Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1789456 | Journal of Crystal Growth | 2016 | 8 Pages |
•WSe2 single crystals (25–100 mm2) grown by the chemical vapor transport method.•High quality single crystals obtained from slowly cooled polycrystalline powders.•WSe2 single crystals with a photocurrent plateau at 75 mA cm−2.
The growth of WSe2 single crystals, using TeCl4 as transport agent was performed successfully from slowly cooled polycrystalline powders as precursors. The resulting single crystals were characterized by X-ray diffraction (XRD) and their surfaces examined by scanning electron microscopy (SEM) presented fewer defects than single crystals prepared from air-quenched polycrystalline powders. Energy Dispersive X-ray microanalysis (EDX), inductively coupled plasma (ICP) spectroscopy and X-ray photoelectron spectroscopy (XPS) revealed that the single crystals are homogeneous and stoichiometric. Electrical conductivity and photocurrent measurements have confirmed the semiconducting character of the single crystals and a photocurrent of 75 mA cm−2 has been reached. In addition, single crystals with areas in the 25–100 mm2 range can be obtained under the reported growth conditions.