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Theory of primary photoexcitations in donor-acceptor copolymers | | Karan Aryanpour
; Tirthankar Dutta
; Uyen Huynh
; Zeev Valy Vardeny
; Sumit Mazumdar
; | | Date: |
1 Aug 2015 | | Abstract: | We present a generic theory of primary photoexcitations in low bandgap
donor-acceptor conjugated copolymers. Due to the combined effects of strong
electron correlations and broken symmetry, there is considerable mixing between
a charge-transfer exciton and an energetically proximate triplet-triplet state
with overall spin singlet. The triplet-triplet state, optically forbidden in
homopolymers, is allowed in donor-acceptor copolymers. For intermediate
difference in electron affinities of the donor and the acceptor, the
triplet-triplet state can have stronger oscillator strength than the
charge-transfer exciton. We discuss the possibility of intramolecular singlet
fission from the triplet-triplet state, and how such fission can be detected
experimentally. | | Source: | arXiv, 1508.0071 | | Services: | Forum | Review | PDF | Favorites | |
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