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Kim, Seongtak,Park, Sungeun,Kim, Young Do,Bae, Soohyun,Boo, Hyunpil,Kim, Hyunho,Lee, Kyung Dong,Tark, Sung Ju,Kim, Donghwan American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.10
<P> The effect of peak firing temperature and grid width on the contact properties between Ag metal and silicon (n<SUP>+</SUP> emitter) was investigated for screen-printed silicon solar cells. We confirmed the factors that control the specific contact resistance as follows: (1) the Ag coverage fraction on the silicon surface, d(2) the thickness of the glass layer and (3) the etching depth on the n<SUP>+</SUP> emitter region. The lowest specific contact resistance (8.27 mΩ·cm<SUP>2</SUP>) was obtained at the optimum firing temperature (720 °C). We also found that the grid width affected the contact quality of Ag paste because the contact width related to the absorbed heat of samples in RTP system. For this reason, when the grid width was further reduced, meaning more heat absorption, more Ag crystallites grew and the glass layer thickened. Light I?V results of a 6-inch silicon solar cell with minimum busbar width were similar to the PC1D simulation results. The efficiency was improved by 0.2% with the reduction of the busbar width. </P>
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.
Flue Gas System for an Air-Oxy Dual Firing Power Plant
Sungeun Kim,Hyungjun Ahn,Sangmin Choi,Youngjoo Kim,Taehyung Kim,Sangil Seo 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
Oxy-fuel combustion is considered to be a promising technology in reducing CO₂ emission against global warming. This technology can be applied to retrofitting as well as new constructed utilities. Research group led by KEPRI in Korea have initiated a Youngdong project, which is focused on conceptual design on dual air-oxy firing mode operation in coal fired utilities; 125㎿e air firing and 100㎿e oxy firing is selectively run in the same plant. In this study, flue gas control system is proposed to satisfy its requirement on dual mode operation. Flue gas characteristics of oxy-fuel combustion are also reflected with regard to previous studies. Draft system for dual mode is arranged considering operating conditions. Together with the same draft design, pressure drop on each mode is evaluated throughout the hypothetical system. It is figured out that volume flow rate and required discharging pressure on each air and oxy mode is different. Use of separate fan for each mode is considered as one of alternatives.
Kim, Chongtae,Jeong, Da Eun,Heo, Sungeun,Ji, Eunbyul,Rho, Jun Gi,Jung, Myeongwoo,Ahn, Sojin,Kim, Ye‐,Jin,Kim, Yong‐,Sung,Nam, Suk Woo,Kulkarni, Rohit N,Lee, Kyoung Bun,Lee, Eun Kyung,Kim, Longman 2018 The Journal of pathology Vol.246 No.2
<P><B>Abstract</B></P><P>For the majority of patients diagnosed with pancreatic neuroendocrine tumors (NETs), there is significant malignant potential with a poor prognosis; however, the molecular abnormalities and pathogenesis of pancreatic NETs have not been firmly established. Here, we report that loss of expression of the RNA‐binding protein HuD correlates with low p27<SUP>Kip1</SUP> (p27) levels and poor prognosis in pancreatic NETs. HuD expression was frequently lost in many human pancreatic NETs, and these pancreatic NETs showed aggressive clinicopathological phenotypes with low p27 levels, increased tumor size, higher World Health Organization grade and pT stage of the tumor, and the presence of angioinvasion. Furthermore, loss of HuD was an independent, progression‐free prognostic factor in multivariate survival analysis. However, the level of HuR, a member of the same Hu protein family as HuD, was not significantly correlated with pancreatic NET size and progression. Mechanistically, HuD enhanced <I>p27</I> mRNA translation by interacting with both the 5′‐untranslated region (UTR) and the 3′‐UTR of <I>p27</I> mRNA, and consequently suppressed cell cycle progression and tumor growth. In addition, HuD competed with miR‐30a‐3p for binding to the 3′‐UTR of <I>p27</I> mRNA, suggesting an interplay between HuD and miR‐30a‐3p in controlling <I>p27</I> translation. Our results identify HuD as a pivotal suppressor of pancreatic NET growth, and suggest that HuD has potential value as a prognostic factor of pancreatic NETs. Copyright © 2018 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.</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>
김성탁(Kim, Seongtak),박성은(Park, Sungeun),김영도(Kim, Young Do),송주용(Song, Jooyong),박효민(Park, Hyo Min),김현호(Kim, Hyunho),탁성주(Tark, Sung Ju),김동환(Kim, Donghwan) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
결정질 실리콘 태양전지의 전면 전극은 전극 면적으로 인한 손실(shading loss)를 줄이고 단락전류밀도(Jsc)를 높이기 위해 전극 너비를 줄이는 노력을 하고 있다. 하지만 전극 소성(firing) 시 전면 전극의 핑거(finger)와 버스바(busbar)의 너비 차이로 인해 전극 침투(fire-through) 정도가 달라질 수 있다. 본 연구에서는 전극 소성 공정 시 전면 전극의 너비에 따른 전극 침투 정도를 조사하기 위해 접촉 저항(specific contact resistance)과 재결정화(Ag recrystallite) 된 전면전극의 분포에 대해 비교하였다. 접촉 저항을 측정하기 위하여 transfer length method(TLM)를 이용하였다. 또한 전면 전극층을 제거한 후 실리콘 기판의 재결정 분포를 주사전자현미경(Scanning electron microscope : SEM)을 이용하여 관찰하였다.