Abstract
Chest x-ray medical images are widely used for diagnostic purposes for Cu2ZnSnS4 thin films are prepared by sol gel and spin coating methods. In this study, some physical properties such as structural and optical properties of Cu2ZnSnS4 thin films are investigated. Prepared thin films are annealed at 400°C for 1 h under N2 atmosphere. XRD pattern for the peaks 28.31°, 47.26°, and 56.12° which have indexed plans (112), (220) and (312) confirmed that all Cu2ZnSnS4 thin films prepared have kesterite structure. The results of XRD patterns and UV– Visible spectra demonstrated kesterite phase and a great optical absorption coefficient more than 105 cm-1 in visible region. The estimation of the band gap which equal Eg ≈ 1.5 eV by dependent at the optical characteristics.
Highlights
Kesterite Cu2ZnSnS4 (CZTS) has created a significant enthusiasm as a potential absorber material conveying a promising a substitute to CuInxGa1−xSe2 (CIGSe) for thin film solar cells due to the non-toxicity and plenitude of its constituents [1,2]
3.1 STRUCTURAL PROPERTIES Fig. 1(a) show the X-Ray Diffraction (XRD) patterns of the spin coating method Cu2ZnSnS4 thin films comprise of a single phase and have the kesterite structure. the better XRD peaks showed up at 2θ = 28.38°, 47.3°, and 56.03° can be credited to the diffraction of (112), (220), and (312) planes of kesterite stage CZTS thin films, respectively
Cu2ZnSnS4 Nanosheet with kesterite structure can be prepared by Sol-Gel method which synthesized at room temperature using solution method by taking copper, zinc, Tin chloride and Thiourea at molar concentration ratio (Cu: Zn: Sn: S)
Summary
Kesterite Cu2ZnSnS4 (CZTS) has created a significant enthusiasm as a potential absorber material conveying a promising a substitute to CuInxGa1−xSe2 (CIGSe) for thin film solar cells due to the non-toxicity and plenitude of its constituents [1,2]. Thin film solar cells with a CZTS absorber, prepared by the sol-gel method, achieve the photoelectric transformation efficiency of 8% [10]. In 2013, the evaporated CZTS thin film solar cells have exhibit 8.4% conversion efficiency [11] and more recently a most elevated transformation efficiency of 9.2% was reached [12]. The objective of this commitment is the make of high quality CZTS films by spin coating. This technique should bring about the advancement of a basic and slight effort manufacture process of CZTS films
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