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 Communjournal_title
Nature communicationsauthors
Chang W,Congreve DN,Hontz E,Bahlke ME,McMahon DP,Reineke S,Wu TC,Bulović V,Van Voorhis T,Baldo MAdoi
10.1038/ncomms7415subject
Has Abstractpub_date
2015-03-12 00:00:00pages
6415issn
2041-1723pii
ncomms7415journal_volume
6pub_type
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