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Role of Exciton Diffusion and Lifetime in Organic Solar Cells with a Low Energy Offset
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Ardalan Armin ,
Oskar Sandberg
The Journal of Physical Chemistry Letters, Volume: 13, Issue: 20, Pages: 4402 - 4409
Swansea University Authors:
Drew Riley, Paul Meredith , Ardalan Armin , Oskar Sandberg
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DOI (Published version): 10.1021/acs.jpclett.2c00791
Abstract
Despite general agreement that the generation of free charges in organic solar cells is driven by an energetic offset, power conversion efficiencies have been improved using low-offset blends. In this work, we explore the interconnected roles that exciton diffusion and lifetime play in the charge ge...
| Published in: | The Journal of Physical Chemistry Letters |
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| ISSN: | 1948-7185 1948-7185 |
| Published: |
American Chemical Society (ACS)
2022
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa60050 |
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| Abstract: |
Despite general agreement that the generation of free charges in organic solar cells is driven by an energetic offset, power conversion efficiencies have been improved using low-offset blends. In this work, we explore the interconnected roles that exciton diffusion and lifetime play in the charge generation process under various energetic offsets. A detailed balance approach is used to develop an analytic framework for exciton dissociation and free-charge generation accounting for exciton diffusion to and dissociation at the donor–acceptor interface. For low-offset systems, we find the exciton lifetime to be a pivotal component in the charge generation process, as it influences both the exciton and CT state dissociation. These findings suggest that any novel low-offset material combination must have long diffusion lengths with long exciton lifetimes to achieve optimum charge generation yields. |
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| College: |
Faculty of Science and Engineering |
| Funders: |
This work was supported by the Welsh Government’s Ser̂ Cymru II Program through the European Regional Development Fund, Welsh European Funding Office, and the Swansea University strategic initiative in Sustainable Advanced Materials. A.A. is a Ser Cymru II Rising Star Fellow, and P.M. is a Se ̂ r̂
Cymru II National Research Chair. This work was also funded by UKRI through the EPSRC Program Grant EP/T028511/1 Application Targeted Integrated Photovoltaics. D.B.R. acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC), [PGSD3-545694-2020]. |
| Issue: |
20 |
| Start Page: |
4402 |
| End Page: |
4409 |