Growth and characterization of WSe2 single crystals using TeCl4 as transport agent

Highlights

•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.

Keywords:  A1. Characterization;  A1. Crystal morphology;  A2. Single crystal growth;  B1. Inorganic compounds;  B2. Semiconducting materials; B3. Solar cells

Source: Sciencedirect

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