Conjugated Block Copolymers as Model Systems to Examine Mechanisms of Charge Generation in Donor–Acceptor Materials

Melissa P. Aplan, Christopher Grieco, Youngmin Lee, Jason M. Munro, Wonho Lee, Jennifer Lynn Gray, Zach D. Seibers, Brooke Kuei, Joshua H. Litofsky, S. Michael Kilbey, Qing Wang, Ismaila Dabo, John B. Asbury, Enrique Daniel Gomez

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Fully conjugated donor–acceptor block copolymers are established as model systems to elucidate fundamental mechanisms of photocurrent generation in organic photovoltaics. Using analysis of steady-state photoluminescence quenching, exciton dissociation to a charge transfer state within individual block copolymer chains is quantified. By making a small adjustment to the conjugated backbone, the electronic properties are altered enough to disrupt charge transfer almost entirely. Strong intermolecular coupling of the electron donor is introduced by synthesizing block copolymer nanoparticles. Transient absorption spectroscopy is used to monitor charge generation in block copolymer isolated chains and nanoparticles. While efficient charge transfer is observed in isolated chains, there is no indication of complete charge separation. In the nanoparticles, long-lived polarons are observed as early as ≈15 ns. Thus, aggregation of electron donors can facilitate efficient charge generation.

Original languageEnglish (US)
Article number1804858
JournalAdvanced Functional Materials
Volume29
Issue number1
DOIs
StatePublished - Jan 4 2019

Fingerprint

block copolymers
Block copolymers
Charge transfer
charge transfer
Nanoparticles
nanoparticles
Polarons
Electrons
polarons
polarization (charge separation)
Photocurrents
Absorption spectroscopy
Excitons
Electronic properties
photocurrents
Quenching
Photoluminescence
absorption spectroscopy
indication
electrons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry

Cite this

Aplan, Melissa P. ; Grieco, Christopher ; Lee, Youngmin ; Munro, Jason M. ; Lee, Wonho ; Gray, Jennifer Lynn ; Seibers, Zach D. ; Kuei, Brooke ; Litofsky, Joshua H. ; Kilbey, S. Michael ; Wang, Qing ; Dabo, Ismaila ; Asbury, John B. ; Gomez, Enrique Daniel. / Conjugated Block Copolymers as Model Systems to Examine Mechanisms of Charge Generation in Donor–Acceptor Materials. In: Advanced Functional Materials. 2019 ; Vol. 29, No. 1.
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Conjugated Block Copolymers as Model Systems to Examine Mechanisms of Charge Generation in Donor–Acceptor Materials. / Aplan, Melissa P.; Grieco, Christopher; Lee, Youngmin; Munro, Jason M.; Lee, Wonho; Gray, Jennifer Lynn; Seibers, Zach D.; Kuei, Brooke; Litofsky, Joshua H.; Kilbey, S. Michael; Wang, Qing; Dabo, Ismaila; Asbury, John B.; Gomez, Enrique Daniel.

In: Advanced Functional Materials, Vol. 29, No. 1, 1804858, 04.01.2019.

Research output: Contribution to journalArticle

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AU - Aplan, Melissa P.

AU - Grieco, Christopher

AU - Lee, Youngmin

AU - Munro, Jason M.

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AU - Gray, Jennifer Lynn

AU - Seibers, Zach D.

AU - Kuei, Brooke

AU - Litofsky, Joshua H.

AU - Kilbey, S. Michael

AU - Wang, Qing

AU - Dabo, Ismaila

AU - Asbury, John B.

AU - Gomez, Enrique Daniel

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