Modeling the Free Carrier Recombination Kinetics in PTB7:PCBM Organic Photovoltaics
Abstract
Currently the exact recombination mechanism of free carriers in organic photovoltaic (OPV) devices is poorly understood. Often a reduced Langevin model is used to describe the decay behavior of electrons and holes. Here we propose a novel, simple kinetic model that accurately describes the decay behavior of free carriers in the PTB7:PCBM organic photovoltaic blend. In order to accurately describe the recombination behavior of free carriers as measured by time-resolved microwave conductivity (TRMC), this model needs to only take into account free and trapped holes in the polymer, and free electrons in the fullerene. The model is consistent for different PTB7:PCBM blend ratios and spans a light intensity range of over 3 orders of magnitude. Furthermore, the model demonstrates that dark carriers exist in the polymer and interact with photoinduced charge carriers, and that the trapping and detrapping rates of the holes are of high importance to the overall carrier lifetime.
- Authors:
-
- National Renewable Energy Lab. (NREL), Golden, CO (United States). Chemistry and Nanoscience Center
- Publication Date:
- Research Org.:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1331480
- Report Number(s):
- NREL/JA-5900-66893
Journal ID: ISSN 1932-7447
- Grant/Contract Number:
- AC36-08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 43; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 14 SOLAR ENERGY; 36 MATERIALS SCIENCE; organic photovoltaics; kinetic model; recombination; time-resolved microwave conductivity
Citation Formats
Oosterhout, Stefan D., Ferguson, Andrew J., Larson, Bryon W., Olson, Dana C., and Kopidakis, Nikos. Modeling the Free Carrier Recombination Kinetics in PTB7:PCBM Organic Photovoltaics. United States: N. p., 2016.
Web. doi:10.1021/acs.jpcc.6b07614.
Oosterhout, Stefan D., Ferguson, Andrew J., Larson, Bryon W., Olson, Dana C., & Kopidakis, Nikos. Modeling the Free Carrier Recombination Kinetics in PTB7:PCBM Organic Photovoltaics. United States. https://doi.org/10.1021/acs.jpcc.6b07614
Oosterhout, Stefan D., Ferguson, Andrew J., Larson, Bryon W., Olson, Dana C., and Kopidakis, Nikos. Mon .
"Modeling the Free Carrier Recombination Kinetics in PTB7:PCBM Organic Photovoltaics". United States. https://doi.org/10.1021/acs.jpcc.6b07614. https://www.osti.gov/servlets/purl/1331480.
@article{osti_1331480,
title = {Modeling the Free Carrier Recombination Kinetics in PTB7:PCBM Organic Photovoltaics},
author = {Oosterhout, Stefan D. and Ferguson, Andrew J. and Larson, Bryon W. and Olson, Dana C. and Kopidakis, Nikos},
abstractNote = {Currently the exact recombination mechanism of free carriers in organic photovoltaic (OPV) devices is poorly understood. Often a reduced Langevin model is used to describe the decay behavior of electrons and holes. Here we propose a novel, simple kinetic model that accurately describes the decay behavior of free carriers in the PTB7:PCBM organic photovoltaic blend. In order to accurately describe the recombination behavior of free carriers as measured by time-resolved microwave conductivity (TRMC), this model needs to only take into account free and trapped holes in the polymer, and free electrons in the fullerene. The model is consistent for different PTB7:PCBM blend ratios and spans a light intensity range of over 3 orders of magnitude. Furthermore, the model demonstrates that dark carriers exist in the polymer and interact with photoinduced charge carriers, and that the trapping and detrapping rates of the holes are of high importance to the overall carrier lifetime.},
doi = {10.1021/acs.jpcc.6b07614},
journal = {Journal of Physical Chemistry. C},
number = 43,
volume = 120,
place = {United States},
year = {Mon Oct 03 00:00:00 EDT 2016},
month = {Mon Oct 03 00:00:00 EDT 2016}
}
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