In this perspective research, methyl violet 6B, a nanocrystalline dye, is exploited as an impregnating material for improving the absorption and photoconductivity characteristics of polyvinyl alcohol, PVA. The PVA-MV composite thin film's structure and morphology revealed a uniform smooth surface with 9.7 nm root mean square roughness. The optical absorption of PVA thin film is enhanced after the dye incorporation and exhibited an energy gap modification from 4.36 to 1.75 eV. Moreover, we fabricated an Ag/PVA-MV/p-Si/Al MIS Schottky diode and investigated its electrical characteristics in dark. The heterojunction's microelectronic parameters such as ideality factor, reverse saturation current, barrier height, rectification ratio are estimated and found to be 2.5, 6.4 nA, 0.78 eV, and 8795.2 at 3 V, respectively. A significant quasi-saturated reverse photocurrent with obvious sensitivity for light intensity variations is detected. The fabricated photodetector exhibited responsivity, specific detectivity, and signal-to-noise ratio ~ 2.622 mA/W, 6.46 × 109 Jones, and 407.9, respectively.