Controlled addition of Fe3O4 for enhancing photocarrier generation in MoS2 visible light photodetector

Visible light photodetectors (PDs) play a pivotal role in a diverse range of applications, including imaging, optical communication, sensing, and biomedical diagnostics. In this work, we did an investigation on the systematic study of the influence of Fe3O4 over MoS2 for the efficient photocarrier generation in broadband spectral region. The structural, morphological, and optical properties of MoS2, Fe3O4 and MoS2/Fe3O4 composites were studied using X-ray diffraction, Field Emission Transmission Electron Microscope (FESEM) and UV-Vis absorption. The structural findings from X-ray diffraction suggest the formation of pristine MoS2, Fe3O4 and MoS2/Fe3O4 composites. FESEM display a flower-like morphology for pristine MoS2 and an octahedral structure for pristine Fe3O4. Raman spectroscopy indicated two vibrational modes E-2g(1) and A(1g) of MoS2 that correspond to in-plane vibration of sulphur and molybdenum atoms and out-plane vibration of sulphur atoms, respectively. The current-voltage (I-V) characteristics of MoS2 and MoS2/Fe3O4 PDs were evaluated under dark and light illumination. The nanocomposite showed maximum responsivity of 10.1 mu A W-1 and a specific detectivity of 10(5) Jones. Fabricated PDs show a highly stable response throughout the cycle.