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Graphene and transition metal dichalcogenides (TMDCs), an emerging class of two-dimensional (2D) materials exhibiting excellent electrical and optical properties have shown a phenomenal advancement in optoelectronics and electronic technology. However, two-dimensional van der Waals heterostructures have gained profound interest due to additional functionalities over usual 2D devices. Here we demonstrated the photoconductive response of graphene-WS₂ heterostructure at different backgate (V_g) and drain-source voltages (V_ds) as a function of time, under UV illumination. An increase in photocurrent characteristics is observed as V_ds varies from 0.3 V to 1 V. The response of photosensivity is tuned by varying the backgate voltage. The optical performance of graphene-WS₂ phototransistor is evaluated by investigating the photoresponsivity (R_λ), detectivity (D^*), external quantum efficiency (EQE) and …