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결정질 실리콘 태양전지의 저가 고 효율화를 위한 Ni/Cu/Ag 전극 태양전지
조경연(Kyeong-yeon Cho),이지훈(Ji-hun Lee),이수홍(Soo-hong Lee) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.- No.-
In high-efficiency crystalline silicon solar cells, If high-efficiency solar cells are to be commercialized , It is need to develop superior contact formation method and material that can be inexpensive and simple without degradation of the solar cells ability. For reason of plated metallic contact is not only high metallic purity but also inexpensive manufacture. It is available to apply mass production. Especially, Nickel, Copper and Silver are applied widely in various electronic manufactures as easily formation is available by plating. The metallic contact system of silicon solar cell must have several properties, such as low contact resistance, easy application and good adhesion. Ni is shown to be a suitable barrier to Cu diffusion as well as desirable contact metal to silicon. Nickel monosilicide(NiSi) has been suggested as a suitable silicide due to its lower resistivity, lower sintering temperature and lower layer stress than TiSi₂. Copper and Silver can be plated by electro & light-induced plating method. Light-induced plating makes use the photovoltaic effect of solar cell to deposite the metal on the front contact. The cell is immersed into the electrolytic plating bath and irradiated at the front side by light source, which leads to a current density in the front side grid. Electroless plated Ni/ Electro&light-induced plated Cu/ Light-induced plated Ag contact solar cells result in an energy conversion efficiency of 14.68 % on 0.2∼0.6 Ωㆍ㎝, 20 × 20 ㎟, CZ(Czochralski) wafer.
고효율 태양전지의 저가화를 위한 Ni/Cu/Ag 전극의 Ni Silicide 형성에 관한 연구
김종민(Kim Jong-Min),조경연(Cho Kyeong-Yeon),이지훈(Lee Ji-Hun),이수홍(LEE Soo-Hong) 한국태양에너지학회 2009 한국태양에너지학회 학술대회논문집 Vol.- No.-
It is significant technique to increase competitiveness that solar cells have a high energy conversion efficiency and cost effectiveness. When making high efficiency crystalline Si solar cells, evaporated Ti/Pd/Ag contact system is widely used in order to reduce the electrical resistance of the contact fingers. However, the evaporation process is no applicable to mass production because high vacuum is needed. Furthermore, those metals are too expensive to be applied for terrestrial applications. Ni/Cu/Ag contact system of silicon solar cells offers a relatively inexpensive method of making electrical contact. Ni silicide formation is one of the indispensable techniques for Ni/Cu/Ag contact sysytem. Ni was electroless plated on the front grid pattern, After Ni electroless plating, the cells were annealed by RTP(Rapid Thermal Process). Ni silicide(NiSi) has certain advantages over Ti silicide(TiSi₂), lower temperature anneal, one step anneal, low resistivity, low silicon consumption, low film stress, absence of reaction between the annealing ambient. Ni/Cu/Ag metallization scheme is an important process in the direction of cost reduction for solar cells of high efficiency. In this article we shall report an investigation of rapid thermal silicidation of nickel on silngle crystalline silicon wafers in the annealing range of 350-390℃. The samples annealed at temperatures from 350 to 390℃ have been analyzed by SEM(Scanning Electron Microscopy).
Selective emitter를 이용한 태양전지 효율 향상
홍근기(Hong, Kuen-Kee),조경연(Cho, Kyeong-yeon),서재근(Seo, Jae-Keun),오동준(Oh, Dong-Joon),심지명(Shim, Ji-Myung),이현우(Lee, Hyun-Woo),김지선(im, Ji-Sun),신정은(Shin, Jeong-Eun),김지수,이은주(Lee, Eun-Joo),이수홍(Lee, Soo-Hong),이해석 한국태양에너지학회 2011 한국태양에너지학회 학술대회논문집 Vol.2011 No.11
The process conditions for high efficiency industrial crystalline Si solar cells with selective emitter were optimized. In the screen printed solar cells, the sheet resistance must be 50-60V/sq. because of metal contact resistance. But the low sheet resistance causes the increase of the recombination and blue response at the short wavelength.Therefore, the screen printed solar cells with homogeneous emitter have limitations of efficiency, and this means that the selective emitter must be used to improve cell efficiency. This work demonstrates the feasibility of a commercially available selective emitter process, based on screen printing and conventional diffusion process. Now,we improved cell efficiency from 18.29% to18.45% by transition of heavy emitter pattern and shallow emitter doping condition.
항공전자 시스템에서 ARINC653 기반의 FACE를 준수하는 IOS 및 TS 세그먼트 구조 설계
이두환 ( Doo-hwan Lee ),남영욱 ( Young-uk Nam ),조경연 ( Kyeong-yeon Cho ),윤지용 ( Ji-yong Yoon ) 한국항행학회 2023 韓國航行學會論文誌 Vol.27 No.4
항공전자 시스템의 복잡성이 높아짐에 따라 소프트웨어 컴포넌트의 이식성 및 재사용성이 강조되었다. 본 논문에서는 ARINC 653 요구사항을 만족하는 VxWorks 653 운용 환경에서 FACE(The Future Airborne Capability Environment)표준에 적합한 IOSS(Input Output Service Segment) 및 TSS(Transport Service Segment)에 대한 구조 설계 방안을 설명한다. IOSS 및 TSS는 각각 다른 파티션에서 독립적으로 동작하게 하여 시/공간 분리 및 다른 소프트웨어의 영향성을 최소화 하였고, 이식성 및 재사용성을 높이기 위해 디자인 패턴 중 전략 패턴을 적용하였다. 또한, IOSS는 Distributed IO Service 구조를 적용하여 외부 인터페이스 서비스를 제공하고, 외부 인터페이스 중 FACE를 적용한 장비의 ARINC 664 P7 인터페이스는 TSS에 배치하여 데이터 이동 경로를 최적화 하였다. The increasing complexity of avionics systems has emphasized the portability and reusability of software components. In this paper, a structural design method for IOSS (Input Output Service Segment) and TSS (Transport Service Segment) complying with the FACE (The Future Airborne Capability Environment) standard in the VxWorks 653 operating environment that satisfies ARINC 653 requirements is described. IOSS and TSS operate independently in different partitions to minimize time/space separation and the influence of other software, and to increase portability and reusability, strategy patterns among design patterns are applied. In addition, IOSS provides external interface service by applying distributed IO service structure, and among external interfaces, the ARINC 664 P7 interface of FACE-compliant equipment is placed in TSS to optimize the data movement path.