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We have developed MoS 2 nanosheets and CdMoS 4 hierarchical nanostructures based on a UV light photodetector. The surface morphologies of the as-prepared samples were investigated via field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The performance parameters for the present photodetectors are investigated under the illumination of UV light having a wavelength of ∼385 nm. Upon the illumination of UV light, the CdMoS 4 -based photodetector device showed a better response to UV light compared to the MoS 2 device in terms of photoresponsivity, response time (∼72 s) and recovery time (∼94 s). Our results reveal that CdMoS 4 hierarchical nanostructures are practical for enhancing the device performance., Competing Interests: There are no conflicts of interest to declare., (This journal is © The Royal Society of Chemistry.)