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Title: Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy

Understanding charge separation and charge transport at a molecular level is crucial for improving the efficiency of organic photovoltaic (OPV) cells. Under illumination of Bulk Heterojunction (BHJ) blends of polymers and fullerenes, various paramagnetic species are formed including polymer and fullerene radicals, radical pairs, and photoexcited triplet states. Light-induced Electron Paramagnetic Resonance (EPR) spectroscopy is ideally suited to study these states in BHJ due to its selectivity in probing the paramagnetic intermediates. Some advanced EPR techniques like light-induced ENDOR spectroscopy and pulsed techniques allow the determination of hyperfine coupling tensors, while high-frequency EPR allows the EPR signals of the individual species to be resolved and their g-tensors to be determined. In these magnetic resonance parameters reveal details about the delocalization of the positive polaron on the various polymer donors which is important for the efficient charge separation in BHJ systems. Time-resolved EPR can contribute to the study of the dynamics of charge separation, charge transfer and recombination in BHJ by probing the unique spectral signatures of charge transfer and triplet states. Furthermore, the potential of the EPR also allows characterization of the intermediates and products of BHJ degradation.
Authors:
;
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: 7; Journal Issue: 10; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Bulk Heterojunction; Electron Paramagnetic Resonance; Fullerene; Organic Photovoltaic; Polymer
OSTI Identifier:
1372298
Alternate Identifier(s):
OSTI ID: 1400622

Niklas, Jens, and Poluektov, Oleg. Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy. United States: N. p., Web. doi:10.1002/aenm.201602226.
Niklas, Jens, & Poluektov, Oleg. Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy. United States. doi:10.1002/aenm.201602226.
Niklas, Jens, and Poluektov, Oleg. 2017. "Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy". United States. doi:10.1002/aenm.201602226. https://www.osti.gov/servlets/purl/1372298.
@article{osti_1372298,
title = {Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy},
author = {Niklas, Jens and Poluektov, Oleg},
abstractNote = {Understanding charge separation and charge transport at a molecular level is crucial for improving the efficiency of organic photovoltaic (OPV) cells. Under illumination of Bulk Heterojunction (BHJ) blends of polymers and fullerenes, various paramagnetic species are formed including polymer and fullerene radicals, radical pairs, and photoexcited triplet states. Light-induced Electron Paramagnetic Resonance (EPR) spectroscopy is ideally suited to study these states in BHJ due to its selectivity in probing the paramagnetic intermediates. Some advanced EPR techniques like light-induced ENDOR spectroscopy and pulsed techniques allow the determination of hyperfine coupling tensors, while high-frequency EPR allows the EPR signals of the individual species to be resolved and their g-tensors to be determined. In these magnetic resonance parameters reveal details about the delocalization of the positive polaron on the various polymer donors which is important for the efficient charge separation in BHJ systems. Time-resolved EPR can contribute to the study of the dynamics of charge separation, charge transfer and recombination in BHJ by probing the unique spectral signatures of charge transfer and triplet states. Furthermore, the potential of the EPR also allows characterization of the intermediates and products of BHJ degradation.},
doi = {10.1002/aenm.201602226},
journal = {Advanced Energy Materials},
number = 10,
volume = 7,
place = {United States},
year = {2017},
month = {3}
}

Works referenced in this record:

Photoinduced electron transfer in supramolecular systems for artificial photosynthesis
journal, May 1992
  • Wasielewski, Michael R.
  • Chemical Reviews, Vol. 92, Issue 3, p. 435-461
  • DOI: 10.1021/cr00011a005

Polymer Photovoltaic Cells: Enhanced Efficiencies via a Network of Internal Donor-Acceptor Heterojunctions
journal, December 1995

Powering the planet: Chemical challenges in solar energy utilization
journal, October 2006
  • Lewis, N. S.; Nocera, D. G.
  • Proceedings of the National Academy of Sciences, Vol. 103, Issue 43, p. 15729-15735
  • DOI: 10.1073/pnas.0603395103

The emergence of perovskite solar cells
journal, July 2014
  • Green, Martin A.; Ho-Baillie, Anita; Snaith, Henry J.
  • Nature Photonics, Vol. 8, Issue 7, p. 506-514
  • DOI: 10.1038/nphoton.2014.134

Opportunities and challenges for a sustainable energy future
journal, August 2012
  • Chu, Steven; Majumdar, Arun
  • Nature, Vol. 488, Issue 7411, p. 294-303
  • DOI: 10.1038/nature11475

Stability/degradation of polymer solar cells
journal, July 2008
  • Jørgensen, Mikkel; Norrman, Kion; Krebs, Frederik C.
  • Solar Energy Materials and Solar Cells, Vol. 92, Issue 7, p. 686-714
  • DOI: 10.1016/j.solmat.2008.01.005

Recent Advances in Sensitized Mesoscopic Solar Cells
journal, November 2009
  • Grätzel, Michael
  • Accounts of Chemical Research, Vol. 42, Issue 11, p. 1788-1798
  • DOI: 10.1021/ar900141y

Photoinduced Electron Transfer from a Conducting Polymer to Buckminsterfullerene
journal, November 1992

Charge Photogeneration in Organic Solar Cells
journal, November 2010
  • Clarke, Tracey M.; Durrant, James R.
  • Chemical Reviews, Vol. 110, Issue 11, p. 6736-6767
  • DOI: 10.1021/cr900271s