Spin-dependent charge transfer state design rules in organic photovoltaics View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2015-12

AUTHORS

Wendi Chang, Daniel N. Congreve, Eric Hontz, Matthias E. Bahlke, David P. McMahon, Sebastian Reineke, Tony C. Wu, Vladimir Bulović, Troy Van Voorhis, Marc A. Baldo

ABSTRACT

Charge transfer states play a crucial role in organic photovoltaics, mediating both photocurrent generation and recombination losses. In this work, we examine recombination losses as a function of the electron-hole spacing in fluorescent charge transfer states, including direct monitoring of both singlet and triplet charge transfer state dynamics. Here we demonstrate that large donor-acceptor separations minimize back transfer from the charge transfer state to a low-lying triplet exciton 'drain' or the ground state by utilizing external pressure to modulate molecular spacing. The triplet drain quenches triplet charge transfer states that would otherwise be spin protected against recombination, and switches the most efficient origin of the photocurrent from triplet to singlet charge transfer states. Future organic solar cell designs should focus on raising the energy of triplet excitons to better utilize triplet charge transfer mediated photocurrent generation or increasing the donor-acceptor spacing to minimize recombination losses. More... »

PAGES

6415

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/ncomms7415

DOI

http://dx.doi.org/10.1038/ncomms7415

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1037219555

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/25762410


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