Improving the reproducibility of hybrid perovskite film deposition by Slot-Die Coating
Alejandra Florez Velasquez a, Daniel Ramirez Zora a, Franklin Jaramillo Isaza a
a Centro de Investigación y Desarrollo de Materiales (CIDEMAT), Universidad de Antioquia
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Contributed talk, Alejandra Florez Velasquez, presentation 068
Publication date: 20th April 2022

Maintaining high-quality perovskite films in large-area and flexible devices represents the main difficulty in the scaling of photovoltaic devices because it needs both to ensure high throughput and understanding the perovskite thin-film formation. It demands scalable deposition techniques, available to guarantee these conditions and to reduce the manufacturing costs.

Slot-Die Coating (SDC) is one of the best options to reach large-area devices since it allows the processing of several layers and enables the manufacture of flexible devices. This technique demands to achieve a uniform volume distribution in the manifold and a stable meniscus to establish bidimensional and steady-stable flow along the substrate length. Also, the relationship between the gap and the film thickness is determinant to obtaining homogeneously and defect-free films.

SDC has been applied in solar photovoltaic scaling, focused on the crystallization process for uniform film formation and setting aside the analysis of the variables involved in the equipment, which to the best of our knowledge, requires a deeper understanding of the low viscosity perovskite ink, like what has been studied for viscous fluids. This work explores the nature of the flow patterns inside the slot-die head including an analysis of the volume uniformity in the manifold and identifying the best lab processing conditions to guarantee uniform, bidimensional and stable flow. This promotes the formation of homogeneous films and non-defects crystallization of the perovskite and paves the way towards highly reproducible and scalable perovskite solar devices by slot-die coating.

We gratefully acknowledge the financial support provided by the Colombia Scientific Program within the framework of the call Ecosistema Científico (contract no. FP44842—218-2018).

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