Influence of octanedithiol on the nanomorphology of PCPDTBT:PCBM blends studied by solid-state NMR

The influence of octanedithiol (ODT) on the film morphology of PCPDTBT:PCBM (1:2) blends processed from solutions in chlorobenzene was studied by chemical shift selective carbon-13 solid-state NMR relaxation experiments. A close contact between PCBM and PCPDTBT is demonstrated for PCPDTBT:PCBM films...

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Bibliographic Details
Published inSolar energy materials and solar cells Vol. 96; no. 1; pp. 210 - 217
Main Authors Chambon, Sylvain, Mens, Raoul, Vandewal, Koen, Clodic, Ewan, Markus, Scharber, Lutsen, Laurence, Gelan, Jan, Manca, Jean, Vanderzande, Dirk, Adriaensens, Peter
Format Journal Article
LanguageEnglish
Published Elsevier 19.10.2011
Subjects
Engineering Sciences
Materials
PCPDTBT
Film morphology
ODT thiols
Organic solar cells
NMR relaxation
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Summary:The influence of octanedithiol (ODT) on the film morphology of PCPDTBT:PCBM (1:2) blends processed from solutions in chlorobenzene was studied by chemical shift selective carbon-13 solid-state NMR relaxation experiments. A close contact between PCBM and PCPDTBT is demonstrated for PCPDTBT:PCBM films processed with as well as without ODT, i.e. the dimensions of the substructures in the PCBM rich and polymer rich domains are smaller than 10 nm. The PCBM organization is shown to be reduced towards very small and weakly organized clusters. The main difference of processing the active film in the presence of ODT can be found in the ability of the polymer to improve its chain packing towards a state that closely resembles this of pure PCPDTBT. This difference in physical interaction between the polymer chains can explain the improved power conversion efficiency and the EQE red-shift of solar cells processed with ODT.
ISSN:0927-0248
1879-3398