Strong Intermolecular Interactions Induced by High Quadrupole Moments Enable Excellent Photostability of Non‐Fullerene Acceptors for Organic Photovoltaics
Abstract: Understanding degradation mechanisms of organic photovoltaics (OPVs) is a critical prerequisite for improving device stability. Herein, the effect of molecular structure on the photostability of non‐fullerene acceptors (NFAs) is studied by changing end‐group substitution of ITIC derivatives: ITIC, ITIC‐2F, and ITIC‐DM. Using an assay of in situ spectroscopy techniques and molecular simulations, the photodegradation product of ITIC and the rate of product formation are identified, which correlates excellently to reported device stability, with ITIC‐2F being the most stable and ITIC‐DM the least. The choice of acceptor is found to affect both the donor polymer (PBDB‐T) photostability and the morphological stability of the bulk heterojunction blend. Molecular simulations reveal that NFA end‐group substitution strongly modulates the electron distribution within the molecule and thus its quadrupole moment. Compared to unsubstituted‐ITIC, end‐group fluorination results in a stronger, and demethylation a weaker, molecular quadrupole moment. This influences the intermolecular interactions between NFAs and between the NFA and the polymer, which in turn affects the photostability and morphological stability. This hypothesis is further tested on two other high quadrupole acceptors, Y6 and IEICO‐4F, which both show impressive photostability. The strong correlation observed between NFA quadrupole moment and photostability opens a new synthetic direction for photostable organic photovoltaic materials.
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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Strong Intermolecular Interactions Induced by High Quadrupole Moments Enable Excellent Photostability of Non‐Fullerene Acceptors for Organic Photovoltaics ; day:25 ; month:06 ; year:2022 ; extent:11
Advanced energy materials ; (25.06.2022) (gesamt 11)
- Creator
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Luke, Joel
Yang, Emily J.
Chin, Yi‐Chun
Che, Yuxuan
Winkler, Lisa
Whatling, Darius
Labanti, Chiara
Park, Song Yi
Kim, Ji‐Seon
- DOI
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10.1002/aenm.202201267
- URN
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urn:nbn:de:101:1-2022062515141746196010
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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15.08.2025, 7:29 AM CEST
Data provider
Deutsche Nationalbibliothek. If you have any questions about the object, please contact the data provider.
Associated
- Luke, Joel
- Yang, Emily J.
- Chin, Yi‐Chun
- Che, Yuxuan
- Winkler, Lisa
- Whatling, Darius
- Labanti, Chiara
- Park, Song Yi
- Kim, Ji‐Seon
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Semitransparent Organic Photovoltaics Utilizing Intrinsic Charge Generation in Non‐Fullerene Acceptors
Assessing intra- and inter-molecular charge transfer excitations in non-fullerene acceptors using electroabsorption spectroscopy
Noncovalent Conformational Locks Enabling Efficient Nonfullerene Acceptors
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Fabrication of Organic Solar Cells, Screening of Non-Fullerene Acceptors and the Investigation of their Intermolecular Interactions
Exciton Binding Energy of Non‐Fullerene Electron Acceptors
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Development of non-fullerene electron acceptors for efficient organic photovoltaics
Semitransparent Organic Photovoltaics Utilizing Intrinsic Charge Generation in Non‐Fullerene Acceptors
Assessing intra- and inter-molecular charge transfer excitations in non-fullerene acceptors using electroabsorption spectroscopy
Noncovalent Conformational Locks Enabling Efficient Nonfullerene Acceptors
Flexible Organic Photovoltaics with Star‐Shaped Nonfullerene Acceptors End Capped with Indene Malononitrile and Barbiturate Derivatives
The State‐of‐the‐Art Solution‐Processed Single Component Organic Photodetectors Achieved by Strong Quenching of Intermolecular Emissive State and High Quadrupole Moment in Non‐Fullerene Acceptors
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Exciton Binding Energy of Non‐Fullerene Electron Acceptors
Bromination: An Alternative Strategy for Non‐Fullerene Small Molecule Acceptors
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