Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/76182
Title: Transient magnetophotoinduced absorption studies of photoexcitations in pi-conjugated donor-acceptor copolymers
Authors: Huynh, UNV
Basel, TP
Ehrenfreund, E
Li, G 
Yang, Y
Mazumdar, S
Vardeny, ZV
Issue Date: 2017
Publisher: American Physical Society
Source: Physical review letters, 2017, v. 119, no. 1, 17401 How to cite?
Journal: Physical review letters 
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 pi-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.
URI: http://hdl.handle.net/10397/76182
ISSN: 0031-9007
EISSN: 1079-7114
DOI: 10.1103/PhysRevLett.119.017401
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