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• W2185692114 abstract "n-type Cu 1.0 (In 1.05-x Al x )S 2.1 nanoparticles with various Al contents (x=0.05, 0.10 and 0.20) were synthesized using a novel colloidal method. The method has been adapted and optimized for the introduction of the Al element in the CuInS 2 structure. Energy dispersive X-ray spectroscopy (EDX) analysis of the semiconducting material without Al has shown, as expected, the presence of copper, indium and sulphur. The Cu/In/S atomic ratio is 1.00/1.04/1.85 for the material of nominal composition Cu 1.0 In 1.05 S 2.1 , which is indicative of an n-type material. This data was confirmed by inductively coupled plasma atomic emission spectroscopy (ICP-AES). The X-ray diffraction (XRD) pattern demonstrate that CuInS 2 grows in the desired tetragonal-chalcopyrite phase. The main peaks, identified on the diffractograms of the annealed samples, are assigned to the pure polycrystalline CuInS 2 phase. The XRD patterns of the samples containing Al show that the material crystallinity is enhanced as the Al content is increased, which is of great interest to reduce the electron-hole recombination processes at the semiconductor grain boundaries. The Cu 1.0 (In 0.85 Al 0.2 )S 2.1 particles are semispherical with a diameter of ~20 nm, as examined using a transmission electron microscope (TEM). The material bandgap energy values were obtained from UVvisible spectroscopy measurements carried out on samples in thin film form prepared onto conducting glass substrate (ITO). Analysis of the data indicates that the semiconductor without Al has a direct bandgap energy of 1.5 eV, in agreement with the value reported in the literature for this material. The insertion of aluminum leads to larger bandgap energy values, but the insertion is probably incomplete at these low substitution levels." @default.
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• W2185692114 date "2012-01-01" @default.
• W2185692114 modified "2023-09-27" @default.
• W2185692114 title "Colloidal Synthesis and Characterization of Cu 1.0 (In 1.05-x Al x )S 2.1 Semiconducting Particles" @default.
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