title: Highly crystalline films of PCPDTBT with branched side chains by solvent vapor crystallization: influence on opto-electronic properties.
abstract: PCPDTBT, a marginally crystallizable polymer, is crystallized into a new crystal structure using solvent-vapor annealing. Highly ordered areas with three different polymer-chain orientations are identified using TEM/ED, GIWAXS, and polarized Raman spectroscopy. The optical and structural properties differ significantly from films prepared by standard device preparation protocols. Bilayer solar cells, however, show similar performance.
authors.affiliation: IPOC-Functional Polymers, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany.
authors.forename: Florian S U
authors.initials: FS
authors.lastname: Fischer
authors.forename: Daniel
authors.initials: D
authors.lastname: Trefz
authors.forename: Justus
authors.initials: J
authors.lastname: Back
authors.forename: Navaphun
authors.initials: N
authors.lastname: Kayunkid
authors.forename: Benjamin
authors.initials: B
authors.lastname: Tornow
authors.forename: Steve
authors.initials: S
authors.lastname: Albrecht
authors.forename: Kevin G
authors.initials: KG
authors.lastname: Yager
authors.forename: Gurpreet
authors.initials: G
authors.lastname: Singh
authors.forename: Alamgir
authors.initials: A
authors.lastname: Karim
authors.forename: Dieter
authors.initials: D
authors.lastname: Neher
authors.forename: Martin
authors.initials: M
authors.lastname: Brinkmann
authors.forename: Sabine
authors.initials: S
authors.lastname: Ludwigs
keywords: PCPDTBT (poly{[4,4-bis(2-ethylhexyl)-cyclopenta-(2,1-b;3,4-b')dithiophen]-2,6-diyl-alt-(2,1,3-benzo-thiadiazole)-4,7-diyl}); crystallization; low bandgap polymers; morphology; solvent vapor annealing