22-30 July 2021
North-West University
Africa/Johannesburg timezone
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Growth and characterization of CZTS and CZTSSe for solar cell application

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Potchefstroom Campus (North-West University)

Potchefstroom Campus

North-West University

Poster Presentation Track F - Applied Physics Applied Physics


Sibusisiwe Phindile Mzamo (University of Pretoria)


In this study, copper zinc tin sulphide (CZTS) and copper zinc tin sulphur selenide (CZTSSe) thin films were deposited on molybdenum (Mo), indium tin oxide (ITO) and fluorine-doped tin oxide (FTO) by sputtering deposition and were annealed in nitrogen at 500°C for 60 minutes. The XRD patterns on all substrates showed tetragonal kesterite CZTS with I4 ̅ space group and tetragonal kesterite CZTSSe with I4 space group. Raman spectra further confirmed CZTS and CZTSSe. Dominant peaks showing red shifts from 337.2cm-1 for Mo/CZTS to 335.8 and 329.8cm-1 for FTO/CZTS and ITO/CZTS, respectively. Similarly, red shifts were observed for Mo/CZTSSe from 334.3 cm-1 to 331.4 and 322.5 cm-1 for FTO/CZTSSe and ITO/CZTSSe, respectively. The presence of copper tin sulphide (CTS) and zinc sulphide (ZnS) residue on CZTSSe were also revealed by the Raman. UV-Vis analysis depicted the bandgaps of ITO/CZTS, ITO/CZTSSe, FTO/CZTSSe to be 1.26, 1.16 and 1.35 eV, respectively. The sheet resistance, resistivity and conductivity of the thin films was measured using a four point probe. The smallest value resistivity of 2.095 ×〖10〗^(-6)Ω.m was obtained on Mo/CZTSSe while ITO/CZTS had the largest value (115.2 ×〖10〗^(-3)Ω.m). These findings shed light on the structural, optical and electrical properties of ITO/CZTS, ITO/CZTSSe, FTO/CZTS, FTO/CZTSSe as possible bottom layers of tandem solar cells.

Keywords: CZTS, CZTSSe, FTO, ITO, sputtering deposition, solar cell.

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Primary author

Sibusisiwe Phindile Mzamo (University of Pretoria)


Prof. Mmantsae Diale (University of Pretoria) Juvet Nche Fru (University of Pretoria) Dr Dolly Langa (University of Pretoria)

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