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Charge Transfer Excitons in Polymer/Fullerene Blends: The Role of Morphology and Polymer Chain Conformation

✍ Scribed by Markus Hallermann; Ilka Kriegel; Enrico Da Como; Josef M. Berger; Elizabeth von Hauff; Jochen Feldmann

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
542 KB
Volume
19
Category
Article
ISSN
1616-301X

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✦ Synopsis

Abstract

Here, it is shown how carrier recombination through charge transfer excitons between conjugated polymers and fullerene molecules is mainly controlled by the intrachain conformation of the polymer, and to a limited extent by the mesoscopic morphology of the blend. This experimental result is obtained by combining near‐infrared photoluminescence spectroscopy and transmission electron microscopy, which are sensitive to charge transfer exciton emission and morphology, respectively. The photoluminescence intensity of the charge transfer exciton is correlated to the degree of intrachain order of the polymer, highlighting an important aspect for understanding and limiting carrier recombination in organic photovoltaics.

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## Abstract **Summary:** The effect of chain architecture of in situ formed copolymers on the interfacial morphology of reactive polymer blends was investigated. We found that the chain architectures of copolymers at the interface significantly affected the reaction and interface roughness. Althoug