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Park, Sanguk,Kim, Yunseok,You, Joonho,Kim, Seung-Woo Elsevier 2017 CIRP annals ... manufacturing technology Vol.66 No.1
<P><B>Abstract</B></P> <P>Chemically strengthened glass used for smartphones and tablets is cut into elaborate shapes by creating internal cracks using femtosecond laser pulses. The peak power is set at near ionization intensities of ∼10<SUP>14</SUP> W/cm<SUP>2</SUP> to initiate sub-surface cracks by strong nonlinear absorption underneath the stress-compressed glass surface at a 560μm depth. Then sub-surface cracks are laterally guided with a feed-rate of 5–40mm/s to realize accurate cutting along tensile-residual-stress lines formed around the material-modified zone inside the glass substrate. The cutting plane maintains a mirror-like cross-section profile without excessive flaws and thermal damage usually seen in conventional laser ablation.</P>
Park, Sanguk,Kang, Byeongkwan,Choi, Myeong-in,Jeon, Seonki,Park, Sehyun Elsevier 2018 Sustainable cities and society Vol.39 No.-
<P><B>Abstract</B></P> <P>Currently, many researchers worldwide are focusing on creating a novel service model by integrating IoT (Internet of Things) technologies with ICT (Information and Communications Technologies) to increase energy efficiency by reducing power consumption and greenhouse gas emissions. This paper examines the problems related to the current integrated ESS (Energy Storage System) in a smart grid: high installation costs and low management efficiency. To solve these problems, this paper studies the development of a micro-distributed ESS in an intelligent LED (Light Emitting Diode) streetlight system, and its low-cost installation and high management efficiency in a micro grid. Through the application of this system, the initial installation costs can be reduced by using micro-distributed ESS and IoT-based intelligent energy management, facilitating power monitoring of the streetlights and energy efficient demand resource management in the micro grid. This provides a more intelligent and efficient environment, such as in a smart-city.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This system is sufficient for providing alternative power using intelligent power peaks and demand resource management. </LI> <LI> These functions include power demand management, power stabilization, alternative power, and energy conservation. </LI> <LI> The LED system has advantages from the viewpoint of energy efficiency and service at the same time. </LI> <LI> In the future, this system can provide intelligent energy IoT services in cities for sustainability. </LI> <LI> This system can extend the core service technology in various fields such as the power demand management business. </LI> </UL> </P>
선택적 캐리어 수집을 위한 터널 산화막을 이용한 결정질 실리콘 태양전지
한상욱(Sanguk Han),심경배(Gyungbae Shim),박수영(Sooyoung Park),안시현(Shihyun Ahn),박철민(Cheolmin Park),조영현(Younghyun Cho),김현후(Hyunhoo Kim),이준신(Junsin Yi) 한국신재생에너지학회 2017 신재생에너지 Vol.13 No.3
In silicon solar cells, the doping process is performed to form a Back Surface Field (BSF) layer and is followed by many other processes. In this study, phosphorus doped a-Si:H doped at a high concentration in the tunnel oxide layer was crystallized through furnace annealing and Excimer Laser Annealing (ELA), in order to apply it to the Polycrystalline (Poly) - BSF layer in the Tunnel Oxide Passivated Contact (TOPCon) structure. In the excimer laser annealing fabrication process, an XeCl excimer laser with a wavelength of 308 nm was used, and the thickness of the a-Si layer and energy density of the laser were varied from 20 to 40 nm and from 390 to 450 mJ/cm², respectively. The highest carrier lifetime and implied VOC were found to be 588 ㎲ and 697 mV, respectively, at an a-Si thickness of 20 nm and energy density of the laser of 450 mJ/cm². The TOPCon cell was fabricated using wet oxidation and plasma oxidation. Its efficiency and FF were found to be higher when fabricated using the wet process, with values of 19.41% and 74.8%, respectively, while its VOC and JSC values were higher when it was fabricated using plasma oxidation, with values of 41.04 mJ/cm² and 644 mV, respectively. Therefore, if the conditions providing for a high implied VOC and carrier lifetime and sufficient crystallization were found, the efficiency of n-type TOPCon solar cells could be increased.