Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.214
Publication date: 18th December 2023
Abstract
Recently, non-fullerene acceptor based organic solar cells show a significant improvement in power conversion efficiency. However, rapid degradation occurs under illumination, particularly when photocatalytic metal oxide electron transport layers are used in these devices.[1,2] We introduced vitamin C (ascorbic acid) into the organic solar cells as a photostabilizer and systematically studied its photostabilizing effect on inverted PBDB-T:IT-4F devices. The presence of vitamin C as an antioxidant layer between the ZnO electron transport layer and the photoactive layer strongly suppressed the photocatalytic effect of ZnO that induces NFA photodegradation. Upon 96 h of exposure to AM 1.5G 1 Sun irradiation, the reference devices lost 64% of their initial efficiency, while those containing vitamin C lost only 38%. The UV–visible absorption, impedance spectroscopy, and light-dependent voltage and current measurements reveal that vitamin C reduces the photobleaching of NFA molecules and suppresses the charge recombination. This simple approach using a low-cost, naturally occurring antioxidant, provides an efficient strategy for improving photostability of organic semiconductor-based devices.
V.T. acknowledges support from L’Oréal-UNESCO for Women in Science. The authors acknowledge Carlsbergfondet for project Artplast (CF20-0531), and Independent Research Fund Denmark for projects Artplast (0217-00245B) and ReactPV (8022-00389B). This project has received funding from the European Union’s Horizon 2020 research and innovation program grant agreement no 101007084.
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