Spin density encodes intramolecular singlet exciton fission in pentacene dimers View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

K. C. Krishnapriya, Palas Roy, Boregowda Puttaraju, Ulrike Salzner, Andrew J. Musser, Manish Jain, Jyotishman Dasgupta, Satish Patil

ABSTRACT

The formation of two triplet excitons at the cost of one photon via singlet exciton fission in organic semiconductors can potentially enhance the photocurrent in photovoltaic devices. However, the role of spin density distribution in driving this photophysical process has been unclear until now. Here we present the significance of electronic spin density distribution in facilitating efficient intramolecular singlet exciton fission (iSEF) in π-bridged pentacene dimers. We synthetically modulate the spin density distribution in a series of pentacene dimers using phenyl-, thienyl- and selenyl- flanked diketopyrrolopyrrole (DPP) derivatives as π-bridges. Using femtosecond transient absorption spectroscopy, we find that efficient iSEF is only observed for the phenyl-derivative in ~2.4 ps while absent in the other two dimers. Electronic structure calculations reveal that phenyl-DPP bridge localizes α- and β-spin densities on distinct terminal pentacenes. Upon photoexcitation, a spin exchange mechanism enables iSEF from a singlet state which has an innate triplet pair character. More... »

PAGES

33

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41467-018-07736-3

DOI

http://dx.doi.org/10.1038/s41467-018-07736-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1110955602

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30604740


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RDF/XML is a standard XML format for linked data.

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