Photodetectors are the significant constituents of photonics that collect incident light and convert it into rational electrical output and playing a crucial role in numerous optoelectronic ingestions in both military and civil fields, such as optical communications, non-destructive inspection, biomedical imaging, and so on. [1][2][3] Photodetector work on the basis of photoelectric effect, by means of the light-to-electricity conversion through the surface of semiconducting material which acts as the active layer. [4] Photodetectors based on organic/inorganic perovskites are active building blocks for modern physics comprising optoelectronic mechanisms. [5] All-inorganic cesium lead halide perovskite CsPbX 3 (X = Cl, Br and I) nanocrystals (NCs) have received great attention owning to their superior properties, such as long carrier diffusion length, high defect tolerance and low value of deep trap states. [6,7] The low-cost and facile synthesis procedure along with excellent ambient stability make them an ideal contender and extensively investigated in numerous optoelectronics devices. [8] The tunable optical and electric properties of CsPbX 3 are highly preferred for their potential usage in light emitting diode (LEDs), solar cell and photodetectors. [9] The performance of CsPbBr 3 NCs-based devices are mainly limited attributed to lower value of carrier mobility due to formation of long chain alkylamine ligands and presence of mid-gap trap states. [10,11] The alkylamine ligands (Oleic acid, Oleylamine) provide the necessary colloidal passivation and mid gap trap state