<abstract xmlns="http://www.w3.org/1999/xhtml"><p> High-quality CdS nanocrystalline thin films were grown by sol-gel spin coating method at different solution temperatures on glass substrates. As-deposited films exhibited nanocrystalline phase with hexagonal wurtzite structure and showed good adhesion and smooth surface morphology. It was clearly observed that the crystallinity of the thin films improved with the increase in solution temperature. Crystallites sizes of the films also increased and were found to be in the range of 10 mm to 17 nm. The influence of the growth mechanism on the band and sub-band gap absorption of the films was investigated using UV-Vis and photothermal deflection spectroscopy (PDS). The band gap values were calculated in the range of 2.52 eV to 2.75 eV. The band gap decreased up to 9 % with the increase in solution temperature from 45 °C to 75 °C. Absorption coefficients estimated by PDS signal showed the significant absorption in low photon energy region of 1.5 eV to 2.0 eV. The dark and illuminated I-V characteristics revealed that the films were highly photosensitive. The results demonstrated the potential applications of sol-gel grown CdS nanocrystalline thin films as photoconductors and optical switches.</p></abstract>

High-quality CdS nanocrystalline thin films were grown by sol-gel spin coating method at different solution temperatures on glass substrates. As-deposited films exhibited nanocrystalline phase with hexagonal wurtzite structure and showed good adhesion and smooth surface morphology. It was clearly observed that the crystallinity of the thin films improved with the increase in solution temperature. Crystallites sizes of the films also increased and were found to be in the range of 10 mm to 17 nm. The influence of the growth mechanism on the band and sub-band gap absorption of the films was investigated using UV-Vis and photothermal deflection spectroscopy (PDS). The band gap values were calculated in the range of 2.52 eV to 2.75 eV. The band gap decreased up to 9 % with the increase in solution temperature from 45 °C to 75 °C. Absorption coefficients estimated by PDS signal showed the significant absorption in low photon energy region of 1.5 eV to 2.0 eV. The dark and illuminated I-V characteristics revealed that the films were highly photosensitive. The results demonstrated the potential applications of sol-gel grown CdS nanocrystalline thin films as photoconductors and optical switches.

Sol-Gel Derived Cds Nanocrystalline Thin Films: Optical and Photoconduction Properties

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

High-quality CdS nanocrystalline thin films were grown by sol-gel spin coating method at different solution temperatures on glass substrates. As-deposited...

Sol-Gel Derived Cds Nanocrystalline Thin Films: Optical and Photoconduction Properties

Published Online: Jun 25, 2018

Page range: 235 - 241

Received: Feb 26, 2017

Accepted: Feb 19, 2018

DOI: https://doi.org/10.1515/msp-2018-0028

Keywords
CdS, sol-gel, optical properties, photothermal deflection spectroscopy, photoconductivity

© 2018 Ziaul Raza Khan et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Sol-Gel Derived Cds Nanocrystalline Thin Films: Optical and Photoconduction Properties

Published Online: Jun 25, 2018

Page range: 235 - 241

Received: Feb 26, 2017

Accepted: Feb 19, 2018

DOI: https://doi.org/10.1515/msp-2018-0028

KeywordsCdS, sol-gel, optical properties, photothermal deflection spectroscopy, photoconductivity

© 2018 Ziaul Raza Khan et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
CdS, sol-gel, optical properties, photothermal deflection spectroscopy, photoconductivity