Abstract
Gallium sulphide (GaS) has been prepared by chemical vapour transport (CVT) and physical vapour transport (PVT). The obtained crystals show two different morphologies: large layers and little microstructures respectively, both indicated hexagonal crystal structure.Energy-dispersive X-ray spectroscopy (EDX) measurements confirm the correct stoichiometry; the hexagonal structure has been confirmed with x-ray analysis and transmission electron observations (TEM).Optical study by cathodoluminescence shows direct bandgap with energy gap at 2.5 eV for both samples.
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