Structural, optical properties of spin-coated CIG/SLG, CIGS/SLG, CIGS/Mo/SLG thin films

ABSTRACT

This report demonstrates non-toxic synthesis of CIG (CuInGa) colloidal solution and their three and five times spin coating on SLG (Soda lime glass). The spin-coated unselenised (CIG/SLG) and selenised (CIGS/SLG) thin films thickness profile, UV–visible optical property and CIG/SLG, CIGS/SLG, CIGS/Mo/SLG thin films surface morphologies and EDS patterns are discussed in detail. Raman spectrums are also interpreted for the CIGS/SLG, CIGS/Mo/SLG thin films. It has found thickness (2.5–3.0 μm) of the CIG/SLG thin films is influenced from increasing number of spin coating times. An apparent enhancement in optical energy band gaps for the unselenised and selenised thin films has observed. A soupier grain growth has appeared for the selenised thin films. While EDS result demonstrates the elemental presence in these thin films compositions. A broad Raman peak for the CIGS/SLG thin films has observed at 173 cm⁻¹, while CIGS/Mo/SLG at 173 and 242 cm⁻¹.

KEYWORDS:

• CIGS
• thin films
• structural properties
• optical properties

Acknowledgements

The author is thankful to University of Johannesburg, Department of Mechanical Engineering Science (APK), Faculty of Engineering and the Built Environment (FEBE), for the support under the PDRF program. We would also like to thank Ms. Annie Jen for her contribution of this paper.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

Prof T Jen would like to acknowledge the support from NRF and URC funding from University of Johannesburg.