title: Acceptor-donor-acceptor oligomers containing dithieno[3,2-b:2',3'-d]pyrrole and thieno[2,3-c]pyrrole-4,6-dione units for solution-processed organic solar cells.
abstract: New acceptor-donor-acceptor (A-D-A) oligomers (1 and 2) containing a central dithieno[3,2-b:2',3'-d]pyrrole unit and end-capping thieno[2,3-c]pyrrole-4,6-dione groups have been synthesized and characterized. Bulk heterojunction solar cells were prepared together with PC61BM and PC71BM, and the best results were obtained for the latter acceptor using 1,8-diiodooctane as an additive. Photovoltaic devices containing these oligomers achieved high external quantum efficiencies up to 50%.
authors.affiliation: Institut für Organische Chemie II und Neue Materialien, Universität Ulm , Albert-Einstein-Allee 11 89081 Ulm, Germany.
authors.forename: Lauren G
authors.initials: LG
authors.lastname: Mercier
authors.forename: Amaresh
authors.initials: A
authors.lastname: Mishra
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Ishigaki
authors.forename: Florian
authors.initials: F
authors.lastname: Henne
authors.forename: Gisela
authors.initials: G
authors.lastname: Schulz
authors.forename: Peter
authors.initials: P
authors.lastname: Bäuerle