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Critical Size/Viscosity for Coffee-Ring-Free Printing of Perovskite Micro/Nanopatterns
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-03-17 , DOI: 10.1021/acsami.1c23630 Guannan Zhang 1 , Hanyuan Zhang 1 , Rui Yu 1 , Yongqing Duan 1 , YongAn Huang 1 , Zhouping Yin 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-03-17 , DOI: 10.1021/acsami.1c23630 Guannan Zhang 1 , Hanyuan Zhang 1 , Rui Yu 1 , Yongqing Duan 1 , YongAn Huang 1 , Zhouping Yin 1
Affiliation
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Inkjet printing is the most encouraging method for patterning and integrating perovskite materials into microminiature application scenarios. However, it is still challenging to achieve high-resolution, coffee-ring-free, and perfect crystallized patterns. Here, a strategy based on powerful electrohydrodynamic printing and droplet viscosity–size coordinate regulation is developed to solve the above problems. By adding a long-chain polymer poly(vinylpyrrolidone) (PVP) into perovskite precursor to tune ink viscosity and introducing electrohydrodynamic printing to print the high-viscosity ink into droplets of different sizes, we can manipulate the inside flowing resistance and outside evaporation rate of a droplet, thus revealing a critical size/viscosity under which the coffee ring effect is inhibited, showing immense potential and significance for high-quality patterning. In addition, the long-chain polymer benefits droplet spatial limitation and uniform crystallization. The as-printed luminous patterns demonstrate high resolution (structure size ∼1 μm), excellent brightness, pleasant uniformity, and fascinating compatibility with flexible substrates, which is promising for future perovskite optoelectronic device applications.
中文翻译：
钙钛矿微/纳米图案无咖啡环印刷的临界尺寸/粘度
喷墨打印是将钙钛矿材料图案化和集成到微型应用场景中的最令人鼓舞的方法。然而，实现高分辨率、无咖啡环和完美的结晶图案仍然具有挑战性。在这里，开发了一种基于强大的电流体动力打印和液滴粘度-尺寸坐标调节的策略来解决上述问题。通过在钙钛矿前驱体中添加长链聚合物聚（乙烯基吡咯烷酮）（PVP）来调节油墨粘度，并引入电流体动力打印将高粘度油墨打印成不同尺寸的液滴，我们可以控制内部流动阻力和外部蒸发速率。一个液滴，从而显示出抑制咖啡环效应的临界尺寸/粘度，显示出高质量图案化的巨大潜力和意义。此外，长链聚合物有利于液滴空间限制和均匀结晶。所印刷的发光图案具有高分辨率（结构尺寸~1 μm）、出色的亮度、良好的均匀性以及与柔性基板的迷人兼容性，这对于未来的钙钛矿光电器件应用很有前景。
更新日期：2022-03-17
中文翻译：
钙钛矿微/纳米图案无咖啡环印刷的临界尺寸/粘度
喷墨打印是将钙钛矿材料图案化和集成到微型应用场景中的最令人鼓舞的方法。然而，实现高分辨率、无咖啡环和完美的结晶图案仍然具有挑战性。在这里，开发了一种基于强大的电流体动力打印和液滴粘度-尺寸坐标调节的策略来解决上述问题。通过在钙钛矿前驱体中添加长链聚合物聚（乙烯基吡咯烷酮）（PVP）来调节油墨粘度，并引入电流体动力打印将高粘度油墨打印成不同尺寸的液滴，我们可以控制内部流动阻力和外部蒸发速率。一个液滴，从而显示出抑制咖啡环效应的临界尺寸/粘度，显示出高质量图案化的巨大潜力和意义。此外，长链聚合物有利于液滴空间限制和均匀结晶。所印刷的发光图案具有高分辨率（结构尺寸~1 μm）、出色的亮度、良好的均匀性以及与柔性基板的迷人兼容性，这对于未来的钙钛矿光电器件应用很有前景。
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