Variable-Temperature X-Ray Scattering Unveils the Solution Aggregation Structures and Processing Resiliency of High-Efficiency Organic Photovoltaics with Iodinated Electron Acceptors
© 2025 Wiley‐VCH GmbH.
| Veröffentlicht in: | Advanced materials (Deerfield Beach, Fla.). - 1998. - (2025) vom: 08. Aug., Seite e02275 |
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| Weitere Verfasser: | , , , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2025
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| Zugriff auf das übergeordnete Werk: | Advanced materials (Deerfield Beach, Fla.) |
| Schlagworte: | Journal Article conjugated polymers nonfullerene acceptors organic photovoltaics power conversion efficiency solution aggregation |
| Zusammenfassung: | © 2025 Wiley‐VCH GmbH. Polymer photovoltaics are promising for low-cost, flexible, and lightweight power supplies. Their performance is heavily influenced by the morphology of the polymer: acceptor blend, where the aggregation structures of both components play a crucial role in charge generation, transport, and overall device performance. This study probes and resolves the solution aggregation behavior and processing resilience of high-efficiency polymer photovoltaics incorporating an iodinated electron acceptor, BO-4I, using variable-temperature small-angle X-ray scattering and neutron scattering. By comparing BO-4I with its fluorinated counterpart, it is found that BO-4I exhibits excellent solution processing stability, whether in chlorobenzene or toluene. In addition, temperature-induced change in the donor:acceptor blend aggregation structure leads to significant alterations in film morphology, ultimately affecting device performance. Particularly, the stable solution aggregation structure of the BO-4I system confers processing resilience to device performance and achieves higher long-term device stability. Combining film structural analysis and device performance characterization, a structural inheritance is identified from solution to film, and determined that a organic photovoltaics polymer aggregate length of 27 ± 3 nm in solution is a key feature for achieving optimal efficiency in polymer photovoltaics. These findings provide valuable insights and guidance for designing future polymer photovoltaic systems |
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| Beschreibung: | Date Revised 08.08.2025 published: Print-Electronic Citation Status Publisher |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202502275 |