Abstract
Transition metal dichalcogenides (TMDCs) has gained vast attraction in academia and industry due to their outstanding optical and electrical properties. Among them, molybdenum disulfide (MoS 2 ) is a promising material in the field of thermoelectric due to its high effective mass, van der Waal’s interaction and anisotropy. In this work, layered structure of molybdenum disulfide is prepared by hydrothermal method and coated on ITO/PET flexible substrate by doctor blade method. The thermoelectric properties of MoS 2 are improved with the effect of carbon nanotubes (CNTs) by fabricating the film via layer-by-layer assembly and heterojunction. The presence of ( E 1 2g and A 1g ) modes and (D, G and G ’ ) band from Raman spectra confirmed the formation of MoS 2 and CNT, respectively. Further the chemical composition is also confirmed from the presence of oxidation states XPS. The maximum achieved Seebeck coefficient ( S ), electrical conductivity (σ) and power factor ( S 2 σ ) values are -19.45 µV/K, 430 S/m and 160 nW/mK 2 at 315 K, respectively, for heterojunction. The achieved maximum power factor for heterojunction is due to the energy carrier filtering effect at the interface of MoS 2 and CNT. The current research work paves a new strategy to design a flexible thermoelectric device. • The MoS 2 and CNTs films was fabricated on the flexible PET/ITO substrate by layer-by-layer assembly and heterojunction using doctor blade method. • The energy filtering effect is a strategy for improving the electrical conductivity and Seebeck coefficient. • The heterojunction (HM) MoS 2 /CNTs film showed high Seebeck coefficient, electrical conductivity and power factor of -19.5 µV/K, 430 S/m and 162.8 nW/mK 2 .
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