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Rapid and Accurate Measurement of Ideality Factor and Parasitic Resistances of Thin Film Solar Cells
Park, Sungeun,Kim, Soo Min,Park, Se Jin,Bae, Soohyun,Park, Hyomin,Nam, Jung gyu,Lee, Dongho,Yang, Jung Yup,Kim, Dong Seop,Mo, Chanbin,Kim, Young-Su,Kim, Jihyun,Lee, Hae-Seok,Kang, Yoonmook The Electrochemical Society 2018 ECS journal of solid state science and technology Vol.7 No.6
<P>The sunshade method for the measurement of the ideality factor and resistances of solar cells is commonly used in silicon solar cells. However, the method is rarely employed for thin-film solar cells. In this paper, the sunshade method is applied to CIGS solar cells, and it is shown that the three major assumptions of the method remain valid for CIGS solar cells. The extracted parameters are compared to those calculated using other common methods, and the ideality factors and R-s values are quickly determined and found to be nearly the same as those extracted through illuminated I-V fitting and dark I-V fitting. (C) 2018 The Electrochemical Society.</P>
Park, Sungeun,Park, Hyomin,Kim, Dongseop,Yang, JungYup,Lee, Dongho,Kim, Young-Su,Kim, Hyun-Jong,Suh, Dongchul,Min, Byoung Koun,Kim, Kyung Nam,Park, Se Jin,Kim, Donghwan,Lee, Hae-Seok,Nam, Junggyu,Kang Springer-Verlag 2018 METALS AND MATERIALS International Vol.24 No.3
<P>Passivated emitter and rear contact (PERC) is a promising technology owing to high efficiency can be achieved with p-type wafer and their easily applicable to existing lines. In case of using p-type mono wafer, 0.5-1% efficiency increase is expected with PERC technologies compared to existing Al BSF solar cells, while for multi-wafer solar cells it is 0.5-0.8%. We addressed the optimization of PERC solar cells using the Al paste. The paste was prepared from the aluminum-silicon alloy with eutectic composition to avoid the formation of voids that degrade the open-circuit voltage. The glass frit of the paste was changed to improve adhesion. Scanning electron microscopy revealed voids and local back surface field between the aluminum electrode and silicon base. We confirmed the conditions on the SiNx passivation layer for achieving higher efficiency and better adhesion for long-term stability. The cell characteristics were compared across cells containing different pastes. PERC solar cells with the Al/Si eutectic paste exhibited the efficiency of 19.6%.</P>
레이져를 이용한 도핑 특성과 선택적 도핑 에미터 실리콘 태양전지의 제작
박성은(Sungeun Park),박효민(Hyomin Park),남정규(Junggyu Nam),양정엽(JungYup Yang),이동호(Dongho Lee),민병권(Byoung Koun Min),김경남(Kyung Nam Kim),박세진(Se Jin Park),이해석(Hae-Seok Lee),김동환(Donghwan Kim),강윤묵(Yoonmook Kang),김동 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.2
Laser-doped selective emitter process requires dopant source deposition, spin-on-glass, and is able to form selective emitter through SiNx layer by laser irradiation on desired locations. However, after laser doping process, the remaining dopant layer needs to be washed out. Laser-induced melting of pre-deposited impurity doping is a precise selective doping method minimizing addition of process steps. In this study, we introduce a novel scheme for fabricating highly efficient selective emitter solar cell by laser doping. During this process, laser induced damage induces front contact destabilization due to the hindrance of silver nucleation even though laser doping has a potential of commercialization with simple process concept. When the laser induced damage is effectively removed using solution etch back process, the disadvantage of laser doping was effectively removed. The devices fabricated using laser doping scheme power conversion efficiency was significantly improved about 1% abs. after removal the laser damages.
The Art Therapy Experiences of Patients and Their Family Members in Hospice Palliative Care
Park, Sungeun,Song, Hyunjoo Korean Society for Hospice and Palliative Care 2020 한국호스피스.완화의료학회지 Vol.23 No.4
Purpose: In this study, the researchers closely investigated the psychosocial problems faced by terminal cancer patients and their family members in hospice palliative care units. Methods: The investigators conducted four sessions of art therapy intervention programs for the terminal cancer patients and their family members, carried out in-depth interviews about the influence of the cancer experience on their family function and quality of life, and analyzed their experiences using grounded theory methodology. Results: After providing autonomous written informed consent, six pairs of terminally ill cancer patients and their family members, accounting for a total of 17 participants with the inclusion of additional family members who took part sporadically, took part in the art therapy intervention and interviews. The raw data, in the form of verbatim records, were analyzed according to the procedures of grounded theory (open, axial, and selective coding). Through these processes, a total of 154 concepts, 56 subcategories, and 13 categories were identified. Families were classified into four types according to their family function, quality of life, and attitude toward death. Though the art therapy intervention, patients and their family members experienced three stages over time. Conclusion: This research focused on essential aspects of the family relationships and the art therapy experiences of terminal cancer patients and their family members through an art therapy intervention in the context of hospice palliative care. Based on these observations, the researchers constructed a theoretical rationale for art therapy interventions delivered to patients and their family members in the process of hospice palliative care.
Sungeun Park,Hyo Min Park,Yoonmook Kang,Hae-Seok Lee,Donghwan Kim 한국물리학회 2016 Current Applied Physics Vol.16 No.9
The purpose of this work is to investigate a back surface field (BSF) at a number of wafer resistivities for industrial crystalline silicon solar cells. As indicated in this manuscript, doping a crucible-grown Czochralski (Cz)-Si ingot with Ga offers a sure way of eliminating light-induced degradation (LID) because LID is composed of B and O complex. However, the low segregation coefficient of Ga in Si causes a much wider resistivity variation in the Ga-doped Cz-Si ingot. This resistivity variation in a Cz-Si wafer at different locations varies the performance, as is already known. In the light of a B-doped wafer, we made wider resistivity in Si ingot; we investigated how resistivities affect the solar cell performance as a function of BSF quality.
Effect of sorbitol doping in PEDOT:PSS on the electrical performance of organic photovoltaic devices
Sungeun Park,탁성주,김동환 한국물리학회 2011 Current Applied Physics Vol.11 No.6
Organic photovoltaic cells have important advantages, such as low cost and mechanical flexibility. The conducting polymer poly(3,4 ethylenedioxy-thiophene):poly(styrene sulfonate) (PEDOT:PSS) has been widely used as an interfacial layer or a polymer electrode in polymer electronic devices, such as photovoltaic devices and light-emitting diodes. In this report, we discuss the direct current (DC)conductivity of PEDOT:PSS films containing various weight ratios of sorbitol dopant. The work function is shown to steadily decrease with increasing dopant content. With different dopant contents, illuminated current―voltage photovoltaic characteristics were observed. Ultraviolet photoelectron spectroscopy (UPS) analysis revealed that the work function of the PEDOT:PSS was affected by its sorbitol content. The morphologies of the doped PEDOT:PSS films were characterized by atomic force microscopy (AFM). For the device fabrication, we made organic photovoltaic cells by a spin-coating process and Al deposition by thermal evaporation. The sorbitol dopant is able to improve the efficiency of the device.
Effects of Rapid Thermal Process on the Junction Properties of Aluminum Rear Emitter Solar Cells
Sungeun Park,Young Do Kim,Soohyun Bae,Seongtak Kim,Jooyong Song,Hyunho Kim,Hyo Min Park,Soomin Kim,탁성주,김동환 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.4
N-type silicon with aluminum emitters for rear junctions was studied; aluminum back surface fields were replaced with n-type silicon wafers. Aluminum rear emitters for n-type silicon solar cells were studied with various rapid thermal processing conditions. With fast ramping-up and fast cooling, an aluminum rear junction was formed uniformly with low emitter recombination current. The effects of junction quality on solar cell efficiency were investigated.
Park, C. Hyung Keun,Lee, Jae Won,Lee, Sang Yeol,Shim, Se-Hoon,Moon, Jung-Joon,Paik, Jong-Woo,Cho, Seong-Jin,Kim, Shin Gyeom,Kim, Min-Hyuk,Kim, Seokho,Park, Jae-Hyun,You, Sungeun,Jeon, Hong Jin,Ahn, Yo Wolters Kluwer Health, Inc. All rights reserved. 2018 Journal of nervous and mental disease Vol.206 No.11
ABSTRACT: There is a paucity of research characterizing suicide-related factors in victims of early trauma (ET). This cross-sectional study investigated an increase in trait impulsivity of ET victims with suicidal ideation or behavior and its role in severity of psychopathologies and experienced stress. Using data of 401 Korean suicidal ideators and attempters, trait impulsivity, severity of psychopathologies, and stress levels in addition to sociodemographic and clinical characteristics were compared between the ET group and the no ET group. Three first-order factors of trait impulsivity measured in Barratt Impulsive Scale-11 (cognitive instability, motor, and [lack of] perseverance) as well as depression, anxiety, overall stress level, and stress from social relationships were significantly elevated in the ET group. Owing to the long-lasting neurobiological influences of ET, it is recommended clinically that victims be carefully monitored for the development of mental distress, such as depression and anxiety, even in adulthood.