Driven by the increasing demand for building-integrated photovoltaics and space photovoltaics, flexible perovskite solar cells have demonstrated tremendous application potential and have emerged as one of the most active research frontiers in photovoltaic technology, owing to their outstanding power conversion efficiency, low-cost fabrication, excellent mechanical flexibility and high power-to-weight ratio. Nevertheless, the perovskite thin films serving as the photoactive layer exhibit a certain degree of soft-lattice characteristics, their intrinsically polycrystalline nature and lattice brittleness render them susceptible to structural damage under bending and mechanical deformation. Moreover, the mechanical durability of flexible perovskite solar cells is strongly governed by the mechanical properties of the individual functional layers and the interfacial bonding states between them, collectively constitute a critical bottleneck for their practical deployment and large-scale commercialization. In this context, this review systematically summarizes recent advances in enhancing the mechanical durability of flexible perovskite solar cells, with particular emphasis on flexible substrates, perovskite active layers, electrodes, and interface engineering. The major approaches for improving the mechanical durability of flexible perovskite solar cells are comprehensively reviewed, and the future prospects and key development directions for advancing flexible perovskite solar cells toward commercialization are further discussed.

flexible perovskite solar cells  /  mechanical durability  /  interface engineering  /  flexible substrates  /  composition engineering