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Understanding the Role of Order in Y‐Series Non‐Fullerene Solar Cells to Realize High Open‐Circuit Voltages

Lorena Perdigón‐Toro Orcid Logo, Le Quang Phuong, Fabian Eller, Guillaume Freychet, Elifnaz Saglamkaya, Jafar I. Khan, Qingya Wei, Stefan Zeiske, Daniel Kroh, Stefan Wedler, Anna Köhler, Ardalan Armin Orcid Logo, Frédéric Laquai, Eva M. Herzig, Yingping Zou, Safa Shoaee, Dieter Neher Orcid Logo

Advanced Energy Materials, Volume: 12, Issue: 12, Start page: 2103422

Swansea University Authors: Stefan Zeiske, Ardalan Armin Orcid Logo

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DOI (Published version): 10.1002/aenm.202103422

Abstract

Non-fullerene acceptors (NFAs) as used in state-of-the-art organic solar cells feature highly crystalline layers that go along with low energetic disorder. Here, the crucial role of energetic disorder in blends of the donor polymer PM6 with two Y-series NFAs, Y6, and N4 is studied. By performing tem...

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Published in: Advanced Energy Materials
ISSN: 1614-6832 1614-6840
Published: Wiley 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa59315
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Abstract: Non-fullerene acceptors (NFAs) as used in state-of-the-art organic solar cells feature highly crystalline layers that go along with low energetic disorder. Here, the crucial role of energetic disorder in blends of the donor polymer PM6 with two Y-series NFAs, Y6, and N4 is studied. By performing temperature-dependent charge transport and recombination studies, a consistent picture of the shape of the density of state distributions for free charges in the two blends is developed, allowing an analytical description of the dependence of the open-circuit voltage VOC on temperature and illumination intensity. Disorder is found to influence the value of the VOC at room temperature, but also its progression with temperature. Here, the PM6:Y6 blend benefits substantially from its narrower state distributions. The analysis also shows that the energy of the equilibrated free charge population is well below the energy of the NFA singlet excitons for both blends and possibly below the energy of the populated charge transfer manifold, indicating a down-hill driving force for free charge formation. It is concluded that energetic disorder of charge-separated states has to be considered in the analysis of the photovoltaic properties, even for the more ordered PM6:Y6 blend.
Keywords: energetic disorder; non-fullerene acceptors; open-circuit voltage; organic solar cells
College: College of Science
Funders: Deutsche Forschungsgemeinschaft; German Research Foundation. Grant Numbers: 450968074, 182087777 – SFB 951, 3923306670; SolarEraNet. Grant Number: NFA4R2ROPV; Elite Network of Bavaria; Soft Matter Interfaces Beamline; U.S. Department of Energy; Brookhaven National Laboratory. Grant Number: DE-SC0012704; King Abdullah University of Science and Technology; Office of Sponsored Research. Grant Number: OSR-CARF/CCF-3079; National Natural Science Foundation of China. Grant Number: 52125306; European Regional Development Fund; Welsh European Funding Office; Swansea University Strategic Initiative in Sustainable Advanced Materials; Office of Science. Grant Number: DE-SC0012704; Open access funding enabled and organized by Projekt DEAL.
Issue: 12
Start Page: 2103422