Abstract

GORDILLO, Gerardo; CALDERON, Clara  and  MORENO, Robinson. Fabrication of solar cells based on Cu₂ZnSnS₄ films grown with optimized chemical composition homogeneity. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2019, vol.43, n.166, pp.17-23. ISSN 0370-3908.  https://doi.org/10.18257/raccefyn.783.

Solar cells with Mo/CZTS/ZnS/ZnO structure were fabricated using Cu2ZnSnS4 (CZTS) films as the absorber layer. These films were grown by simultaneous evaporation of its precursors with a coaxial evaporation source whose advanced design allowed to improve significantly the homogeneity of the chemical composition in the entire volume. Through X-ray diffraction (XRD) measurements we were able to verify that under optimized growing conditions, it is possible to get single phase Cu2ZnSnS4 films; through X-ray photoelectron spectroscopy (XPS) depth profile analysis we confirmed that the chemical composition of the samples prepared from a coaxial source had a better homogeneity throughout the volume than the samples deposited from three separated evaporation sources. We also found that the conversion efficiencies of solar cells fabricated using a CZTS absorber layer grown from a coaxial evaporation source was significantly greater than that of cells fabricated using CZTS layers prepared from separate evaporation sources. We obtained conversion efficiencies of 5.6%, short circuit current of 18.3 mA/ cm2 and open-circuit voltage of 0.52 V. © 2019. Acad. Colomb. Cienc. Ex. Fis. Nat.

Keywords : Cu₂ZnSnS₄ thin films; Solar cells; Co-evaporation; XRD; XPS analysis.

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