Energy Transfer to a Stable Donor Suppresses Degradation in Organic Solar Cells. (20th November 2019)

• Record Type: Journal Article
• Authors: Weu, Andreas; Kumar, Rhea; Butscher, Julian F.; Lami, Vincent; Paulus, Fabian; Bakulin, Artem A.; Yaynzof, Yana
• Is Part Of: Advanced functional materials. Volume 30:Number 5(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-11-20
• Subjects: device stability -- energy transfer -- organic photovoltaics -- small molecule donor -- transient absorption spectroscopy; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201907432
• Languages: English
• ISSNs: 1616-301X

Abstract

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 PC70 BM 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 PC70 BM 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. Abstract : A novel, photoprotective effect based on an ultrafast, long‐range energy transfer from a fullerene acceptor to a stable small molecule donor significantly enhances the stability of organic photovoltaic devices. Transient absorption spectroscopy studies reveal that this occurs via an ultrafast quenching of the acceptor excited state, which would otherwise lead to rapid degradation of the material.