title: Enantiopure versus Racemic Naphthalimide End-Capped Helicenic Non-fullerene Electron Acceptors: Impact on Organic Photovoltaics Performance.
abstract: Impact of the enantiopurity on organic photovoltaics (OPV) performance was investigated through the synthesis of racemic and enantiomerically pure naphthalimide end-capped helicenes and their application as non-fullerene molecular electron acceptors in OPV devices. A very strong increase of the device performance was observed by simply switching from the racemic to the enantiopure forms of these π-helical non-fullerene acceptors with power conversion efficiencies jumping from 0.4 to about 2.0 % in air-processed poly(3-hexylthiophene)-based devices, thus highlighting the key role of enantiopurity in the photovoltaic properties.
authors.affiliation: CNRS UMR 6200, MOLTECH-Anjou, University of Angers, 2 Bd. Lavoisier, 49045, Angers, France.
authors.forename: Pierre
authors.initials: P
authors.lastname: Josse
authors.affiliation: Institut des Sciences Chimiques de Rennes UMR 6226, Institut de Physique de Rennes, UMR 6251, CNRS Université de Rennes 1, Campus de Beaulieu, 35042, Rennes Cedex, France.
authors.forename: Ludovic
authors.initials: L
authors.lastname: Favereau
authors.affiliation: Institut des Sciences Chimiques de Rennes UMR 6226, Institut de Physique de Rennes, UMR 6251, CNRS Université de Rennes 1, Campus de Beaulieu, 35042, Rennes Cedex, France.
authors.forename: Chengshuo
authors.initials: C
authors.lastname: Shen
authors.affiliation: CNRS UMR 6200, MOLTECH-Anjou, University of Angers, 2 Bd. Lavoisier, 49045, Angers, France.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Dabos-Seignon
authors.affiliation: CNRS UMR 6200, MOLTECH-Anjou, University of Angers, 2 Bd. Lavoisier, 49045, Angers, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Blanchard
authors.affiliation: CNRS UMR 6200, MOLTECH-Anjou, University of Angers, 2 Bd. Lavoisier, 49045, Angers, France.
authors.forename: Clément
authors.initials: C
authors.lastname: Cabanetos
authors.affiliation: Institut des Sciences Chimiques de Rennes UMR 6226, Institut de Physique de Rennes, UMR 6251, CNRS Université de Rennes 1, Campus de Beaulieu, 35042, Rennes Cedex, France.
authors.forename: Jeanne
authors.identifier: http://orcid.org/0000-0002-4037-6067
authors.initials: J
authors.lastname: Crassous
keywords: chirality; enantiopurity; helicene; non-fullerene; organic photovoltaics