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Hybrid organic-inorganic perovskite solar cells have great attention as good alternative for replacing conventional silicon solar cells due to their high-performance and low-cost processing. Nowadays, the power conversion efficiency (PCE) of perovskite solar cells has reached more than 22% which is comparable with commercially available silicon solar cells. However, their low-stability in high humidity hinders the commercialization of perovskite solar cells. Therefore, the research of perovskite solar cells is now shifted to stability study rather than achieving high performance. We have prepared perovskite from mixed methylammonium iodide (MAI) and lead (II) iodide or PbI2 as active layer of solar cells with structure hole-transport-layer (HTL) free consisted of Glass/FTI/TiO2/ZrO2/perovskite/carbon. Due to its instability of MAI on humidity, we have doped MAI with Cesium to improve both performance and stability of perovskite solar cells. We have varied the concentration of cesium ranging from 5% to 20%. The stability study was conducted at room temperature (25C) and room relative humidity (80-85%). We have used white LED with intensity 100 mW/cm2 as light source in current-voltage measurement of solar cells. We have found that the highest PCE and stability of perovskite solar cells was achieved by doping 10% of Cesium.