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Role of Exciton Diffusion and Lifetime in Organic Solar Cells with a Low Energy Offset

Drew Riley, Paul Meredith Orcid Logo, Ardalan Armin Orcid Logo, Oskar Sandberg Orcid Logo

The Journal of Physical Chemistry Letters, Volume: 13, Issue: 20, Pages: 4402 - 4409

Swansea University Authors: Drew Riley, Paul Meredith Orcid Logo, Ardalan Armin Orcid Logo, Oskar Sandberg Orcid Logo

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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 ge...

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Published in: The Journal of Physical Chemistry Letters
ISSN: 1948-7185 1948-7185
Published: American Chemical Society (ACS) 2022
Online Access: Check full text

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.
College: College of Science
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