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

IF 2.3 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Coatings Technology and Research Pub Date : 2024-04-16 DOI:10.1007/s11998-024-00922-7

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

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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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提高低粘度包晶油墨大面积槽模涂层的均匀性

大规模槽模镀膜技术对于生产包晶体太阳能电池中的包晶体薄膜至关重要。生产高质量的磷灰石薄膜需要一个稳定的镀膜窗口，以确保薄膜厚度均匀且无缺陷。本研究深入探讨了如何通过槽模镀膜生产高质量的包晶体薄膜。它采用理论分析和数值模拟相结合的方法来确定镀膜极限。此外，研究还探讨了内部流场中几何结构和外部流场中流体流动模式的变化对整个薄膜质量的影响。我们证明，去除镀膜头横向流体通道的边缘几何结构可显著提高内部流场的稳定性，并增强流体排放的一致性。此外，当下游镀膜间隙中镀膜基底的速度超过流体中波伊赛尔分量最大速度的 0.7 倍，并且下游镀膜间隙中的镀膜流型与库尔特流保持一致时，就能实现均匀稳定的包晶溶液镀膜。

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来源期刊

Journal of Coatings Technology and Research 工程技术-材料科学：膜

CiteScore

4.30

自引率

8.70%

发文量

130

审稿时长

2.5 months

期刊介绍： Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.