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Yeonwon Kim 한국표면공학회 2015 한국표면공학회지 Vol.48 No.3
A high-pressure depletion method using plasma chemical vapor deposition (CVD) is often used to deposit hydrogenated microcrystalline silicon (μc-Si:H) films of a low defect density at a high deposition rate. To understand proper deposition conditions of μc-Si:H films for a high-pressure depletion method, Si films were deposited in a combinatorial way using a multi-hollow discharge plasma CVD method. In this paper the substrate temperature dependence of μc-Si:H film properties are demonstrated. The higher substrate temperature brings about the higher deposition rate, and the process window of device quality μc-Si:H films becomes wider until 200℃. This is attributed to competitive reactions between Si etching by H atoms and Si deposition.
Yeonwon Kim,Kazunori Koga,Masaharu Shiratani 한국물리학회 2020 Current Applied Physics Vol.20 No.1
We investigated the effect of hydrogen dilution on the Si cluster volume fraction of hydrogenated amorphous films by varying the hydrogen dilution ratio at 0.5 Torr and compared it to that obtained at pure silane discharge at 0.3, 0.4, and 0.5 Torr. The correlation between the plasma emission characteristic, deposition rate, and cluster volume fraction in the hydrogen dilution plasma was described. The cluster volume fractions of films under hydrogen dilution conditions were similar to those of the pure silane but showed a higher deposition rate. The results suggest that under hydrogen dilution conditions, it is possible to maintain a higher deposition rate with a lower cluster incorporation rate.
Kim Yeonwon,Yang Jeonghyeon 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.78 No.1
In this study, electrospun polyvinylidene fluoride (PVDF) nanofibers containing filler materials composed of copper oxide and calcium carbonate with different contents were prepared to enhance the electroactive β phase content in the PVDF matrix. The fillers were synthesized using the plasma–liquid electrochemical synthesis method, where copper, a tungsten electrode, and seawater were used as the anode, cathode, and electrolyte, respectively. The atmospheric plasma was generated by applying a high voltage between the electrolyte surface and the tungsten electrode 1 mm above. The electrochemical reactions for particle synthesis were promoted by plasma irradiation, with the charged particles entering the electrolyte. The PVDF solution for the electrospun nanofiber was mixed with the synthesized particles that were a mixture of copper oxide with a dominant fraction of calcium carbonate, as determined using the X-ray diffraction patterns. The structural and the electrical properties of the as-prepared electrospun nanofibers were characterized using microscopy, spectroscopy, and electrical testing. Small loadings of the synthesized particles into in the PVDF matrix induced clear changes in terms of crystallization, morphology, and electrical properties of the prepared materials.
Study on the Elicitation of Parameter in Designing each Capacity of PV System for Power Industry
김병만(Kim, ByeongMan),이길송(Lee, KilSong),양연원(Yang, YeonWon),신현우(Shin, HyunWoo),김의환(Kim, EuiHwan) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Recently, as much supplied with new-renewable energy, as much invested in PV system. PV system consists of PV module, PCS and Monitering system, and also could be classified into the type and the capacity by installation method and cost etc. When various systems are installed in the field, it is needed to research for applying in the field and establish infrastructure in order to ensure stable efficiency and reliability. In this study, as the basic design of the demonstration test facility, it is designed the basic PV systems for each capacity to test each PCS. In addition, It is drew the climatic conditions such as insolation, temperature and the design parameters such as installation angle, shades for the local demonstration project and expected the generation of each PV system.