Structural and Optical Characterization of Tungsten Diselenide Crystals Grown by DVT Technique

Abstract

WSe2 is a member of groupVI Transition Metal Dichalcogenides (TMDCs) and has been observed to be a highly stable semiconducting material. It has been grown in crystal form using a direct vapour transport technique in present case. The grown WSe2 crystals were characterized for the structural properties using X-ray diffraction technique (XRD). The hexagonal structure was confirmed through this analysis. Using the data of XRD, various parameters like crystalline size, lattice parameters, micro strain, dislocation density, unit cell volume, unit cell density, growth fault and deformation fault probability etc were found. It was seen that the micro strain, dislocation density and growth & deformation fault probabilities were found to be very low in WSe2 crystals. The grown WSe2 crystals were characterized for optical properties using UV-VIS-NIR spectroscopy. The absorption spectra of WSe2 grown in present case revealed the fact that WSe2 posses direct band gap around 1.38eV. Layered di-chalcogenides WSe2 (or MoSe2) are used for desired applications such as in photo-conversion devices.

Performance analysis of WSe2-based bifacial solar cells with different electron transport and hole transport materials by SCAPS-1D

“…Different methods such as soft selenization [ 15 , 27 ], high temperature selenization [ 28 ], physical vapor transport [ 29 ], chemical bath deposition [ 30 ], electrodeposition [ 31 ], pulsed laser deposition [ 32 ], Se–oxygen ion exchange [ 33 ], and atmospheric pressure chemical vapor deposition [ 34 ], have been used successfully to synthesize high quality WSe 2 thin films. Recently, Hongchao Li et al.…”

Synthesis and Characterization of Highly Crystalline Vertically Aligned WSe2 Nanosheets

“…The attractive reported properties and potential applications of WSe 2 materials require a well-controlled synthesis, in terms of their structure, including the number of layers, crystallographic phase composition, or/and film morphology. For this purpose, different synthesis techniques, such as chemical-vapor transport using a sealed ampoule containing W and Se materials under a vacuum and heated at a high temperature [4,[12][13][14], chemical and mechanical exfoliation [15,16], physical techniques (molecular beam epitaxial growth [17], pulsed laser deposition [18], and magnetron sputtering of W in an Se-rich atmosphere [6]), chemical approaches (colloidal method [19,20] and electrodeposition [21]), and atmospheric pressure chemical vapor deposition (APCVD) [22][23][24][25][26], have been used to obtain WSe 2 . The majority of recent studies are focused on the synthesis of 2D WSe 2 , with domains of different shapes and sizes.…”

Effect of magnetron sputtering parameters and stress state of W film precursors on WSe2 layer texture by rapid selenization

“…Soft selenization10, physical vapor transport11, electrodeposition12, pulsed laser deposition13, selenium–oxygen ion exchange14, and atmospheric pressure chemical vapor deposition15 have been reported to fabricate WSe 2 film. Among these synthetic methods, an environmentally friendly method by soft selenization of the W film has gained superiority and may be ready for potential development.…”