Journal article 535 views 349 downloads
Theoretical Perspective on Transient Photovoltage and Charge Extraction Techniques
Oskar J. Sandberg,
Kristofer Tvingstedt,
Paul Meredith,
Ardalan Armin 
The Journal of Physical Chemistry C, Volume: 123, Issue: 23, Pages: 14261 - 14271
Swansea University Author:
Ardalan Armin
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DOI (Published version): 10.1021/acs.jpcc.9b03133
Abstract
Transient photovoltage (TPV) is a technique frequently used to determine charge carrier lifetimes in thin-film solar cells such as organic, dye sensitized and perovskite solar cells. As this lifetime is often incident light intensity dependent, its relevance to understanding the intrinsic properties...
| Published in: | The Journal of Physical Chemistry C |
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| ISSN: | 1932-7447 1932-7455 |
| Published: |
2019
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa50534 |
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| Abstract: |
Transient photovoltage (TPV) is a technique frequently used to determine charge carrier lifetimes in thin-film solar cells such as organic, dye sensitized and perovskite solar cells. As this lifetime is often incident light intensity dependent, its relevance to understanding the intrinsic properties of a photoactive material system as a material or device figure of merit has been questioned. To extract complete information on recombination dynamics, the TPV measurements are often performed in conjunction with charge extraction (CE) measurements, employed to determine the photo-generated charge carrier density and thereby the recombination rate constant and its order. In this communication, the underlying theory of TPV and CE is reviewed and expanded. Our theoretical findings are further solidified by numerical simulations and experiments on organic solar cells. We identify regimes of the open-circuit voltage within which accurate lifetimes and carrier densities can be determined with TPV and CE experiments. A wide range of steady-state light intensities is required in performing these experiments in order to identify their “working dynamic range” from which the recombination kinetics in thin-film solar cells can be determined. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
23 |
| Start Page: |
14261 |
| End Page: |
14271 |