An analytical model based on a detailed balance theory has been adopted to obtain the performance limitation of a Cs3Sb2Br9-based perovskite solar cell (PSC). Two different structures surrounded by the angular reflection layer at the front along with a perfect mirror and an absorbing substrate at the rear surface, individually, are investigated. The performance analysis of both structures on the cell is done by tuning the angle of incident sunlight. The obtained result highlights an increment of 1.6% in the performance for the perfect mirror-based structure as compared to the other structure. The obtained result signifies a good performance of the Cs3Sb2Br9-based PSC for a plane wave (90º). The proposed analytical model and corresponding results can be used as a suitable model for estimating the performance parameters of the PSC for various materials.