<p>This study investigates the performance improvement of perovskite solar cells type CH₃NH₃PbI₂Cl fabricated by pulsed laser deposition technique (PLD). The fabricated cells were treated through solvent vapor annealing and the effect of annealing on the structural, optical, and electrical properties was examined. The results demonstrated that solvent annealing enhances the crystallinity of the films by increasing crystal size and reducing structural defects and distortions, which in turn will positively impact the stability and performance of the films. X-ray diffraction (XRD) analysis revealed an improvement in the crystal lattice arrangement and a reduction in distortion density. It was also observed that solvent annealing improves the optical properties of the films, with light absorption significantly increased in the range of 400–800&#xa0;nm, which results in enhancing light harvesting. The electrical conductivity of the films increased from 3.8 × 10⁻⁸ S/cm to 7.2 × 10⁻³ S/cm after solvent annealing, with a significant increase in the concentration and charge carriers mobility. The photovoltaic (PV) performance exhibited a considerable improvement in power conversion efficiency with an increase from 0.01% for untreated films to 14.88% for treated films at a laser power density of 0.5&#xa0;J/cm². However, a deterioration in PV performance occurred when the laser power density was increased to 1.0&#xa0;J/cm² and 1.5&#xa0;J/cm² due to thermal effects and resulting structural deformations.</p>