Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 3, Issue 21, Pages 5541-5548Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tc00781j
Keywords
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Funding
- National Science Foundation (CBET Energy for Sustainability) [CBET-1436875]
- Danish National Research Foundation [DNRF 0059]
- Danish Ministry of Science, Innovation and Higher Education under a Sapere Aude Top Scientist grant [DFF - 1335-00037A]
- Elite Scientist grant [11-116028]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1436875] Funding Source: National Science Foundation
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Composition average dependent properties for blends of the conjugated polymer P3HT and the fullerenes [60]PCBM, [60]ICBA and their mixtures were studied using cross-polarization magic-angle-spinning solid-state NMR techniques. We found that the blended fullerenes form an alloy and that when mixed with a third polymer component, the system exhibits pseudo-binary phase behaviour instead of the expected ternary phase behaviour. Our results experimentally confirm the earlier hypothesis that the unexpected composition average dependent IV-behaviour for these supposed ternary mixtures are indeed due to them behaving as pseudo-binary mixtures due to alloying of the fullerene components. This finding has vast implications for the understanding of polymer-fullerene mixtures and quite certainly also their application in organic solar cells where performance hinges critically on the blend behaviour which is also investigated in this study.
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