This study focuses on optimizing the fabrication of mid-wavelength infrared (MWIR) PbSe photodetectors, widely used in commercial, medical, environmental, industrial, and military applications due to their reliable, cost-effective performance at room temperature.Using chemical bath deposition (CBD), we identified unique snowflake-like patterns on PbSe surface, containing embedded nano-prisms.These formations are linked to PbSe recrystallization during the oxygen sensitization process.The research examines how these patterns evolve-forming, expanding, and eventually reducing-under varying oxygen exposure times and temperatures.Optimal detector performance is observed when snowflake density is highest, as indicated by enhanced photoluminescent (PL) output.Beyond a specific threshold, however, increased temperature leads to a reduction in pattern size and a decline in performance.By employing spectroscopic (PL/FTIR, UV-Vis) and structural (XRD, XPS, Hall-effect) analyses, the study demonstrates that snowflake morphology serves as a visible marker of ideal CBD conditions for producing high-sensitivity PbSe photoconductive detectors.