Abstract
Cadmium Selenide nanoparticles (CdSe NPs) deposited on ITO substrates were prepared in aqueous solution by spin-coating method using L-Cysteine as organic stabilizer. The effect of solution temperature (ST) on the morphological and optical properties of CdSe NPs, deposited on ITO substrates was investigated by Atomic force microscopy (AFM), UV–Vis absorption, photoluminescence (PL) and time resolved photoluminescence (TRPL) spectroscopy. Results showed that increasing in the ST up to 70°C improved the crystalline quality of the CdSe NPs, decreased their band gap energy and enhanced the PL intensity. Higher solution temperature induced a reduction in PL intensity with a blue shift of the emission wavelength, which is attributed to quantum confinement effect. The TRPL measurements showed two PL decay times attributed to radiative recombination processes, and the trapping of carriers at the surface states. After heat treatment of the CdSe NCs solution, the decay components were predominated by the fast decay time (89%) suggesting the good surface passivation of nanocrystals.
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