@article{a79b05f84ca845c7b1ab098ac813cf58,
title = "Transient Magnetophotoinduced Absorption Studies of Photoexcitations in π -Conjugated Donor-Acceptor Copolymers",
abstract = "We have utilized a plethora of transient and steady state optical and magneto-optical spectroscopies in a broad spectral range (0.25-2.5 eV) for elucidating the primary and long-lived photoexcitations in a low band-gap π-conjugated donor-acceptor (DA) copolymer used for efficient photovoltaic solar cells. We show that both singlet excitons (SE) and intrachain triplet-triplet (TT) pairs are photogenerated in the DA-copolymer chains. From the picosecond transient magnetic field response of these species we conclude that the SE and TT spin states are coupled. The TT decomposition into two intrachain geminate triplet excitons maintains spin coherence and thus their spin entanglement lasts into the microsecond time domain.",
author = "Huynh, {Uyen N.V.} and Basel, {Tek P.} and Eitan Ehrenfreund and Gang Li and Yang Yang and S. Mazumdar and Vardeny, {Z. Valy}",
note = "Funding Information: The work at the University of Utah was supported by the AFOSR under Grant No.FA9550-16-1-0207 (ps transient spectroscopy); and NSF-MRSEC Program No.DMR 1121252 (cw spectroscopy and the acquisition of the experimental facilities for thesubmicrosecond transient spectroscopy). The work at Technion was supported by the Israel Science Foundation (ISF 598/14). The work at UCLA was supported by ONR (N00014-14-1-0648), AFOSR (FA2386-15-1-4108), and National Science Foundation (DMR-1335645). The work at Arizona was supported by NSF-CHE-1151475. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",
year = "2017",
month = jul,
day = "6",
doi = "10.1103/PhysRevLett.119.017401",
language = "English (US)",
volume = "119",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "1",
}