研究目的
To study the effect of the changes in cooper concentration on its structural, morphological, compositional, and optical properties of the Cu2Zn0.8Cd0.2SnS4 pentrary alloy nanostructures using Sol gel –spin coating method.
研究成果
Spin coating proves capability to précised nanostructures of Cu2Zn0.8Cd0.2SnS4. The direct optical band gap of the nanostructures is found to decrease linearly from 1.80 eV to 1.60 eV with increasing of Cu contents. Transmittance decreases with increasing concentration of Cu that given the preference for absorber layer fabrication.
研究不足
The study focuses on the effect of copper concentration on the optical properties of Cu2Zn0.8Cd0.2SnS4 pentrary alloy nanostructures, but does not explore other potential variables or the scalability of the method for industrial applications.
The Cu2Zn0.8Cd0.2SnS4 pentrary alloy nanostructures were deposited on the glass substrates by the sol-gel spin coating methods. The solution of the Cu2Zn0.8Cd0.2SnS4 precursors were prepared from different molarity copper (II) chloride monohydrate 0.3, 0.5, 0.7. and 0.9 M and zinc (II) acetate dehydrate (0.3M), tin (II) chloride dehydrate (0.3), cadmium (II) chloride (0.3M), thiourea (0.3M), 2-methoxyethanol (2-metho), and monoethanolamine (MEA). The 2-metho and MEA were used as the solvent and the stabilizer, respectively. The solution was stirred at 50 0C to completely dissolve the metal compounds, during stirring the milk solution became a yellow. After that, the solution was dropped onto the glass substrate that was rotating at 2500rpm for 30s. After deposition by spin coating, the films were dried at 250 °C for 80min on a hot plate. The coating and drying processes were repeated for seven times to obtain 1~ μm thick films. All samples were annealed at 300 °C under N2 atmosphere for 1 hour. Optical properties measured at room temperature using an UV-visible (UV-vis) spectrophotometer model (Perkin Elmer Lambda 950).
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