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Cu(In,Ga)Se<sub>2</sub> 박막의 저온 성장 및 NaF 후속처리를 통한 태양전지 셀 특성 연구
김승태,정광선,윤재호,박병국,안병태,Kim, Seung Tae,Jung, Gwang Seon,Yun, Jae Ho,Park, Byong Guk,Ahn, Byung Tae 한국태양광발전학회 2015 Current Photovoltaic Research Vol.3 No.1
High efficiency $Cu(In,Ga)Se_2$ solar cells are generally prepared above $500^{\circ}C$. Lowering the process temperature can allow wider selection of substrate material and process window. In this paper, the three-stage co-evaporation process widely used to grow CIGS thin film at high temperature was modified to reduce the maximum substrate temperature. Below $400^{\circ}C$ the CIGS films show poor crystal growth and lower solar cell performance, in spite of external Na doping by NaF. As a new approach, Cu source instead of Cu with Se in the second stage was applied on the $(In,Ga)_2Se_3$ precursor at $400^{\circ}C$ and achieved a better crystal growth. The distribution of Ga in the films produce by new method were investigated and solar cells were fabricated using these films.
Cu(In,Ga)Se₂ 박막의 저온 성장 및 NaF 후속처리를 통한 태양전지 셀 특성 연구
김승태(Seung Tae Kim),정광선(Gwang Seon Jung),윤재호(Jae Ho Yun),박병국(Byong Guk Park),안병태(Byung Tae Ahn) 한국태양광발전학회 2015 Current Photovoltaic Research Vol.3 No.1
High efficiency Cu(In,Ga)Se₂ solar cells are generally prepared above 500°C. Lowering the process temperature can allow wider selection of substrate material and process window. In this paper, the three-stage co-evaporation process widely used to grow CIGS thin film at high temperature was modified to reduce the maximum substrate temperature. Below 400°C the CIGS films show poor crystal growth and lower solar cell performance, in spite of external Na doping by NaF. As a new approach, Cu source instead of Cu with Se in the second stage was applied on the (In,Ga)₂Se₃ precursor at 400°C and achieved a better crystal growth. The distribution of Ga in the films produce by new method were investigated and solar cells were fabricated using these films.
비자성/강자성 이중층에서 스핀 궤도 돌림힘의 전기적 측정방법 고찰
이수길(Soogil Lee),류정춘(Jeongchun Ryu),최종국(Jong-Guk Choi),김정목(Jeong-Mok Kim),이재욱(Jae Wook Lee),박준영(June-Young Park),강재민(Jaimin Kang),박병국(Byong-Guk Park) 한국자기학회 2019 韓國磁氣學會誌 Vol.29 No.3
Spin-orbit torque (SOT) is a spin torque based on spin-orbit coupling in a nonmagnet/ferromagnet heterostructure. In this structure, transverse spin current that is generated by an in-plane charge current and exerts torque on the adjacent ferromagnetic layer. This is intensively investigated because it can be used to switch the ferromagnet effectively in various spintronic devices. Here, we discuss various experimental methods to evaluate the SOT in nonmagnet/ferromagnet bilayer structures.
고산(San Ko),이근희(Geun-Hee Lee),김갑진(Kab-Jin Kim),박병국(Byong-Guk Park) 한국자기학회 2021 韓國磁氣學會誌 Vol.31 No.5
We propose a universal spintronic logic device based on the current-induced magnetic domain wall (DW) motion. The majority gating operation is demonstrated by micromagnetic simulation using spin-orbit torque (SOT)-driven DW motion in Hall bar structures with perpendicular magnetic anisotropy. The logic gates including AND, OR, NAND, NOR are demonstrated, indicating the universality of DW majority gate. The simulation is partially confirmed by experiment, in which we found that the asymmetry in DW motion induced by Dzyaloshinskii-Moriya interaction or local Oersted field can cause the device malfunction. Our result suggests that the DW motion can be used not only in memory device but also in logic device, which could be useful in future processing-in-memory computing technology.
탄소가 도핑 된 FePt 박막에서의 펨토 초 펄스 레이저에 의한 자기 소거와 회복 분석
송현석(Hyon-Seok Song),고현석(Hyun Seok Ko),홍정일(Jung-Il Hong),신성철(Sung-Chul Shin),이경동(Kyeong-Dong Lee),박병국(Byong-Guk Park) 한국자기학회 2015 韓國磁氣學會誌 Vol.25 No.2
After preparing carbon-doped FePt films by dc magnetron sputtering, we observed ultrafast demagnetization and its recovery by means of a time-resolved magneto-optical Kerr effect technique. We confirm that the degree of L10 ordering is decreased and coercivity is changed, as the carbon concentration increases. All samples are demagnetized within ~5 ps after the femtosecond laser pulse heated the sample. Interestingly, ultrafast relaxation time, which indicates fast magnetization recovery, increases as the carbon concentration increases due to the low spin-orbit coupling of carbon.