Thin-Film FTO-ZnO-CZTS Solar Cells Fully Deposited by Spray Pyrolysis
American Journal of Materials Synthesis and Processing
Volume 4, Issue 1, June 2019, Pages: 1-8
Received: May 26, 2019; Accepted: Jun. 18, 2019; Published: Jun. 27, 2019
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Salif Cisse, Department of Physics, Faculty of Science and Technology, University of Cheikh Anta DIOP, Dakar, Senegal
Maria Covei, Department of Renewable Energy and Recycling Systems, Faculty of Materials Science and Engineering, R&D Institute of the Transilvania, University of Brasov, Brasov, Romania
Jean Jude Domingo, Department of Physics, Faculty of Science and Technology, University of Cheikh Anta DIOP, Dakar, Senegal
Anca Duta, Department of Renewable Energy and Recycling Systems, Faculty of Materials Science and Engineering, R&D Institute of the Transilvania, University of Brasov, Brasov, Romania
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Thin films of ZnO, CZTS (Cu2ZnSnS4) and ZnO-CZTS were prepared by spray pyrolysis deposition (SPD). After spraying a precursor solution of ZnO directly onto fluorine-doped tin oxide (FTO) substrats, CZTS thin layers were sprayed onto layers of ZnO to forme a p-n junction. Some CZTS layers were directly spray onto fluorine-doped tin oxide substrats. ZnO is a wide band gap n-type material, consisting of abundant and nontoxic elements, and is thus expected to be a good substitute for CdS buffer layer in solar cells. In this paper, we report the study of CZTS and ZnO thin films synthesized by chemical spray pyrolysis (CSP) method. During the deposition of the ZnO thin films on the FTO substrats the number of sequences was varied from 20 to 40. The influence of the ZnO on the structural, optical, morphological and electrical properties of CZTS films was studied using various techniques. The X-ray diffraction studies showed the formation of kesterite (Cu2ZnSnS4) phases with the peaks corresponding to (112), (220) and (312) planes. SEM study revealed a lack of uniformity of the surface of the CZTS layers sprayed onto the ZnO layers for a lower thickness of ZnO (FTO-ZnO20-CZTS). The band gap values of FTO-CZTS and FTO-ZnO-CZTS thin films were measured and found in the range 2.2 - 2.25 eV which are in good agreement with the results reported (2-2.2 eV). The morphological studies revealed the formation of some clusters randomly distributed on the film surface in the ZnO-containing layers, i.e. the FTO-ZnO20-CZTS and Finally, current-voltage measurements for different PV cells with maximum efficiency were carried out. A conversion efficiency (η) of 5.99% with fill factor (FF) = 18.8%, open circuit voltage (Voc) = 0.54 V, short circuit current density (Jsc) = 59 mA.cm2 were recorded through the FTO-ZnO40-CZTS thin film PV cell.
Spray Pyrolysis Deposition, Thin Films, Cu2ZnSnS4, Zinc Oxide
To cite this article
Salif Cisse, Maria Covei, Jean Jude Domingo, Anca Duta, Thin-Film FTO-ZnO-CZTS Solar Cells Fully Deposited by Spray Pyrolysis, American Journal of Materials Synthesis and Processing. Vol. 4, No. 1, 2019, pp. 1-8. doi: 10.11648/j.ajmsp.20190401.11
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