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펄스레이저 증착법으로 제작된 $Bi_4Ti_3O_{12}/LaAlO_3$ 박막과 $Bi_4Ti_3O_{12}/YBa_2Cu_3O_{7-x}/LaAlO_3$ 복합구조의 에피 성장
조월렴,조학주,노태원,Jo, Wol-Ryeom,Jo, Hak-Ju,No, Tae-Won 한국결정학회 1994 韓國結晶學會誌 Vol.5 No.2
펄스 레이저 증착법을 이용하여 강유전체 Bi4T13012 박막을 laA109(001) 위에 성장시켰다. 넓은 영역의 온도에서 증착한 박막의 상 형성과 구조적 성질을 X선 회절법을 이용하여 조사하였다. 740℃에서 증착한 박막은 박막의 c-축이 기판에 수직한 형태의 에피 성장의 경향을 보인다. 펄스 레이저 증착법을 이용하여 Bi4Ti3O12/YBa2Cu3O7-x/LaAlO3 복합구조를 in-situ 성장시켰다. Yba2Cu3O7-x의 a-, b-축이 LaAlO3와 완벽하게 평행하게 배열되어 있지 않음에도 불구하고, Bi4Ti3012 박막은 에피 성장의 경향을 보인다. Ferroelectric Bi4Ti3012 thin films have been grown on LaAlO(001) by Pulsed-laser deposition. Phase formation and structural films prepared of the films prepared at varigus deposition temperatures are investigated using x-ray diffraction The film grown at 740℃ shows epitaxial growth behavior with c-akis normal to the substrate. N2tBmstiucCures of Bi4Ti3012/YBa2Cu307-x/LaAIO3(001) have been in-situ grown. Even though the a-and b-axes of the Yba2Cu307-x layer show epitaxial growth behavior.
조월렴,Jo W. The Korean Superconductivity Society 2004 Progress in superconductivity Vol.6 No.1
High-.ate in-situ$ YBa_2$Cu$Cu_3$$O_{7-x}$ (YBCO) film growth was demonstrated by means of the electron beam co-evaporation. Even though our oxygen pressure is low, ∼$5 ${\times}$10^{-5}$ Torr, we can synthesize as-grown superconducting YBCO films at a deposition rate of around 10 nm/s. Relatively high temperatures of around 90$0^{\circ}C$ was necessary in this process so far, and it suggests that this temperature at a given oxygen activity allows a Ba-Cu-O liquid formation along with an YBCO epitaxy. Local critical current density shows a clear correlation with local resistivity. Homogeneous transport properties with a large critical current density ($4 ∼ 5 MA/\textrm{cm}^2$ at 77K, 0T) are observed in top faulted region while it is found that the bottom part carries little supercurrent with a large local resistivity. Therefore, it is possible that thickness dependence of critical current density is closely related with a topological variation of good superconducting paths and/or grains in the film bodies. The information derived from it may be useful in the characterization and optimization of superconducting films for electrical power and other applications.
김주란,김자영,윤석현,양기정,김대환,강진규,조월렴 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Flexible and high-efficient CZTSSe thin-film solar cell were successfully fabricated by a sputtering method. Especially, in order to avoid forming unwanted secondary phases, we varied the condition for thin-film deposition. To figure out the carrier behavior in the materials, we introduced photo-assisted atomic force microscopy (AFM). Photoassisted Kelvin probe force microscopy (KPFM) can measure the current flow induced by the lights, showing them on the thin-film surface. In particular, the surface photovoltage (SPV) has increased with Na passivation, indicating the enhanced carrier lifetime. In this way, we can figure out how the deposition condition can affect the thin films’ structural and optoelectrical properties, thus solar cell performances.