title: Efficient tandem and triple-junction polymer solar cells.
abstract: We demonstrate tandem and triple-junction polymer solar cells with power conversion efficiencies of 8.9% and 9.6% that use a newly designed, high molecular weight, small band gap semiconducting polymer and a matching wide band gap polymer.
authors.affiliation: Molecular Materials and Nanosystems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Li
authors.forename: Alice
authors.initials: A
authors.lastname: Furlan
authors.forename: Koen H
authors.initials: KH
authors.lastname: Hendriks
authors.forename: Martijn M
authors.initials: MM
authors.lastname: Wienk
authors.forename: René A J
authors.initials: RA
authors.lastname: Janssen