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Enhancing uniformity in large-area slot die coating of low-viscosity perovskite ink

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Abstract

Large-scale slot die coating technology is crucial for producing perovskite films in perovskite solar cells. Producing high-quality perovskite films requires a stable coating window to ensure that the thickness of the films is uniform and free of defects. This research delves into the production of high-quality perovskite films via slot die coating. It employs a combined approach of theoretical analysis and numerical simulation to define coating limits. Furthermore, it examines the influence of the geometric structure within the internal flow field and the transformation of fluid flow patterns in the external flow field on the overall film quality. We demonstrate that the removal of the edge geometry to the transverse fluid channel in the coating head significantly improves the stability of the internal flow field and enhances the consistency of fluid discharge. Additionally, uniform and stable coating of a perovskite solution can be achieved when the speed of the coating substrate in the downstream coating gap exceeds 0.7 times the maximum velocity of the Poiseuille component of the flow, and the coating flow pattern in the downstream coating gap remains consistent with Couette flow.

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Acknowledgments

This work has been partially supported by Industry Outlook and Key Core Technology Projects of Jiangsu Province (BE2022022-4, BE2022022-2, BE2021022-1), Industry Outlook and Key Core Technology Projects of Zhenjiang (GY2022025), Qinlan and 333 Project of Jiangsu Province.

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Authors and Affiliations

  1. Institute of Intelligent Flexible Mechatronics, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    Haiwen Peng, Hongwei Hu, Jiali Ding, Guanggui Cheng & Jianning Ding

  2. Institute of Technology for Carbon Neutralization, Yangzhou University, Yangzhou, 225009, People’s Republic of China

    Jianning Ding

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  1. Haiwen Peng
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  2. Hongwei Hu
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  3. Jiali Ding
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  4. Guanggui Cheng
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Contributions

HP: Investigation/Methodology/Writing—original draft/Writing—review and editing. HH: Writing—review and editing/Project Administration. JD: Investigation/Supervision/Validation. GC: Funding Acquisition/Writing—review and  editing/Supervision/Conceptualization. JD: Funding Acquisition/Writing—review and editing/Supervision/Conceptualization.

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Correspondence to Guanggui Cheng.

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Peng, H., Hu, H., Ding, J. et al. Enhancing uniformity in large-area slot die coating of low-viscosity perovskite ink. J Coat Technol Res (2024). https://doi.org/10.1007/s11998-024-00922-7

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  • DOI: https://doi.org/10.1007/s11998-024-00922-7

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