Highly Crystalline Films of PCPDTBT with Branched Side Chains by Solvent Vapor Crystallization: Influence on Opto‐Electronic Properties
Florian S. U. Fischer(University of Stuttgart), Daniel Trefz(University of Stuttgart), Justus Back(University of Stuttgart), Navaphun Kayunkid(King Mongkut's Institute of Technology Ladkrabang), Benjamin Tornow(University of Potsdam), Steve Albrecht(University of Potsdam), Kevin G. Yager(Brookhaven National Laboratory), Gurpreet Singh(IBM Research - Almaden), Alamgir Karim(University of Akron), Dieter Neher(University of Potsdam), Martin Brinkmann(Institut Charles Sadron), Sabine Ludwigs(University of Stuttgart)
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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.
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