Optical analysis of Hybrid quantum dots deposited by SILAR method

Document Type : Original Article

Authors

1 Physics Department, Faculty of Science, Zagazig university, Zagazig, Egypt

2 Egyptian Petroleum Research Institute, postal code 11727, Nasr City, Cairo, Egypt

3 Zagazig university, Physics Department, Faculty of Science, Zagazig, Egypt

Abstract

In the present study, ZnS and CdS quantum dots (QDs) are attached to mesoporous titanium film by successive ionic layer adsorption and reaction to the synthesized three layers of ZnS and CdS quantum dots (QDs) to form ZnS/TiO2 nanocomposites (NCs), CdS/TiO2, and CdS/ZnS/TiO2 (NCs) as hybrid structures. TiO2 nanoparticles (NPs) are fabricated by the sol-gel method. The synthesized nanomaterials were investigated by XRD, HR-TEM, FTIR, and UV-Visible spectrophotometer. The size of TiO2 NPs was investigated from XRD analysis to be 34.33 nm and was confirmed with HR-TEM. The UV–Vis absorption spectra for samples were recorded. The optical band gap energies (Eg) have been calculated for the deposited films and were found to be 2.39 eV, 2.30 eV, 1.98 eV, and 1.68 eV for TiO2 NPs, ZnS/TiO2, CdS/ TiO2, and/CdS/ZnS/ TiO2 NCs, respectively. And the hybrid quantum dots gives a higher efficiency in quantum dot sensitized solar cells and dye sensitized solar cells.

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