Advancements and Prospects in Perovskite Solar Cells: From Hybrid to All-Inorganic Materials Hybrid perovskites, composed of metals and organic substances, have emerged as promising materials for next-generation photovoltaic cells due to their unique optical, excitonic, and electrical properties. Inspired by sensitization techniques on TiO₂ substrates, hybrid perovskites such as CH₃NH₃PbBr₃ and CH₃NH₃PbI₃ were studied as light-absorbing layers and electron-hole pair generators. Photovoltaic cells based on perovskites have electron and hole transport layers (ETL and HTL, respectively), separated by an active layer composed of perovskite itself. Major advances have been made in the preparation methods of these devices and the development of different architectures, resulting in an efficiency exceeding 23% in less than 10 years. However, stability remains a major barrier to large-scale production of hybrid perovskites. Partially or fully inorganic perovskites, such as black perovskite phase CsPbI₃ (α-CsPbI₃), appear promising to circumvent the instability problem. In more advanced studies, partial or total substitution of Pb by Ge, Sn, Sb, Bi, Cu, or Ti is proposed to mitigate potential toxicity problems and maintain device efficiency. The review discusses the structure and components of hybrid perovskites, their advantages in optoelectronic applications, and the development of fully inorganic perovskites. Hybrid perovskites composed of lead halide and methylammonium have shown promise due to their high absorption coefficient in the visible region, direct and tunable band gap, ambipolar transport of charges, high exciton mobility, and long diffusion lengths. In a typical PSC, the photoabsorber layer is composed of perovskite sandwiched between an electron transport layer (ETL) and a hole transport layer (HTL). The operation principle starts with light absorption by perovskite to generate the electron-hole pair, followed by charge separation and the flow of electrons through the external circuit to produce an electric current. Perovskite solar cells can be arranged in regular or inverted configurations. The regular configuration is originated from solid-state DSSCs and is characterized by layers in the order of FTO/ETL/perovskite/HTL/metal. The inverted configuration originates from regular organic solar cells with the ETL and HTL layers in inverted positions. The structural organization of the perovskite layer also imparts different optoelectronic properties to the device, potentially leading to improvements in stability, conversion efficiency, and charge transport. Fully inorganic perovskites such as SrTiO₃, BaTiO₃, and Pb(Zr, Ti)O₃ have been extensively exploredAdvancements and Prospects in Perovskite Solar Cells: From Hybrid to All-Inorganic Materials Hybrid perovskites, composed of metals and organic substances, have emerged as promising materials for next-generation photovoltaic cells due to their unique optical, excitonic, and electrical properties. Inspired by sensitization techniques on TiO₂ substrates, hybrid perovskites such as CH₃NH₃PbBr₃ and CH₃NH₃PbI₃ were studied as light-absorbing layers and electron-hole pair generators. Photovoltaic cells based on perovskites have electron and hole transport layers (ETL and HTL, respectively), separated by an active layer composed of perovskite itself. Major advances have been made in the preparation methods of these devices and the development of different architectures, resulting in an efficiency exceeding 23% in less than 10 years. However, stability remains a major barrier to large-scale production of hybrid perovskites. Partially or fully inorganic perovskites, such as black perovskite phase CsPbI₃ (α-CsPbI₃), appear promising to circumvent the instability problem. In more advanced studies, partial or total substitution of Pb by Ge, Sn, Sb, Bi, Cu, or Ti is proposed to mitigate potential toxicity problems and maintain device efficiency. The review discusses the structure and components of hybrid perovskites, their advantages in optoelectronic applications, and the development of fully inorganic perovskites. Hybrid perovskites composed of lead halide and methylammonium have shown promise due to their high absorption coefficient in the visible region, direct and tunable band gap, ambipolar transport of charges, high exciton mobility, and long diffusion lengths. In a typical PSC, the photoabsorber layer is composed of perovskite sandwiched between an electron transport layer (ETL) and a hole transport layer (HTL). The operation principle starts with light absorption by perovskite to generate the electron-hole pair, followed by charge separation and the flow of electrons through the external circuit to produce an electric current. Perovskite solar cells can be arranged in regular or inverted configurations. The regular configuration is originated from solid-state DSSCs and is characterized by layers in the order of FTO/ETL/perovskite/HTL/metal. The inverted configuration originates from regular organic solar cells with the ETL and HTL layers in inverted positions. The structural organization of the perovskite layer also imparts different optoelectronic properties to the device, potentially leading to improvements in stability, conversion efficiency, and charge transport. Fully inorganic perovskites such as SrTiO₃, BaTiO₃, and Pb(Zr, Ti)O₃ have been extensively explored