Synthesis and surface characterization of electrodeposited quaternary chalcogenide $$\hbox {Cu}_{2}\hbox {Zn}_{x}\hbox {Sn}_{y}\hbox {S}_{1+x+2y}$$ thin film as transparent contact electrode

Autor: Ezekiel Omotoso, O. E. Adewumi, R. A. Busari, A.Y. Fasasi, B. A. Taleatu, Kabir O. Oyedotun, S.A. Adewinbi
Rok vydání: 2020
Předmět:
Zdroj: Bulletin of Materials Science. 43
ISSN: 0973-7669
0250-4707
DOI: 10.1007/s12034-019-2030-y
Popis: A low-cost technique, electrochemical deposition has been used to grow nanocrystalline quaternary Cu–Zn–Sn–S (CZTS) on indium tin oxide (ITO)-coated glass substrate. Effects of variations in deposition potentials and sulphur content on the chemical composition, optical, morphological, structural and electrical properties of the deposited films have been investigated. The morphologies showed and confirmed the results from XRD analysis that the films are of polycrystalline grains. Average interplanar spacing of the films is 3.376 A. The average film’s thickness as estimated from Rutherford back-scattered spectroscopy studies was 34 nm. The estimated stoichiometry was found to be that of $$\hbox {Cu}_{{{2}}}\hbox {ZnSnS}_{{{4}}}$$ tetragonal kesterite structure. Optical studies showed that the absorption characteristic of the deposited CZTS film across the wavelength region is significantly dependent on growth deposition potentials and electrolyte concentration. Estimated band gap is between 1.75 and 1.81 eV. The electrical studies showed that the deposited films exhibit ohmic characteristics. This study demonstrated successful deposition of tetragonal kesterite structures of CZTS using a two-electrode cell approach. It also revealed the novel route of growing CZTS thin film over the conventional three electrode cells.
Databáze: OpenAIRE
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