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 Fe 3 O 4 over MoS 2 for the efficient photocarrier generation in broadband spectral region. The structural, morphological, and optical properties of MoS 2 , Fe 3 O 4 and MoS 2 /Fe 3 O 4 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 MoS 2 , Fe 3 O 4 and MoS 2 /Fe 3 O 4 composites. FESEM display a flower-like morphology for pristine MoS 2 and an octahedral structure for pristine Fe 3 O 4 . Raman spectroscopy indicated two vibrational modes E 2 g 1 and A 1g of MoS 2 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 MoS 2 and MoS 2 /Fe 3 O 4 PDs were evaluated under dark and light illumination. The nanocomposite showed maximum responsivity of 10.1 µA W −1 and a specific detectivity of 10 5 Jones. Fabricated PDs show a highly stable response throughout the cycle.