Evaluation the impact of temperature on the photodetection properties of V2O5/PANI nanocomposites

V2O5/PANI nanocomposites were created using a hydrothermal method at 180 °C and 200 °C and then coated on p-type silicon substrates for photodetectors. The 180 °C sample showed better crystallinity with smaller crystals, more evenly distributed nanoparticles, and a more uniform surface than the 200 °C sample. FESEM and atomic force microscopy (AFM) analyses indicated enhanced surface homogeneity, distinct nanostructures, and improved charge-separation efficiency in the 180 °C sample. Raman spectra suggested better structural organization, while PL measurements revealed increased light-emission efficiency. The photodetectors were active in the 500–680 nm range, optimizing photodetection performance. The sample fabricated at 180 °C exhibited improved results compared to the one at 200 °C, with a photoresponse of 0.14 A/W, a detectivity of 1.58 × 1020 Jones, and an external quantum efficiency (EQE) of 55.41%. It also had a faster rise time and a steadier photoresponse, highlighting the importance of synthesis temperature in improving the structure and function of V2O5/PANI nanocomposite photodetectors.