SnO2 for High-Performance and Stable Organic Solar Cells
Maria Antonietta Loi a
a Photophysics and OptoElectronics Group, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, Groningen, Netherlands
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
London, United Kingdom, 2023 June 12th - 14th
Organizers: Tracey Clarke, James Durrant and Trystan Watson
Invited Speaker, Maria Antonietta Loi, presentation 227
DOI: https://doi.org/10.29363/nanoge.hopv.2023.227
Publication date: 30th March 2023

Electron and hole transport layers are of outmost importance for thin film solar cells, determining not only their efficiency but also their stability. When considering the necessary steps to bring one of these thin film technologies towards commercialization, more factors besides efficiency and stability become important, for example the ease of deposition in a scalable manner and the cost of the different material’s layers. Herein, highly efficient organic solar cells (OSCs), in the so-called inverted structure (n-i-p), are demonstrated by using as electron transport layer (ETL) tin oxide (SnO2) deposited by atomic layer deposition (ALD) but also by nanocrystals. ALD is an industrial grade technique which can be applied both at the wafer level but also in a roll-to-roll configuration. A champion efficiency of 17.26% and a record FF of 79% is shown by PM6:L8-BO OSCs when using ALD-SnO2 as ETL. These devices outperform not only solar cells with SnO2 nanoparticles casted from solution (PCE 16.03%, FF 74%) but also those utilizing the more common sol-gel ZnO (PCE 16.84%, FF 77%). The outstanding results are attributed to a reduced charge carrier recombination at the interface between the ALD SnO2 and the active layer.

While SnO2 nanocrystals seems to have large problems of light soaking and stability, I will report a very simple method to increase performances of this solution processable ETL making devices become more stable and reaching efficiencies up to 16.26 for PM6:L8-BO OSCs.

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