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RISS 인기검색어
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- 저자 : GURAV KISHOR VISHWANATH (검색결과 2 건)
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신승욱,In-YoungKim,GURAV KISHOR VISHWANATH,Chae Hwan Jeong,Jae Ho Yun,P.S. Patil,이정용,Jin Hyeok Kim 한국물리학회 2013 Current Applied Physics Vol.13 No.8
Cu2ZnSn(SxS1-x)4 (CZTSSe) thin films were prepared by annealing a stacked precursor prepared on Mo coated glass substrates by the sputtering technique. The stacked precursor thin films were prepared from Cu, SnS2, and ZnS targets at room temperature with stacking orders of Cu/SnS2/ZnS. The stacked precursor thin films were annealed using a tubular two zone furnace system under a mixed N2 (95%) þ H2S (5%) þ Se vaporization atmosphere at 580 ℃ for 2 h. The effects of different Se vaporization temperature from 250 C to 500 ℃ on the structural, morphological, chemical, and optical properties of the CZTSSe thin films were investigated. X-ray diffraction patterns, Raman spectroscopy, and X-ray photoelectron spectroscopy results showed that the annealed thin films had a single kesterite crystal structure without a secondary phase. The 2q angle position for the peaks from the (112) plane in the annealed thin films decreased with increasing Se vaporization temperature. Energy dispersive X-ray results showed that the presence of Se in annealed thin films increased from 0 at% to 42.7 at% with increasing Se vaporization temperatures. UVeVIS spectroscopy results showed that the absorption coefficient of all the annealed thin films was over 104 cm-1 and that the optical band gap energy decreased from 1.5 eV to 1.05 eV with increasing Se vaporization temperature.
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Sandip Sabale,Arti Bandgar,Haiyan Wang,GURAV KISHOR VISHWANATH,김진혁,S. H. Pawar 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.3
Phase pure anatase nanospherical TiO2 has been obtained by sol dissolution method using TiCl3 as a precursor. The effect of annealing temperature on the properties of TiO2 has been studied and discussed. The structural, morphological and optical properties of the synthesized powder were determined using XRD, SEM, AFM, TEM, UV-Visible and flourimetry. The anatase phase of synthesized TiO2 using this method has a higher thermal stability up to 800 °C after which it is transformed into rutile phase. The crystallite size increases with the annealing temperature. The shift in absorption towards the visible region is observed for the anatase phase. The material showed fluorescence properties emitting light of 410 nm. The study also evaluated the photodegradation of a congo red as model dye. The TiO2 powder has shown good catalytic properties due to its high surface area. The proposed method is simple, fast, and efficient and reproducible for the synthesis of homogeneous nanospheres of TiO2, which will be applicable in possible optoelectronic devices.
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