Journal
CHEMISTRY OF MATERIALS
Volume 22, Issue 11, Pages 3543-3548Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm1008619
Keywords
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Funding
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- Center for Advanced Molecular Photovoltaics [KUS-C1-015-21]
- National Science Foundation
- Swiss National Science Foundation
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Fullerenes have been shown to intercalate between the side chains of many crystalline and semi-crystalline polymers and to affect the properties of polymer:fullerene bulk heterojunction solar cells. Here we present the first in-depth study of intercalation in an amorphous polymer. We study blends of the widely studied amorphous polymer poly(2-methoxy-5-(3',7'-dimethyloctyloxy)-p-phenylene vinylene) (MDMO-PPV) with a variety of molecules using photoluminescence measurements, scanning electron microscopy, and space-charge limited current mobility measurements. The blends with elevated hole mobilities exhibit complete photoluminescence quenching and show no phase separation in a scanning electron microscope. We conclude that intercalation occurs in MDMO-PPV:fullerene blends and is responsible for the increase in the MDMO-PPV hole mobility by several orders of magnitude when it is blended with fullerenes, despite the dilution of the hole-conducting polymer with an electron acceptor.
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