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. 2015 Feb 18;27(7):1223-8.
doi: 10.1002/adma.201403475. Epub 2014 Dec 6.

Highly crystalline films of PCPDTBT with branched side chains by solvent vapor crystallization: influence on opto-electronic properties

Florian S U Fischer  1 , Daniel Trefz, Justus Back, Navaphun Kayunkid, Benjamin Tornow, Steve Albrecht, Kevin G Yager, Gurpreet Singh, Alamgir Karim, Dieter Neher, Martin Brinkmann, Sabine Ludwigs
Affiliations

Highly crystalline films of PCPDTBT with branched side chains by solvent vapor crystallization: influence on opto-electronic properties

Florian S U Fischer et al. Adv Mater. .

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.

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.

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