Gravure printing and rheological properties of perovskite inks with starch additive
Antti Nurmesjärvi a, Kaisa-Leena Väisänen a, Riikka Suhonen a
a VTT Technical Research Centre of Finland Ltd, Kaitoväylä 1, Oulu 90590, Finland
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
Poster, Antti Nurmesjärvi, 284
Publication date: 30th March 2023

Development of scalable and environmentally friendly manufacturing methods is a necessity to realize the large-scale production and commercialization of perovskite solar cells. Gravure printing is a method suitable for large-scale roll-to-roll manufacturing of patterned layers.

In this work we present gravure printing of FA0.83Cs0.17Pb(I0.9Br0.1)3 perovskite from dimethyl sulfoxide (DMSO) with starch as a rheological modifier. Starch increases perovskite ink viscosity and helps with perovskite film growth, enabling processing in one step without anti-solvent quenching. [1] We use DMSO as the only solvent, which was found to have the lowest impact for both human health and environment when compared to other common solvents for perovskite processing. [2]

We discovered that the viscosity of the perovskite ink can be tuned not only by the amount of starch but also by aging of the ink and modifying ink preparation conditions. This was found to have a strong impact on the homogeneity of the printed perovskite layer and thus also to the cell performance. The longer heating time during dissolution resulted to similar results with the aging of the ink.

Work received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement no.861985 (PeroCUBE)

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