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Issue 4, 2016
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Locally resolved large scale phase separation in polymer:fullerene blends

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Abstract

We report a comprehensive study probing the influence of polymer blending on the large scale phase separation by the use of electroluminescence imaging (ELI) and light-beam induced current (LBIC) measurements. The study is based on a semi-crystalline and an amorphous analogue of anthracene-containing poly(p-phenylene-ethynylene)-alt-poly(p-phenylene-vinylene) (PPE–PPV) copolymer (AnE-PVs) blended with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Since the semi-crystalline polymer AnE-PVab strongly phase separates from PCBM, whereas the amorphous polymer AnE-PVba intimately mixes with PCBM, the phase separation is precisely controlled by blending both polymers in distinct ratios. The analysis of electroluminescence images and light-beam induced current scans allowed us to conclude about the domain size of the phase separated bulk material and intermixed regions, respectively, with the advantage of probing the whole active layer of the device at once.

Graphical abstract: Locally resolved large scale phase separation in polymer:fullerene blends

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Article information


Submitted
03 Sep 2015
Accepted
07 Nov 2015
First published
12 Jan 2016

J. Mater. Chem. A, 2016,4, 1244-1250
Article type
Paper
Author version available

Locally resolved large scale phase separation in polymer:fullerene blends

C. Kästner, M. Seeland, D. A. M. Egbe and H. Hoppe, J. Mater. Chem. A, 2016, 4, 1244
DOI: 10.1039/C5TA07004J

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