Spin-dependent charge transfer state design rules in organic photovoltaics

Wendi Chang, Daniel N. Congreve, Eric Hontz, Matthias E. Bahlke, David P. McMahon, Sebastian Reineke, Tony C. Wu, Vladimir Bulović (), Troy Van Voorhis () and Marc A. Baldo ()
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Wendi Chang: Massachusetts Institute of Technology
Daniel N. Congreve: Massachusetts Institute of Technology
Eric Hontz: Massachusetts Institute of Technology
Matthias E. Bahlke: Massachusetts Institute of Technology
David P. McMahon: Massachusetts Institute of Technology
Sebastian Reineke: Massachusetts Institute of Technology
Tony C. Wu: Massachusetts Institute of Technology
Vladimir Bulović: Massachusetts Institute of Technology
Troy Van Voorhis: Massachusetts Institute of Technology
Marc A. Baldo: Massachusetts Institute of Technology

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms7415

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