An enhanced couette flow printing strategy to recover efficiency losses by area and substrate differences in perovskite solar cells,Energy & Environmental Science

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An enhanced couette flow printing strategy to recover efficiency losses by area and substrate differences in perovskite solar cells
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2022-08-29 , DOI: 10.1039/d2ee00966h
Chenxiang Gong ₁ , Baojin Fan ₁ , Feng Li ₁ , Zhi Xing ₁ , Xiangchuan Meng ₁ , Ting Hu ₁ , Xiaotian Hu _{1,

2} , Yiwang Chen _{1,

2,

3}

Affiliation

The uneven crystallization rate of perovskite films causes the inevitable efficiency losses, due to the intrinsic agglomeration of colloidal particles and substrate differences. Herein, a patterned-meniscus coating strategy is introduced to enhance the Couette flow during the printing of perovskite solar cells (PSCs), which avoids the agglomeration in the film entirety. Owing to the introduction of shear strain and extensional flow by the patterned-meniscus coating, generation of the colloidal particle fluxion in the perovskite wet-film state can be greatly decreased, which further inhibits the influence of secondary agglomeration on perovskite films. In addition, patterned-meniscus coating can enhance the printing window tolerance of perovskite films. Consequently, the corresponding inverted PSCs achieve a PCE of 20.08% based on a flexible substrate. More importantly, the sensitivity of colloidal particles to scale and substrate discrepancies can be well reduced. The efficiency loss caused by different areas and substrate conversion decreases from 34.7% to 12.6% (enlarging the scale from 0.04 cm² to 1.01 cm²), and from 48.2% to 29.3% with the substrate transition (rigid to flexible), respectively. This handleability strategy provides a reference for fabricating high-quality perovskite films and outstanding-performance PSCs.

中文翻译：

一种增强的 couette 流式印刷策略，可通过钙钛矿太阳能电池的面积和基板差异来恢复效率损失

由于胶体颗粒的内在聚集和基板差异，钙钛矿薄膜的不均匀结晶速率导致不可避免的效率损失。在此，引入了一种图案化的弯月面涂层策略来增强钙钛矿太阳能电池（PSC）印刷过程中的库埃特流动，从而避免了整个薄膜的团聚。由于图案化弯月面涂层引入剪切应变和拉伸流动，可以大大减少钙钛矿湿膜状态下胶体颗粒流动的产生，进一步抑制了二次团聚对钙钛矿薄膜的影响。此外，图案化弯月面涂层可以提高钙钛矿薄膜的印刷窗口耐受性。因此，相应的倒置 PSC 的 PCE 为 20。08% 基于柔性基板。更重要的是，胶体颗粒对水垢和基材差异的敏感性可以很好地降低。不同面积和基板转化造成的效率损失从34.7%降低到12.6%（尺度从0.04 cm放大）²到 1.01 cm²），以及从 48.2% 到 29.3% 的基板过渡（刚性到柔性），分别。这种可操作性策略为制造高质量的钙钛矿薄膜和性能优异的 PSC 提供了参考。

更新日期：2022-08-29

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