Transient Magnetophotoinduced Absorption Studies of Photoexcitations in π -Conjugated Donor-Acceptor Copolymers | Zendy

Uyen Huynh | Zendy; Tek Basel | Zendy; E. Ehrenfreund | Zendy; Gang Li | Zendy; Yang Yang | Zendy; S. Mazumdar | Zendy; Z. Valy Vardeny | Zendy

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Transient Magnetophotoinduced Absorption Studies of Photoexcitations in π -Conjugated Donor-Acceptor Copolymers

Author(s) -

Uyen Huynh,

Tek Basel,

E. Ehrenfreund,

Gang Li,

Yang Yang,

S. Mazumdar,

Z. Valy Vardeny

Publication year - 2017

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.119.017401

Subject(s) - microsecond , materials science , singlet state , exciton , picosecond , ultrafast laser spectroscopy , molecular physics , physics , photochemistry , atomic physics , chemistry , spectroscopy , condensed matter physics , optics , excited state , quantum mechanics , laser

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

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