期刊
SUPERLATTICES AND MICROSTRUCTURES
卷 124, 期 -, 页码 17-29出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.spmi.2018.09.033
关键词
Cu2FeSnS4 thin film; Spray pyrolysis; Thiourea concentration; Physical properties; Photocatalysts
Quaternary chalcogenide Cu2FeSnS4 (CFTS) thin films were successfully elaborated by spray pyrolysis technique on glass substrates using different thiourea concentrations (4, 5, 6 and 7.10(-2)M) as sulfur source. The chemical composition, morphological, structural, optical and electrical properties were investigated using respectively dispersive X-ray spectrometry (EDX), scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, spectrophotometer and Hall Effect measurements. XRD and Raman spectroscopy revealed that CFTS thin films synthesized at thiourea concentration [S] = 6.10(-2)M grows with a pure and good crystalline quality. CFTS thin layer crystallized into the stannite structure with the preferred orientation (112) plan. The average grain size reaches a maximum value about 41 nm at [S] = 6.10(-2)M. The obtained CFTS stoichiometric ratio was Cu:Fe:Sn:S = 2,25/1/0,91/4,08 which is close to the theoretical ratio 2:1:1:4. Optical properties present a high absorption coefficient value equal to 8 10(4) cm(-1), with an estimated band gap value 1,05 eV. This work demonstrates also that electrical resistivity was about 0,46 52 cm at room temperature and has been decreased to a minimum value of 0,014 at 80 degrees C. All these experimental results make sprayed CFTS thin film synthesized at [S] = 6.10(-2) M as a promising absorber layers in solar devices. Methylene Blue dye under sun illumination has been used to test to photocatalytic activity of optimum CFTS thin film. A value of photo-degradation near 76% of MB dye has been obtained for 4 h duration. This result show that CFTS thin film synthesized at [S] = 6.10(-2) M is a good candidate for photocatalysis applications.
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