Sonochemical exfoliation and photodetection properties of MoS2 Nanosheets. (1st August 2019) - Bhakhar, Sanjay A.
Abstract: Atomically thin layers of transition metal dichalcogenides (TMDCs) have shown great promise for the applications in the field of optoelectronics. TMDCs have drawn huge attention of researchers in recent past due to their unique layer dependent properties. Here, we report the high yield synthesis of atomically thin MoS2 Nanosheets. The Nanosheets are synthesized by sono-chemical exfoliation technique. The exfoliated MoS2 have 2H-hexagonal lattice structure with P 63 / mmc space group. The Raman spectrum shows the resonances corresponding to A1g and E2g vibrational modes of 2H-MoS2 . The lateral morphology of MoS2 Nanosheets is observed by transmission electron microscopy. The SAED pattern depicts the highly crystalline nature of Nanosheets. The absorption spectrum of MoS2 Nanosheets shows A and B excitonic resonances corresponding to direct inter-band transition at 1.82 eV and 2.0 eV, respectively. Moreover, the photo detector based on MoS2 Nanosheets is fabricated and studied under periodic 670 nm illumination of power intensity 3 mW/cm 2 . The fast response with enhanced photo responsivity of 16.93 mA/W and specific detectivity of 5.12 × 10 8 Jones is observed. Overall, the present findings demonstrate high yield synthesis of Nanosheets with good quality to be used for photodetector.