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

Uyen N.V. Huynh; Tek P. Basel; Eitan Ehrenfreund; Gang Li; Yang Yang; S. Mazumdar; Z. Valy Vardeny

doi:10.1103/PhysRevLett.119.017401

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

Uyen N.V. Huynh, Tek P. Basel, Eitan Ehrenfreund, Gang Li, Yang Yang, S. Mazumdar, Z. Valy Vardeny

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

29 Citations (Scopus)

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.

Original language	English
Article number	017401
Journal	Physical Review Letters
Volume	119
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.119.017401
Publication status	Published - 6 Jul 2017

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.119.017401

http://hdl.handle.net/10397/76182

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AU - Huynh, Uyen N.V.

AU - Basel, Tek P.

AU - Ehrenfreund, Eitan

AU - Li, Gang

AU - Yang, Yang

AU - Mazumdar, S.

AU - Vardeny, Z. Valy

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

Abstract

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