Lead (Pb) perovskites can be synthetically modified to form colloidal nanocrystals which exhibit remarkable optoelectronic properties in the various fields such as light-emitting devices, flexible electronics, and photodetectors. However, because of the toxicity issue of Pb, nanocrystals of Pb free such as tin (Sn)-based perovskites have got attention. In the present work, we have selected the Sn-based perovskite, Cs₂SnI₆, owing to the high air and thermal stability. Quantum dots of Cs₂SnI₆ were prepared by using two methods, namely the hot-injection method and the ultrasonic irradiation method. The difference between Cs₂SnI₆ particles generated by these two methods was discussed. The particles synthesized by using the hot-injection method were less than 10 nm in size and were aggregated structure due to particle tight-binding energy. On the other hand, the particles by using the ultrasonic irradiation method gave a mono-dispersed solution. The particle size was from several ten nanometers to several hundred nanometers.

可以对铅（Pb）钙钛矿进行合成修饰，以形成胶体纳米晶体，该胶体纳米晶体在诸如发光器件，柔性电子器件和光电探测器等各个领域中表现出显着的光电性能。然而，由于铅的毒性问题，无铅的纳米晶体如锡（Sn）基钙钛矿受到关注。在当前的工作中，由于高的空气和热稳定性，我们选择了Sn基钙钛矿Cs ₂ SnI ₆。Cs ₂ SnI _6的量子点是通过热注入法和超声波照射法两种方法制备的。Cs ₂ SnI ₆之间的区别讨论了通过这两种方法生成的粒子。通过热注射法合成的颗粒尺寸小于10nm，并且由于颗粒紧密结合能而成为聚集结构。另一方面，通过使用超声波照射法的颗粒得到单分散溶液。粒度为几十纳米至几百纳米。