title: Fully solution-processing route toward highly transparent polymer solar cells.
abstract: We report highly transparent polymer solar cells using metallic silver nanowires (AgNWs) as both the electron- and hole-collecting electrodes. The entire stack of the devices is processed from solution using a doctor blading technique. A thin layer of zinc oxide nanoparticles is introduced between photoactive layer and top AgNW electrode which plays decisive roles in device functionality: it serves as a mechanical foundation which allows the solution-deposition of top AgNWs, and more importantly it facilitates charge carriers extraction due to the better energy level alignment and the formation of ohmic contacts between the active layer/ZnO and ZnO/AgNWs. The resulting semitransparent polymer:fullerene solar cells showed a power conversion efficiency of 2.9%, which is 72% of the efficiency of an opaque reference device. Moreover, an average transmittance of 41% in the wavelength range of 400-800 nm is achieved, which is of particular interest for applications in transparent architectures.
authors.affiliation: Institute of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-University Erlangen-Nuremberg , Martensstrasse 7, 91058 Erlangen, Germany.
authors.forename: Fei
authors.initials: F
authors.lastname: Guo
authors.forename: Peter
authors.initials: P
authors.lastname: Kubis
authors.forename: Tobias
authors.initials: T
authors.lastname: Stubhan
authors.forename: Ning
authors.initials: N
authors.lastname: Li
authors.forename: Derya
authors.initials: D
authors.lastname: Baran
authors.forename: Thomas
authors.initials: T
authors.lastname: Przybilla
authors.forename: Erdmann
authors.initials: E
authors.lastname: Spiecker
authors.forename: Karen
authors.initials: K
authors.lastname: Forberich
authors.forename: Christoph J
authors.initials: CJ
authors.lastname: Brabec
keywords: ITO-free; OPV; fully solution-processing; semitransparent polymer solar cells