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In the present investigation,we fabricated strontium(Sr2+)incorporated CsPbI2Br-based inorganic per-ovskite solar cells in ambient conditions.The morphology,crystallinity,absorption,elemental composi-tion and photoluminescence analysis of the bare CsPbI2Br and CsPb1-xSrxI2Br perovskite thin films were studied systematically to investigate the role of Sr2+incorporation.It is observed that the surface mor-phology of the CsPbI2Br perovskite thin film has been improved by partial substitution of Pb2+by Sr2+which facilitates photoactive black phase-stabilization and defect passivation.The champion device hav-ing CsPb0.98Sr0.02I2Br composition exhibited a power conversion efficiency(PCE)of 16.61％which is much higher than the bare device(13.65％).Furthermore,our CsPb0.98Sr0.02I2Br-based devices maintain＞85％of its initial efficiency over 100 h in ambient conditions.