Abstract：
Tin halide perovskites (THPs) have demonstrated exceptional potential for various applications owing to their low toxicity and excellent optoelectronic properties. However, the crystallization kinetics of THPs are less controllable than its lead counterpart because of the higher Lewis acidity of Sn2+, leading to THP films with poor morphology and rampant defects. Here, a colloidal zeta potential modulation approach is developed to improve the crystallization kinetics of THP films inspired by the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. After adding 3-aminopyrrolidine dihydro iodate (APDI2) in the precursor solution to change the zeta potential of the pristine colloids, the total interaction potential energy between colloidal particles with APDI2 could be controllably reduced, resulting in a higher coagulation probability and a lower critical nuclei concentration. In situ laser light scattering measurements confirmed the increased nucleation rate of the THP colloids with APDI2. The resulting film with APDI2 shows a pinhole-free morphology with fewer defects, achieving an impressive efficiency of 15.13 %.
摘要：
卤化锡钙钛矿（THP）由于其低毒性和出色的光电性能，已显示出在各种应用中的特殊潜力。然而,由于Sn2+的路易斯酸度较高，THP的结晶动力学比铅对应物更不可控，导致THP薄膜形态差，缺陷猖獗。这里,受经典Derjaguin-Landau-Verwey-Overbeek（DLVO）理论的启发，开发了一种胶体zeta电位调制方法来改善THP薄膜的结晶动力学。在前体溶液中加入3-氨基吡咯烷二氢碘酸盐（APDI2）以改变原始胶体的ζ电位后，胶体颗粒与APDI2之间的总相互作用势能可以可控地降低，导致更高的凝血概率和更低的临界核浓度。原位激光散射测量证实了具有APDI2的THP胶体的成核速率增加。具有APDI2的所得薄膜显示出无针孔的形态，缺陷较少，实现了15.13%的惊人效率。
