Characterization of CdS and ZnS Nanoparticle Semiconductors: for Optoelectronics Application

Suryajaya Suryajaya, A.V. Nabok, A. K. Hassan, A. Tsargorodskaya

Abstract


In this work, CdS and ZnS semiconducting colloid nanoparticles coated with organic shell, containing either SO−3 or NH+ 2 groups, were deposited as thin films using the technique of electrostatic self-assembly. The films produced were characterized with UV-vis spectroscopy - for optical properties; mercury probe - for electrical characterisation; and photon counter - for electroluminescence study. UV-vis spectra show a substantial blue shift of the main absorption band of both CdS and ZnS, either in the form of solutions or films, with respect to
the bulk materials. The calculation of nanoparticles’ radii yields the value of about 1.8 nm for both CdS and ZnS. Current-voltage (I-V) and capacitance-frequency (C-f) measurements of polyelectrolyte/nanoparticles (CdS or ZnS) films suggest the tunnelling behaviour in the films while capacitance- voltage (C-V) and conductancevoltage (G-V) measurements suggest that these nanoparticles are conductive. The electroluminescence was detected in sandwich structures of (PAH/CdS/PAH)N using a photon counting detector, but not in the case of ZnS films.

Keywords


Nanoparticles; polyeectrolyte; CdS; ZnS; mercury probe; electroluminescence

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DOI: http://dx.doi.org/10.12962/j24604682.v7i1.899

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