Insights into the photo-sensing properties of nanostructured BaTiO₃/Si photodetector

BaTiO₃ has garnered significant interest in recent years for applications in microelectronics and various photovoltaic applications. In this paper, we report on the influence of laser fluence on the characteristics of BaTiO₃ nanostructured films deposited by the pulsed laser deposition route. The structural, morphological, and optical properties of the grown film are characterized using field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), atomic force microscopy (AFM), and UV–Vis optical absorption. The optical properties confirm that the optical energy gap of the BaTiO₃ nanostructured film decreases from 3.9 to 3.6 eV as the laser fluence increases from 8.2 to 10.1 J/cm². The effect of laser fluence on the figures of merit and performance of the BaTiO₃/Si photodetector was studied. The high performance photodetector fabricated at a laser fluence of 8.9 J/cm², exhibiting a responsivity of 9.2 AW⁻¹ at 500 nm and a detectivity of 4.62 × 10¹² Jones. Photodynamic response time of the photodetector as a function of laser fluence was determined.