Energy transfer to a stable donor suppresses degradation in organic solar cells

• Verfasst von: Weu, Andreas [VerfasserIn]
• Verfasst von: Lami, Vincent [VerfasserIn]
• Verfasst von: Paulus, Fabian [VerfasserIn]
• Verfasst von: Vaynzof, Yana [VerfasserIn]
• Titel: Energy transfer to a stable donor suppresses degradation in organic solar cells
• Verf.angabe: Andreas Weu, Rhea Kumar, Julian F. Butscher, Vincent Lami, Fabian Paulus, Artem A. Bakulin, and Yana Yaynzof
• Jahr: 2020
• Jahr des Originals: 2019
• Umfang: 9 S.
• Fussnoten: First published: 20 November 2019 ; Falsche Schreibweise bei der Autorin Yana Vaynzof ; Gesehen am 18.01.2021
• Titel Quelle: Enthalten in: Advanced functional materials
• Ort Quelle: Weinheim : Wiley-VCH, 2001
• Jahr Quelle: 2020
• Band/Heft Quelle: 30(2020,5) Artikel-Nummer 1907432, 9 Seiten
• ISSN Quelle: 1616-3028
• DOI: doi:10.1002/adfm.201907432
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: device stability
• Sach-SW: energy transfer
• Sach-SW: organic photovoltaics
• Sach-SW: small molecule donor
• Sach-SW: transient absorption spectroscopy
• K10plus-PPN: 1744862931
• K10plus-PPN:
  Universitätsbibliothek
• Lokale URL UB: Zum Volltext

Abstract

Despite many advances toward improving the stability of organic photovoltaic devices, environmental degradation under ambient conditions remains a challenging obstacle for future application. Particularly conventional systems employing fullerene derivatives are prone to oxidize under illumination, limiting their applicability. Here, the environmental stability of the small molecule donor DRCN5T together with the fullerene acceptor PC70BM is reported. It is found that this system exhibits exceptional device stability, mainly due to almost constant short-circuit current. By employing ultrafast femtosecond transient absorption spectroscopy, this remarkable stability is attributed to two separate mechanisms: 1) DRCN5T exhibits high intrinsic resistance toward external factors, showing no signs of deterioration. 2) The highly sensitive PC70BM is stabilized against degradation by the presence of DRCN5T through ultrafast, long-range energy transfer to the donor, rapidly quenching the fullerene excited states which are otherwise precursors for chemical oxidation. It is proposed that this photoprotective mechanism be utilized to improve the device stability of other systems, including nonfullerene acceptors and ternary blends.