Electrosynthesis and characterisation of n-WSe2 thin films

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.…”

Copper‐alloyed ZnS as a p‐type transparent conducting material

“…The α phase was chosen for this investigation as it can act as a template for the subsequent synthesis and investigation of chalcogenide absorber materials for PV and there currently exist no p‐type wurtzite TCMs 12. In addition, α‐ZnS has acceptable lattice matching with a number of n‐type absorbers such as WSe 2 which has a direct bandgap of 1.46 eV 13 and MoSe 2 with a direct bandgap of 1.43 eV 14. The α phase of ZnS has a band gap of 3.7 eV making it completely transparent in the optical regime of interest for PV 15; however, intrinsic ZnS is a band insulator with a low carrier density and is thus unsuitable as a contact.…”

Facile Synthesis of WSe2 Nanoparticles and Carbon Nanotubes

“…Nanoparticles of WSe 2 can be synthesized by a chemical reaction between W(CO) 6 and selenium dissolved in a para -xylene solution. WSe 2 thin films can be obtained by many processes, such as the reaction of WO 3 thin films in a H 2 Se atmosphere, a solid-state reaction between the constituents sequentially deposited in a thin film form, electrodeposition, rf sputtering, and van der Waals rheotaxy. − Single crystals of WSe 2 were grown via a vapor-transport technique, employing SeCl 4 , chlorine, or iodine as a transport agent. Although a few papers have already reported on the chemical vapor deposition (CVD) of WSe 2 , it is difficult to handle WF 6 and H 2 Se as precursors because they produce HF as a byproduct of the reaction. − Films of WS 2 were grown on different substrates between 300−700 °C and were reported to be stable and crystalline with a preferential orientation.…”