: Solution-processed metal halide perovskites (MHPs) have been rapidly developed worldwide, with much attention to fluid dynamic, fluid crystallization, and fluid interfaces, all falling within the realm of fluid chemistry. It is widely recognized that the theory of fluid chemistry has been proven to provide an effective means for the improvement of perovskite crystallization and the enhancement of perovskite solar cells (PSCs) performance. In this review, the fluid behavior, microfluidic synthesis, and aging process of perovskite materials are first investigated, with emphasis on the related improvement methods and chemical mechanisms. Second, the internal crystallization chemistry, external interface chemistry, and the large-area PSCs based on the fluid chemistry are discussed. Finally, four specific direc tions for future studies of fluid chemistry of MHPs are proposed, aiming to harness the theoretical advantages of fluid chemistry and contribute to the industrialization of PSCs. 1. Introduction Metal halide perovskite solar cells (PSCs) have achieved a power conversion efficiency (PCE) that is now competitive with that of silicon photovoltaic cells, owing to their versatility in molecular designs, lightweight nature, easy processability, and integration potential into diverse applications.[1–5] In comparison with traditional photoelectric devices, solutionprocessed devices benefit from the layer-by-layer solution process, which enables them to have high material utilization, low
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