title: Nonfullerene Polymer Solar Cells with 8.5% Efficiency Enabled by a New Highly Twisted Electron Acceptor Dimer.
abstract: Fullerene-free and processing additive-free 8.5% efficient polymer solar cells are achieved by using a new 3,4-ethylenedioxythiophene-linked arylene diimide dimer with a 76° twist angle. The devices combine high (78-83%) external quantum efficiency with high (0.91-0.95 V) photovoltages and thus have relatively low optical bandgap energy loss.
authors.affiliation: Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA.
authors.forename: Ye-Jin
authors.initials: YJ
authors.lastname: Hwang
authors.affiliation: Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA.
authors.forename: Haiyan
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA.
authors.forename: Brett A E
authors.initials: BA
authors.lastname: Courtright
authors.affiliation: Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA.
authors.forename: Selvam
authors.initials: S
authors.lastname: Subramaniyan
authors.affiliation: Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA.
authors.forename: Samson A
authors.initials: SA
authors.lastname: Jenekhe
keywords: diimide dimers; nonfullerene acceptors; optical band gap; organic solar cells; polymer solar cells