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Lee, Jaehyeong,Choi, Wonseok,Lee, Kyuil,Lee, Daedong,Kang, Hyunil American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>HIT (Heterojunction with Intrinsic Thin-layer) photovoltaic cells is one of the highest efficiencies in the commercial solar cells. The pyramid texturization for reducing surface reflectance of HIT solar cells silicon wafers is widely used. For the low leakage current and high shunt of solar cells, the intrinsic amorphous silicon (a-Si:H) on substrate must be uniformly thick of pyramid structure. However, it is difficult to control the thickness in the traditional pyramid texturing process. Thus, we textured the intrinsic a-Si: H thin films with the round pyramidal structure by using HNO3, HF, and CH3COOH solution. The characteristics of round pyramid a-Si: H solar cells deposited at pressure of 500, 1000, 1500, and 2000 mTorr by PECVD (Plasma Enhanced Chemical Vapor Deposition) was investigated. The lifetime, open circuit voltage, fill factor and efficiency of a-Si: H solar cells were investigated with respect to various deposition pressure.</P>
Lee, Jaehyeong,Choi, Byung Hui,Yun, Jung-Hyun,Park, Yong Seob American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>Synthetic diamond-like carbon (DLC) is a carbon-based material used mainly in cutting tool coatings and as an abrasive material. The market for DLC has expanded into electronics, optics, and acoustics because of its distinct electrical and optical properties. In this work, n-doped DLC (N:DLC) films were deposited on p-type silicon substrates using an unbalanced magnetron sputtering (UBMS) method. We investigated the effect of the working pressure on the microstructure and electrical properties of n-doped DLC films. The structural properties of N: DLC films were investigated by Raman spectroscopy and SEM-EDX, and the electrical properties of films were investigated by observing the changes in the resistivity and current-voltage (I-V) properties. The N: DLC films prepared by UBMS in this study demonstrated good conducting and physical properties with n-doping.</P>
Lee, Jaehyeong,Kim, Nam-Hoon,Park, Yong Seob American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>Antimony-doped tin oxide (ATO) films were deposited on polyethersulfone (PES) substrates by means of a radio frequency (RF) magnetron sputtering method, using a SnO2 target mixed with 6 wt% Sb at room temperature and using various RF powers; these films were used as transparent electrodes in inverted organic solar cells (IOSC). We investigated the structural, optical, and electrical properties of the resulting films by means of various analyses, including X-ray diffraction (XRD), UV-visible spectroscopy, and Hall effect measurements. The crystallinity and conductivity of the ATO films were increased by increasing the RF power used. Based on the experimental data acquired, we fabricated IOSCs based on ATO electrodes deposited by using various conditions. Each IOSC device was composed of an ATO electrode, a ZnO buffer layer, a photoactive layer (P3HT:PCBM), and an Al cathode. The IOSC based on an ATO electrode fabricated at the RF power of 160 W exhibited good device performance due to the electrode's high conductivity and crystallinity.</P>
Performance Analysis of Floating Photovoltaic Systems on the Water Surface
Lee, Sung Hun,Choi, Young Kwan,Hwang, Soohyun,Lee, Jaehyeong American Scientific Publishers 2018 Science Of Advanced Materials Vol.10 No.4
<P>This paper introduced the results for 3-years study period, focusing on two floating photovoltaic test systems with capacities of 2.4 kW and 100 kW. These two systems were installed at two reservoirs in Korea's southern provinces. The results indicated a 10% increase in power generation due to the cooling effect on the PV modules resulting from the low temperature of the water surface. In addition, a mooring method was developed to ensure that the buoyancy body can adapt to large changes in the water level in the dam reservoirs while maintaining the direction of the body. Furthermore, the effects of applying water-proof systems and the challenges yet to be resolved are also described in this research.</P>
Role of the buffer solution in the chemical deposition of CdS films for CIGS solar cell applications
Lee, Sooho,Kim, Donguk,Baek, Dohyun,Hong, Byoungyou,Yi, Junsin,Lee, Jaehyeong,Park, Yong Seob,Choi, Wonseok Korean Physical Society 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.10
In this work, the effects of NH4Ac on the structural and the electro-optical properties of CdS films were investigated. CdS thin films were deposited on soda-lime glass and indium-tin-oxide (ITO) coated glass from a chemical bath containing 0.025 M cadmium acetate, 0 M similar to 0.2 M ammonium acetate, 0.5 M thiourea, and ammonia. Cadmium acetate was the cadmium source, ammonium acetate served as a buffer, ammonia was the complexing agent, and thiourea was the source of sulfur. A commonl- available chemical bath deposition system was successfully modified to obtain precise control over the pH of the solution at 75 A degrees C during the deposition. Chemically deposited CdS films were studied by using field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), optical transmittance, and electrical resistivity measurements.
Lee Junghun,Lee Dongyeong,Lee Jaehyeong,Yoon Minhan,Jang Gilsoo 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
In this study, we analyzed the impact of multi-terminal direct current (MTDC) system on the integration of renewable energy resources into the Korean power system. Due to the large-scale renewable energy plants planned to be integrated into the power system, line congestion is expected in the southern part of power system. Given the difficulty in constructing AC transmission lines due to social conflicts, we proposed an alternative solution using an offshore multi-terminal DC offshore transmission system. Firstly, we calculate the effective renewable energy plant generation capacity based on annual wind and solar radiation data. Next, we conduct PSS/E simulations to minimize future line congestion in the Korean power grid. The offshore terminal is designed to transfer the power generated in southern Korea and is verified using different terminal rating cases. The simulation result, including contingency analysis, demonstrate that transferring 80% of the generated renewable power achieves the best line flow condition. Therefore, the MTDC system is a possible candidate for integrating future renewable energy systems into the Korean power grid.