This review summarizes the advancements in materials chemistry for metal halide perovskite photovoltaics. Metal halide perovskites, with the general formula ABX₃, have shown exceptional performance in solar cells, achieving power conversion efficiencies (PCE) over 26% for single-junction devices and 33.7% for tandem devices. The key to these improvements lies in materials chemistry, particularly in the development of high-purity precursor materials, tailored inks for large-area printing, and methods for nucleation and crystallization. These advancements have enabled the fabrication of high-quality perovskite films, which are essential for efficient solar cells. The research highlights the importance of material purity in achieving reproducible high-quality perovskite films. High-purity precursors, such as PbI₂ and SnI₂, were developed to ensure consistent performance. The study also explores the unique properties of perovskites, including their direct bandgap nature and high absorption coefficients, which contribute to their excellent photovoltaic performance. Advanced spectroscopy techniques have revealed the photophysical properties of perovskites, including their emissive characteristics and the role of localized states in photon recycling. The fabrication of perovskite films is a critical area of research, with various methods developed to achieve dense, flat, and high-quality films. Techniques such as antisolvent treatment and solvent vapor annealing have been employed to control nucleation and crystallization, leading to improved film quality. The development of charge-collecting materials, such as p-type and n-type semiconductors, has also been crucial for efficient charge extraction from perovskite layers. These materials are designed to have optimal energy levels for efficient carrier transport. Interface modification is another important aspect, with surface passivation materials used to suppress ion migration and improve device durability. The use of organic cations and anions as surface modifiers has been shown to enhance the performance of perovskite solar cells. Additionally, the development of monolayer charge collection materials, such as PATAT, has enabled more efficient charge extraction with improved durability. Overall, the research emphasizes the role of materials chemistry in advancing perovskite photovoltaics, with a focus on improving efficiency, stability, and scalability. The integration of these materials and techniques is expected to lead to further improvements in perovskite solar cells, making them a promising renewable energy source for the future.This review summarizes the advancements in materials chemistry for metal halide perovskite photovoltaics. Metal halide perovskites, with the general formula ABX₃, have shown exceptional performance in solar cells, achieving power conversion efficiencies (PCE) over 26% for single-junction devices and 33.7% for tandem devices. The key to these improvements lies in materials chemistry, particularly in the development of high-purity precursor materials, tailored inks for large-area printing, and methods for nucleation and crystallization. These advancements have enabled the fabrication of high-quality perovskite films, which are essential for efficient solar cells. The research highlights the importance of material purity in achieving reproducible high-quality perovskite films. High-purity precursors, such as PbI₂ and SnI₂, were developed to ensure consistent performance. The study also explores the unique properties of perovskites, including their direct bandgap nature and high absorption coefficients, which contribute to their excellent photovoltaic performance. Advanced spectroscopy techniques have revealed the photophysical properties of perovskites, including their emissive characteristics and the role of localized states in photon recycling. The fabrication of perovskite films is a critical area of research, with various methods developed to achieve dense, flat, and high-quality films. Techniques such as antisolvent treatment and solvent vapor annealing have been employed to control nucleation and crystallization, leading to improved film quality. The development of charge-collecting materials, such as p-type and n-type semiconductors, has also been crucial for efficient charge extraction from perovskite layers. These materials are designed to have optimal energy levels for efficient carrier transport. Interface modification is another important aspect, with surface passivation materials used to suppress ion migration and improve device durability. The use of organic cations and anions as surface modifiers has been shown to enhance the performance of perovskite solar cells. Additionally, the development of monolayer charge collection materials, such as PATAT, has enabled more efficient charge extraction with improved durability. Overall, the research emphasizes the role of materials chemistry in advancing perovskite photovoltaics, with a focus on improving efficiency, stability, and scalability. The integration of these materials and techniques is expected to lead to further improvements in perovskite solar cells, making them a promising renewable energy source for the future.