<p>The objective of this work is to prepare the Pd-decorated WS₂ nanostructures using a hydrothermal technique, which is subsequently utilized in designing a photodetector device for detecting different wavelengths of the solar spectrum. Broadband photodetection can be significantly enhanced by developing transition metal dichalcogenides with tunable band gaps and unique electrical and optical properties. The X-ray photoelectron spectroscopy analysis has confirmed the presence of W⁴⁺ oxidation states, as evidenced by the observation of peaks corresponding to W5p_3/2, W4f_3/2, and W4f_7/2 with binding energies of 37.83, 34.36, and 32.29&#xa0;eV respectively. Plasmonic photodetector offers advantageous characteristics such as the ability to provide photodetection of different wavelengths by a single photodetector device. WS₂ exhibits a notable responsivity of 125&#xa0;mA·W⁻¹ and a detectivity of 8.40 × 10¹⁰&#xa0;cm·Hz^1/2·W⁻¹. On decorating with Pd, the responsivity and detectivity of the device increase up to 4.25 A·W⁻¹ and 1.16 × 10¹⁴&#xa0;cm·Hz^1/2·W⁻¹,&#xa0;respectively. By utilizing the plasmons at the semiconductor surface, a surface plasmon effect has been produced, thereby increasing the photocurrent value and offering numerous advantageous features.</p>