molecular antenna is a relevant strategy to improve the power conversion efficiency of solid-state dye-sensitized solar cells by extending their spectral sensitivity over a broad region of the solar spectrum. In this work, we have associated a BODIPY antenna to a bi-chromophoric sensitizer made of a squaraine unit linked to a zinc porphyrin by axial ligation onto the zinc. Using steady-state and transient photoluminescence spectroscopy, we demonstrate that efficient energy transfers occur from the antenna to the dyad, extending its visible photosensitivity. We also show that direct electron injection from the antenna to TiO2 is possible. A drastic improvement in the device performance by a factor of three is observed under illumination using the spiro-OMeTAD molecular glass as the solid-state electrolyte, leading to a panchromatic response of the device. The influence of the solid-state hole transporter on the supramolecular assembly is also discussed.
authors.affiliation: XLIM UMR 7252, Université de Limoges/CNRS, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France. johann.boucle@unilim.fr.
authors.forename: Bilel
authors.initials: B
authors.lastname: Louahem M'Sabah
authors.forename: Mourad
authors.initials: M
authors.lastname: Boucharef
authors.forename: Julien
authors.initials: J
authors.lastname: Warnan
authors.forename: Yann
authors.initials: Y
authors.lastname: Pellegrin
authors.forename: Errol
authors.initials: E
authors.lastname: Blart
authors.forename: Bruno
authors.initials: B
authors.lastname: Lucas
authors.forename: Fabrice
authors.initials: F
authors.lastname: Odobel
authors.forename: Johann
authors.initials: J
authors.lastname: Bouclé