Enhanced Structural and Chemical Stability of New Inorganic Halide Perovskite Solar Cell Structures via Nickel Doping and Silicon Dioxide Encapsulation

Conventional perovskite solar cells (PSCs) have adapted the organic–inorganic hybrid perovskites as the absorption layer due to low processing temperature, superior optoelectronic properties, and simple solution processing. However, hybrid perovskites are more vulnerable to heat compared to inorganic perovskites. For long‐term operation, heat stability is essential for the commercialization of PSCs based on hybrid perovskite. In this study, we synthesized inorganic halide perovskite CsPbBr 3 with SiO 2 shell to ensure stability against heat. However, due to the lattice mismatch between the SiO 2 shell and CsPbBr 3 , we introduced nickel doping using nickel acetate to reduce this mismatch. The nickel‐doped CsPbBr 3 –SiO 2 core–shell perovskite exhibited superior thermal stability, maintaining the 92% of its initial performance after 12 h at 353 K.