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고효율 고체산화물 연료전지 개발을 위한 자발 착화 연소 합성법과 고상반응법에 의한 $La_ 0.7Sr_0.3MnO_3$ 양극재료 제조 및 물성에 관한 연구
신웅선,박인식,김선재,박성,Shin, Woong-Shun,Park, In-Sik,Kim, Sun-Jae,Park, Sung 한국전기전자재료학회 1997 電氣電子材料學會誌 Vol.10 No.2
L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ powders were prepared by both GNP(Glycine-Nitrate Process) and solid state reaction method in various of calcination temperature(800-1000.deg. C) and time in air. Also, L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ cathode contacts on YSZ(Yttria-Stabilized Zirconia) substrate were prepared by screen printing and sintering method as a function of sintering temperature(1100-1450.deg. C) in air. Sintering behaviors have been investigated by SEM(Scanning Electron Microscope) and porosity measurement. Compositional and structural characterization were carried out by X-ray diffractometer and ICP AES(Inductively Coupled Plasma-Atomic Emission Spectrometry) analysis. Electrical characterization was carried out by the electrical conductivity with linear 4 point probe method. As the calcination period increased in solid state reaction method, L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ phase increased. Although L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ single phase was obtained only for 48hrs at 1000.deg. C, in GNP method it was easy to get single and ultra-fine L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ powders with submicron particle size at 650.deg. C for 30min. The particle size and thickness of L $a_{0.7}$S $r_{0.3}$Mn $O_{3}$ cathode contact by solid state reaction method did not change during the heat treatment, while those by GNP method showed good sintering characteristics because initial powder size fabricated from GNP method is smaller than that fabricated from solid state reaction method. Based on enthalpy change from thermodynamic data and ICP-AES analysis, it was suggested to make cathode contact in composition of (L $a_{0.7}$S $r_{0.3}$)$_{0.91}$ Mn $O_{3}$ which have little second phase (L $a_{2}$Z $r_{2}$ $O_{7}$) for high efficient solid oxide fuel cells applications. As (L $a_{0.7}$S $r_{0.3}$)$_{0.91}$Mn $O_{3}$ cathode contact on YSZ substrate was sintering at 1250.deg. C the temperature that liquid phase sintering did not occur. It was possible to obtain proper cathode contacts with electrical conductivity of 150(S/cm) and porosity content of 30-40%.m) and porosity content of 30-40%.
고효율 태양전지를 위한 p-Type CdTe막의 Cu Doping에 따른 광전기적 특성에 관한 연구
박성,이강렬,신웅선 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
p-type CdTe Films that contained CdCl₂and CuCl₂were prepared by coating and sintering. For the sintered CdTe films that contained 1wt% of CdCl₂befor sintering, the electrical resistivity decreases sharply with increasing sintering temperature, and the resistivity is dependent of the sintering temperature for the sintered CdTe films that contained 1wt%, 6wt% and 11wt% of CdCl₂. This fact conbined with the observed microstructures indicate that the CdCl₂acts as a sintering aid. For the specimens which contained various amounts of CdCl₂befor sintering and were sintered at a high temperature(such as at 700℃), the microstructures are improved and the electrical resistivity increases with the amounts of CdCl₂. Therefore it can be concluded that the CdCl₂acts not only as a sintering aid but also a dopant source of donor (Cl) during the sintering measurement, it can also be concluded that all the grains are depleted of dark conductivity and C-V measurement, it can also be concluded that all the grains are depleted of carrier by the trapping centered at grain boundaries. The electrical resistivity decreases with increasing amounts of CuCl₂up to 250ppm due to Cu-doping sintering.