Ultrastable Lead-Free CsAgCl₂ Perovskite Microcrystals for Photocatalytic CO₂ Reduction

Nowadays, there is much attention focusing on lead halide perovskite because of its admirable performances in optoelectronic applications. However, the notorious toxicity and long-term instability are two main factors limiting its widespread applications. The findings of this work demonstrate a facile synthesis process for novel lead-free CsAgCl₂ perovskite microcrystals with no organic ligand involved. The fundamental properties of the CsAgCl₂ microcrystals are revealed by applying temperature-dependent X-ray diffraction and photoluminescence measurements from 77 to 300 K. Furthermore, the CsAgCl₂ microcrystals exhibit excellent air (60 days), thermal (100 °C), and light stability. Meanwhile, the CsAgCl₂ microcrystals have shown exciting potential applications in the fields of photocatalysis and photoelectrochemistry.