Abstract
CuSe have been synthesized through chemical route at 0.5 M, 0.05 M and 0.005 M molar concentration using the polyvinylpyrrolidone (PVP) as a capping agent. The structural and optical characterization are done by XRD, UV–Vis, PL spectroscopy. XRD result confirms the formation of mixed type structure comprising hexagonal wurtzite phase, cubic along with some oxide traces. The UV–Vis spectra shows blue shift from bulk CuSe which clearly implies the quantum confinement of the as synthesized nanoparticle. The direct and indirect band gaps of CuSe are found to be enhanced upto 3.7 eV and 2.0 eV respectively on lowering the molar concentration. After ageing for 45 days the band gaps are found to decrease which is attributed to incorporation of defects that makes the agglomeration of particles. PL emission spectra of all the samples show band gap emission near UV-blue region. The band emission also shows a clear blue shift and varying from 418 nm to 397 nm in accordance with a decrease of molarity. The PL intensity is found to be enhanced for CuSe prepared at low concentration. Pl peaks are flattened covering more wavelength in near UV to blue-yellow region after ageing. Also the PL intensity enhanced along with a red shift of band emission.
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