Abstract：
The non-uniform distribution of colloidal particles in perovskite precursor results in an imbalanced response to the shear force during flexible printing process. Herein, it is observed that the continuous disordered migration occurring in perovskite inks significantly contributes to the enlargement of colloidal particles size and diminishes the crystallization activity of the inks. Therefore, a molecular encapsulation architecture by glycerol monostearate to mitigate colloidal particles collisions in the precursor ink, while simultaneously homogenizing the size distribution of perovskite colloids to minimize their diffusion disparities, is devised. The utilization of colloidal particles with a molecular encapsulation structure enables the achievement of uniform deposition during the printing process, thereby effectively balancing the crystallization rate and phase transition in the film and facilitating homogeneous crystallization of perovskite films. The large-area flexible perovskite device (1.01 cm2 and 100 cm2) fabricated through printing processes, achieves an efficiency of 24.45% and 15.87%, respectively, and manifests superior environmental stability, maintaining an initial efficiency of 91% after being stored in atmospheric ambiences for 150 days (unencapsulated). This work demonstrates that the dynamic evolution process of colloidal particles in both the precursor ink and printing process represents a crucial stride toward achieving uniform crystallization of perovskite films.
摘要：
胶体颗粒在钙钛矿前体中的不均匀分布导致在柔性印刷过程中对剪切力的不平衡响应。在这里，我们观察到，钙钛矿油墨中发生的连续无序迁移显着促进了胶体颗粒尺寸的增大，并降低了油墨的结晶活性。因此,我们设计了一种通过单硬脂酸甘油酯（GMS）的分子封装结构，以减轻前体墨水中的胶体颗粒碰撞，同时使钙钛矿胶体的尺寸分布均匀化，以最大程度地减少其扩散差异。利用具有分子封装结构的胶体颗粒，可以在印刷过程中实现均匀沉积，从而有效地平衡膜中的结晶速率和相变并促进钙钛矿膜的均匀结晶。通过印刷工艺制造的大面积柔性钙钛矿器件（1.01cm2和100cm2），实现了24.45%和15.87%的效率，分别,并表现出优越的环境稳定性，在大气环境中储存150天后(未封装)保持91%的初始效率。这项工作表明，前体油墨和印刷过程中胶体颗粒的动力学演化过程代表了实现钙钛矿膜均匀结晶的关键一步。本文受版权保护。保留所有权利。
