Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy
Abstract
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:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1372298
- Alternate Identifier(s):
- OSTI ID: 1400622
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Energy Materials
- Additional Journal Information:
- Journal Volume: 7; Journal Issue: 10; Journal ID: ISSN 1614-6832
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Bulk Heterojunction; Electron Paramagnetic Resonance; Fullerene; Organic Photovoltaic; Polymer
Citation Formats
Niklas, Jens, and Poluektov, Oleg. Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy. United States: N. p., 2017.
Web. doi:10.1002/aenm.201602226.
Niklas, Jens, & Poluektov, Oleg. Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy. United States. https://doi.org/10.1002/aenm.201602226
Niklas, Jens, and Poluektov, Oleg. Fri .
"Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy". United States. https://doi.org/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 = {Fri Mar 03 00:00:00 EST 2017},
month = {Fri Mar 03 00:00:00 EST 2017}
}
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