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 W5p3/2, W4f3/2, and W4f7/2 with binding energies of 37.83, 34.36, and 32.29 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 mA<middle dot>W-1 and a detectivity of 8.40 x 10(10) cm<middle dot>Hz1/2<middle dot>W-1. On decorating with Pd, the responsivity and detectivity of the device increase up to 4.25 A<middle dot>W-1 and 1.16 x 10(14) cm<middle dot>Hz(1/2)<middle dot>W-1, 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.
