Abstract
In this present work, a facile method for the synthesis of CdS nanocrystals (NCs) has been developed by using benzyl alcohol as solvent and thiourea as sulfur source in open-air conditions. The compositional, morphological, structural, optical and photoelectrochemical properties of CdS NCs were characterized. The scanning electron microscopy and transmission electron microscopy observations reveal that as-prepared CdS sample has a smooth surface and is uniform in crystallinity with grain sizes smaller than 20nm. Compositional analysis carried out by energy dispersive spectroscopy indicates a 1:1 stoichiometry. X-ray diffraction confirms the formation of wurtzite structure. X-ray photoelectron spectroscopy demonstrates the surface composition is slightly Cd-rich. Ultraviolet-visible transmission spectrum gives a band gap at 2.44eV. The photoelectro- chemical measurement results confirm the n-type conductivity and good photocurrent stability. Mott-Schottky plot shows that the flat band potential of CdS NC films lies around −0.44V. From the intensity modulated photocurrent spectroscopy, it was found that more positive potential leads to a decrease in the rate constant ratio between product separation and recombination.
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