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- 저자 : Insol Jo (검색결과 2 건)
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Self-assembly of CdTe Nanowires for Solar Cells Under a 550 nm Wavelength Light
Jo Insol,Kim Jae-Moon,Kang Jeong Won,Kim Ki-Sub 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.2
The incorporation of cadmium telluride (CdTe) nanowire photovoltaics off ers the possibility to overcome energy loss in solar cells associated with minority carrier recombination, and to increase optical effi ciency by reducing refl ection. In this study, CdTe nanowires (NWs) were synthesized from individual nanoparticles encapsulated with thioglycolic acid (TGA) and 1-thioglycerol (TGC) via self-assembly under illumination by a 550 nm wavelength light. This wavelength resulted in the self-assembly of nanoparticles into nanowires. TGA-stabilized CdTe NWs (TGA-NWs) and TGC-stabilized CdTe NWs (TGC-NWs) that made up the self-assembly were diff erent crystalline structures. Most of the produced nanowires were straight and varied in length from 1.2 to 3.9 μm. The oxidation of Te 2− in CdTe nanoparticles under a 550 nm wavelength light resulted in the assembly of nanowires consisting of several layers of individual nanoparticles. Transmission electron microscopy was performed to characterize the synthesized nanostructures. Photoluminescence analysis showed that the wavelength of the nanostructures was slightly blue-shifted.
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Jaewan Im,Sanghun Lee,Insol Jo,Jeong Won Kang,Jeong Won Kang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
This study investigated the use of ionic liquids such as 1-butyl-3-methylimidazolium chloride, 4-butyl-4-methyl morpholinium chloride, 1-butyl-1-methylpiperidinium chloride, and 1,3-dimethylimidazoliummethylphosphite to dissolve cellulose, hemicellulose, and lignin biomass, as alternatives to highly toxicorganic solvents. The biomass treated with the ionic liquids is characterized by scanning electron microscopy,X-ray diffraction, thermogravimetric analysis, and Fourier-transform infrared spectroscopy. The Xraydiffraction results revealed that most of the biomass treated with ionic liquids had low crystallinityafter treatment with the ionic liquids. Thermogravimetric analysis confirmed that the pyrolysis temperatureof the biomass treated with the ionic liquid decreased. However, it was found that the pyrolysistemperature of the biomass was increased again after the ionic liquid was washed with an antisolvent. This result was interpreted using Fourier-transform infrared spectroscopy to show that the O–H hydrogenbonding of cellulose was restored. The experimental results from this study can help provide a betterunderstanding of the biomass regeneration mechanism of ionic liquids and increase the applicability ofbiomass in various fields.
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