Abstract
Transition Metal Dichalcogenides (TMDCs) are considered necessary two-dimensional materials in the field of thermoelectricity due to tunable band structure, large effective mass, valley degeneracy and so on. So, in this work, among the TMDCs, the thermoelectric response of mechanically exfoliated Tungsten Disulphide (WS2) has been explored to achieve environment-friendly refrigeration and energy harvesting. Herein, we fabricated the WS2 thermoelectric device through the mechanical exfoliation technique. A few layers of exfoliated WS2 flake were characterized with Raman Spectroscopy, and a thickness of 4.2 nm (∼6 layers) was confirmed through Atomic Force Microscopy. Thermoelectric measurements were carried out using the 2ω method, and the Seebeck coefficient of about ∼ -389 μV/K was recorded at room temperature. The electric and thermoelectric characteristics reveal the n-type conduction in the device and show good mobility of 16.5 cm2V-1s-1. This study experimentally validates the potential of mechanically exfoliated n-type WS2 in thermoelectricity generation.
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