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Methylammonium lead iodide (CH₃NH₃PbI₃) perovskite solar cell (PSC) is one of the third generations of photovoltaic (PV) research interest in recent years. The solar cell degrades very fast in ambient air and this poses major challenge for its commercialization. Hence, this report investigates surface-passivated perovskite layer using hydrophobic material, 4-tertbutylpyridine (tBP), to modify the surface of the perovskite layer and create ambient air-resistant layer that results in improved stability of PSC performance. The fabricated films and devices were studied using UV–Vis spectrophotometer, Fourier-transform infrared (FTIR) spectrometer, Scanning Electron Microscopy (SEM), solar simulator equipped with Keithley source meter and X-ray diffractometer (XRD). The concentration of tBP was varied from 50 to 200 μl and the samples were aged in ambient air for 120 h. Eventually, the surface passivated film and the …