Researchers from Kyungpook National University in Daegu, Republic of Korea, published a study in TIB Open Publishing titled "Efficiency optimization of All-Inorganic perovskite solar cell device using NiOx and ZnO as charge transport layers." The research focused on developing an all-inorganic perovskite solar cell with the structure FTO/ZnO/CsPbBr3/NiOx/Au, using CsPbBr3 as the absorption layer and ZnO and NiOx as charge transport layers. Solvent engineering techniques, such as applying isopropyl alcohol and ethyl acetate during spin-coating, alongside absorber layer thickness and annealing condition optimization, were employed to enhance power conversion efficiency (PCE). Efficiency increased with layer thickness up to 280 nm, and post-deposition annealing at 225 °C for 2 hours yielded the highest PCE of 0.91%. These findings demonstrated the potential for optimizing all-inorganic perovskite solar cells through structural and processing refinements.