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, Sumitendra Mazumdar, Z. Valy Vardeny

Research output: Contribution to journalArticle

17 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 languageEnglish (US)
Article number017401
JournalPhysical Review Letters
Volume119
Issue number1
DOIs
StatePublished - Jul 6 2017

Fingerprint

photoexcitation
copolymers
excitons
solar cells
decomposition
magnetic fields
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Transient Magnetophotoinduced Absorption Studies of Photoexcitations in π -Conjugated Donor-Acceptor Copolymers. / Huynh, Uyen N.V.; Basel, Tek P.; Ehrenfreund, Eitan; Li, Gang; Yang, Yang; Mazumdar, Sumitendra; Vardeny, Z. Valy.

In: Physical Review Letters, Vol. 119, No. 1, 017401, 06.07.2017.

Research output: Contribution to journalArticle

Huynh, Uyen N.V. ; Basel, Tek P. ; Ehrenfreund, Eitan ; Li, Gang ; Yang, Yang ; Mazumdar, Sumitendra ; Vardeny, Z. Valy. / Transient Magnetophotoinduced Absorption Studies of Photoexcitations in π -Conjugated Donor-Acceptor Copolymers. In: Physical Review Letters. 2017 ; Vol. 119, No. 1.
@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 Sumitendra Mazumdar and Vardeny, {Z. Valy}",
year = "2017",
month = "7",
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",

}

TY - JOUR

T1 - Transient Magnetophotoinduced Absorption Studies of Photoexcitations in π -Conjugated Donor-Acceptor Copolymers

AU - Huynh, Uyen N.V.

AU - Basel, Tek P.

AU - Ehrenfreund, Eitan

AU - Li, Gang

AU - Yang, Yang

AU - Mazumdar, Sumitendra

AU - Vardeny, Z. Valy

PY - 2017/7/6

Y1 - 2017/7/6

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85022184392&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85022184392&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.119.017401

DO - 10.1103/PhysRevLett.119.017401

M3 - Article

VL - 119

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 1

M1 - 017401

ER -