Redefining Sustainability Pathways for Metal Halide Perovskite Optoelectronics

ABSTRACT Metal halide perovskites have emerged as highly promising materials for next‐generation optoelectronic devices; however, concerns regarding toxicity, energy‐intensive fabrication, and end‐of‐life management remain critical barriers to their sustainable deployment. This review provides a comprehensive overview of recent advances in green and renewable processing strategies for metal halide perovskites, with a particular focus on environmentally benign material design and device fabrication. We first discuss the development of non‐toxic, lead‐free perovskite materials, highlighting the most promising candidates based on performance, stability, and elemental abundance. Subsequently, progress in green solvent engineering, including bio‐derived and low‐toxicity solvent systems, is summarized with an emphasis on solvent–perovskite interactions and process compatibility. We then examine green and low‐energy fabrication processes, such as low‐temperature, vacuum‐free, and scalable coating techniques, which significantly reduce energy consumption and carbon footprint. The importance of intrinsic material stability is further discussed as a key criterion for sustainable perovskite technologies, as prolonged operational lifetimes directly translate into reduced environmental impact. Finally, emerging recycling and circular‐economy strategies for perovskite devices are reviewed, addressing material recovery, substrate reuse, and end‐of‐life considerations. By integrating material, process, stability, and recycling perspectives, this review outlines a holistic framework toward truly sustainable metal halide perovskite technologies.