Spin-dependent charge transfer state design rules in organic photovoltaics.

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Chang W,Congreve DN,Hontz E,Bahlke ME,McMahon DP,Reineke S,Wu TC,Bulović V,Van Voorhis T,Baldo MA

doi

10.1038/ncomms7415

subject

Has Abstract

pub_date

2015-03-12 00:00:00

pages

6415

issn

2041-1723

pii

ncomms7415

journal_volume

6

pub_type

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