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

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

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

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 tempera-ture-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 sub-stantially 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.
Original languageEnglish (US)
Pages (from-to)2103422
JournalAdvanced Energy Materials
DOIs
StatePublished - Feb 3 2022

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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