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.
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