Growth and Characterization of Nickel Diselenide by Direct Vapour Transport Method

Abstract

-The TMDC (Transition Metal Dichalcogenide) crystals are widely useful and commonly
studied because of their remarkable properties, including a tuneable band gap. These materials
having ‘MX2’ type of arrangement can be easily exfoliated because of the weak Vander Waal’s
forces between X-M-X layers, where X is a chalcogen atom (Se, S or Te etc.) and M (Mo, Nb, Re,
Hf etc.) a transition metal. The work focuses growth of NiSe2 by Direct Vapor Transport (DVT)
method with the use of dual zone furnace. PXRD pattern confirmed the polycrystalline nature of the
prepared sample and orientation for the growth was equal at (200) and (311) planes and
microstructural parameters, HRTEM-SAED images, SEM-EDX studies confirm the sample
preparation and UV-VIS-NIR an indirect and direct bandgap of the sample was calculated to be 2.86
eV and 3.43 eV and absorption spectra between 298 nm to 702 nm are utilized for identifying their
structural, morphological and optical studies.