Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.070
Publication date: 11th July 2022
With the increasing efficiency of organic solar cells, it is now imperative to focus investigation on the improvement of device stability and the understanding of the degradation mechanisms. It is known that the interface between the active layer and the charge transport materials, such as metal-oxides, can strongly influence the device stability, and many passivation strategies have been reported recently [1]. Herein, we have identified a major source of instability when using nanoparticles of SnO2, which is determined by the presence of ionic species at the nanoparticle’s surface. The induced degradation mechanism is unveiled by means of photophysical and electrical measurements. Furthermore, we discover that with a very simple washing of the metal oxide nanoparticle layer we are able to reduce the device degradation. After the washing procedure, several non-fullerene acceptor based solar cells show a boost of the T80 device lifetime under illumination up to hundreds of hours.
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