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Fabrication and Characterization of Monocrystalline-like Silicon Solar Cells
한규민,이희덕,조준식,박상현,윤재호,윤경훈,유진수 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.8
Due to the necessity of association the high purity levels of monocrystalline silicon and the lower cost of multicrystalline silicon wafers, the monocrystalline-like silicon technique is used as a promising material for solar cells fabrication. The grain orientation of this material is composed of both <111> and <100>. As a result of the combination for properties on the basis of two type materials, silicon surface texturing was carried out by Alkaline (NaOH) chemical and Reactive ion etching (RIE) texturing. In this paper, we have investigated the optical and electrical properties for silicon surface morphology by the different texturing process. By the Alkaline and RIE texturing process, a fill factor of 78.6% has been obtained with a conversion efficiency of 17.2% in a monocrystalline-like silicon wafer of an active surface area of 243 cm<SUP>2</SUP>. Compared to Alkaline texturing, the conversion efficiency of this result has showed an increase of 0.5%. It is, therefore, possible to fabricate the Large-area monocrystalline-like silicon solar cell of high efficiency and low cost.
선택적 에미터 결정질 실리콘 태양전지 제작을 위한 할로겐 램프 장치 개발
한규민,최성진,이희덕,송희은 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.5
Halogen lamp was applied to fabricate the selective emitter crystalline silicon solar cell. In selective emitter structure, the recombination of minority carriers is reduced with heavily doped emitter under metal grid, consequently improving the conversion efficiency. Laser selective emitter process which is recently used the most generally induces the damage on the silicon surface. However the lamp has enough heat to form heavily doped emitter layer by diffusing phosphorus from PSG without surface damage. In this work, we have studied to find the design and the suitable condition for halogen lamp such as power, time, temperature and figured out the possibility to fabricate the selective emitter silicon solar cell by lamp heating. The sheet resistance with 100Ω/□ was lower to 50Ω/□ after halogen lamp treatment. Heat transfer to lightly doped emitter region was blocked by using the shadow mask.
Vapor-textured EFG Silicon Photovoltaic Cells
한규민,이준신,조준식,유진수 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.5
EFG (edge-defined film-fed growth) solar cell fabrication is still an important process because of its cost effectiveness compared with crystalline silicon (c-Si). In our work, a new technique called vapor texturing was used to achieve effective texturing of EFG-Si. Texturing using an acidic solution was performed on p-type EFG-Si wafers with resistivity 0.5–2 Ω·cm and thickness 300 ㎛ using HF:HNO_3:CH_3COOH:DI water in the volume ratio 8:21:10:8 for 3 min. An etching depth of about 4 ㎛ was achieved on both sides of EFG-Si wafers. The acid treated EFG-Si wafers were textured again using vapor by a mixture of HF and HNO_3 in the volume ratio 7:3 with 8 g of Si. The average surface reflectance of EFG-Si wafers subjected to one step acid texturing and two step acid texturing including vapor texturing were found to be 22.30% and 5.04%, respectively. The sheet resistance of EFG-Si wafers subjected to one step and double step acid texturing were 85 Ω/sq and 50 Ω/sq, respectively after phosphorous doping. After effective drive-in process accompanied by surface passivation, a sheet resistance of about 45 Ω/sq was achieved for both types of wafers subjected to two different texturing schemes. The effective minority carrier lifetime after vapor texturing and SiNx:H deposition was about 19.54 ㎲. SEM analysis of the surface morphology shows clear changes after each process.
한규민(Han Kyumin),고종현(Ko Jonghyun),정원대(Jung Wondea),강정석(Kang Jungseok) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
In order to prevent railway accidents due to human errors which have been recognized to be the most important cause in the railway accidents, human errors should have been controlled based on systematical analysis of the human errors, and countermeasures should be derived to reduce human error probability. Among several factors inducing human errors, task load (or task complexity) is representative. In order to reduce the human error, a systematic analysis should be undertaken to evaluate task load. In this study, task load according to task types of railway worker who are a safety critical staff have been quantitatively analyzed based on NASA-TLX(Task Load Index).
습식텍스쳐를 이용한 단결정 실리콘 광학적 · 전기적 특성 연구
한규민(Han Kyu-min),유진수(Yoo Jin-su),유권종(Yoo Kwon-jong),이희덕(Lee Hi-deok),최성진(Choi Sung-jin),권준영(Kwon Jun-young),이준신(Yi Jun-sin) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4
The presence of ultrasonic wave in caustic cleaning process enhances the remove pollutants, and more homogeneous, textured structure. The silicon wafers, cleaning in Deconex OF 145 solution (0.5~2wt %) with DIW under ultrasonic environment for 5 min. The presence of uniform thin layer of SiO2 on c-Si surface enhances etching rate in the caustic etching mixture solution of NaOH (1.5 wt %), DI water and IPA (6 wt %) at 90℃ for 20 min and results in a fine, more homogeneous and small textured structure.
습식텍스쳐를 이용한 삼결정 실리콘 광학적.전기적 특성 연구
한규민(Han, Kyu-Min),유진수(Yoo, Jin-Su),유권종(Yoo, Kwon-Jong),이희덕(Lee, Hi-Deok),최성진(Choi, Sung-Jin),권준영(Kwon, Jun-Young),김기호(Kim, Ki-Ho),이준신(Yi, Jun-Sin) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
Two different wet etching solutions, NaOH 40% and Acid, were used for etching in tri-crystalline Silicon(Tri-Si) solar cell fabrication. The wafers etched in NaOH40% solution showed higher reflectance compared to the wafers etched in Acid solution after SiN_x deposition. In light current-voltage results, the cells etched in Acid solution exhibited higher short circuit current and open circuit voltage than those of the cells etched in NaOH 40% solution. We have obtained 16.70% conversion efficiency in large area(156cm²) Tri-Si solar cells etched in Acid solution.
습식텍스쳐를 이용한 다결정 실리콘 광학적ㆍ전기적 특성 연구
한규민(Kyumin Han),유진수(Jinsu Yoo),유권종(Kwonjong Yoo),이희덕(Hideok Lee),최성진(Sungjin Choi),권준영(Junyoung Kwon),김기호(Kiho Kim),이준신(Junsin Yi) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.2009 No.11월
Multi-crystalline silicon surface etching without grain-boundary delineation is a challenging task for the fabrication of high efficiency solar cell. The use of sodium hydroxide - sodium hypochlorite (NaOH40% + NaOCl 12%) solution for texturing multi-crystalline silicon wafer surface in solar cell fabrication line is reported in this article. in light current-voltage results, the cells etched in NaOH 40% + NaOCl 12% = 1:2 exhibited higher short circuit current and open circuit voltage than those of the cells etched in NaOH 40% + NaOCl 12% = 1:1 solution. we have obtained 15.19% conversion efficiency in large area(156㎠) multi-Si solar cells etched in NaOH 40% + NaOCl 12% = 1:1 solution.
레이저를 이용한 결정질 실리콘 태양전지의 Double Texturing 제조 및 특성
권준영,한규민,최성진,송희은,유진수,유권종,김남수,Kwon, Jun-Young,Han, Kyu-Min,Choi, Sung-Jin,Song, Hee-Eun,Yoo, Jin-Soo,Yoo, Kwon-Jong,Kim, Nam-Soo 한국재료학회 2010 한국재료학회지 Vol.20 No.12
In this paper, double texturization of multi crystalline silicon solar cells was studied with laser and reactive ion etching (RIE). In the case of multi crystalline silicon wafers, chemical etching has problems in producing a uniform surface texture. Thus various etching methods such as laser and dry texturization have been studied for multi crystalline silicon wafers. In this study, laser texturization with an Nd:$YVO_4$ green laser was performed first to get the proper hole spacing and $300{\mu}m$ was found to be the most proper value. Laser texturization on crystalline silicon wafers was followed by damage removal in acid solution and RIE to achieve double texturization. This study showed that double texturization on multi crystalline silicon wafers with laser firing and RIE resulted in lower reflectance, higher quantum yield and better efficiency than that process without RIE. However, RIE formed sharp structures on the silicon wafer surfaces, which resulted in 0.8% decrease of fill factor at solar cell characterization. While chemical etching makes it difficult to obtain a uniform surface texture for multi crystalline silicon solar cells, the process of double texturization with laser and RIE yields a uniform surface structure, diminished reflectance, and improved efficiency. This finding lays the foundation for the study of low-cost, high efficiency multi crystalline silicon solar cells.
홍윤경,손현미,한규민 부산대학교 간호과학연구소 2023 글로벌 건강과 간호 Vol.13 No.1
Purpose: This study aimed to investigate the family dynamics affecting parenting by exploring the experiences related to caring of married immigrant women and Korean husbands in multicultural families with young children. Methods: The data were collected through focus group interviews with 10 married immigrant women and 10 Korean husbands. The interviews were conducted from October 24, 2016, to April 30, 2017. The transcribed data were analyzed using qualitative content analysis. Results: Based on an analysis of the dynamics of the factors influencing family relationships in multicultural families with young children, four categories and eight subcategories were derived from the role transition to parents of multicultural families and the establishment of norms for parenting children in multicultural families. Conclusion: Multicultural families experience conflicts regarding raising children due to differences in their culture and norms. Additionally, due to the unequal status at the beginning of the family formation, the performance and authority for child rearing are inconsistent, leading to increased confusion and conflict. To adjust and negotiate the family's status, norms, and roles, efforts to communicate and mutual understanding within the family are paramount. Therefore, family nursing intervention should be applied to couples to train the husband and wife's role recognition and conflict coping strategies to support parenting in multicultural families.
유진수,조준식,한규민,이준신 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.5
The tricrystalline silicon (Tri-Si) is a promising material for reducing the cost of solar cells fabrication due to its lower cost, thinner wafer, and fast processing as a result of better mechanical strength. However, surface texturing using alkaline solution is ineffective for high efficiency silicon solar cells due to its (110) orientation. In this study, we performed surface texturing with acidic mixture (HF, HNO<SUB>3</SUB>, DI water) to create a uniformly textured surface and to dislocate or stain etching. The textured silicon surface by acidic solution was also investigated through surface reflectance for light trapping compared with the silicon surface textured by conventional alkaline solution. Using the optimum process condition, a fill factor of 80% has been obtained with a conversion efficiency of 16.79% in a tricrystalline silicon wafer of an active surface area of 156 cm<SUP>2</SUP>. This result is mainly due to an increase in short-circuiting current density. It is, therefore, possible to fabricate the thin tricrystalline silicon solar cell of high efficiency and low cost.