Electron deficient molecules and their use in organic electronic applications

摘要

Improved electron acceptor materials for organic photovoltaic (OPV) cells are provided. More specifically, electron acceptor materials for OPVs can include vinylimide, vinylthioimide, alkynylimide and/or alkynylthioimide moieties. Experimental work with members of this class of material has demonstrated record solar cell power conversion efficiency (3.36%) for non-fullerene acceptors.

主权项

1. An organic photovoltaic cell including an electron acceptor material, wherein the electron acceptor material comprises molecules including one or more moieties selected from the group consisting of: vinylimide, vinylthioimide, alkynylimide and/or alkynylthioimide moieties;
wherein the molecules have an electron acceptor group B and one to six electron acceptor A groups covalently bound to a B group, wherein each of the A groups individually consists of:
a single XYZ structure, wherein X and Y are connected by two single covalent bonds, wherein Y and Z are connected by a single covalent bond, and wherein Y has no bonds other than the two single covalent bonds to X and the single covalent bond to Z; a) wherein X consists of a  fragment,wherein W are each independently O or S, and wherein R is a C1-C20 branched, unbranched or cyclic alkyl or heteroalkyl group having none, some or all hydrogen atoms substituted with fluorine atoms;
b) wherein Y consists of one or more aromatic rings; and c) wherein Z is a doubly bonded hydrocarbon having a —C═C— structure or a triply bonded —C≡C— structure.