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양자효과를 고려한 실리콘 나노선 트랜지스터의 채널 크기에 따른 전도 및 전하분포 특성 시뮬레이션
황민영,최창용,문경숙,구상모,Hwang, Min-Young,Choi, Chang-Yong,Moon, Kyoung-Sook,Koo, Sang-Mo 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.9
We report numerical simulations to investigate of the dependendce of the on/off current ratio and channel charge distributions in silicon nanowire (SiNW) field-effect transistors (FETs) on the channel width and thicknesses. In order to investigate the transport behavior in devices with different channel geometries, we have performed detailed two-dimensional simulations of SiNWFETs and control FETs with a fixed channel length L of $10\;{\mu}m$, but varying the channel width W from 5 nm to $5\;{\mu}m$, and thickness t from 10 nm to 30 nm. We have show that $Q_{ON}/Q_{OFF}$ drastically decreases (from $^{\sim}2.9{\times}10^4$ to $^{\sim}9.8{\times}10^3$) as the channel thickness increases (from 10 nm to 30 nm). As a result of the simulation using a quantum model, even higher charge density in the bottom of SiNW channel was observed then in the bottom of control channel.
황민영,김용균,전충환,송주헌,김용태,장윤한,Hwang, Min-Young,Kim, Yong-Gyun,Jeon, Chung-Hwan,Song, Ju-Hun,Kim, Yong-Tae,Chang, Youn-Han 한국전기화학회 2009 한국전기화학회지 Vol.12 No.2
리튬 2차전지는 휴대용 전자기기의 전원으로 사용되어 왔다. 최근 하이브리드 자동차, 전기자동차의 에너지 저장매체로써 적용으로 인해 시장 확대가 기대되고 있다. 양극 활물질은 리튬2차전지의 성능, 수명, 용량을 결정하는 물질이며, 급증하는 시장의 수요에 따라 양극 활물질을 대량으로 생산할 수 있는 기술을 개발하는 것이 시급하다. 본 연구에서 실제 양극 활물질($LiCoO_2$) 생산라인에서 가동 중인 소성로를 3D 모델링하였고, 수치적 해석을 통해 소성로 내부의 온도와 유동의 방향, 화학적 거동을 밝혀내었다. 결과로써, 생산량 증가로 인해 소성로에서 생성되는 $CO_2$ 농도가 증가하며 정체되는 지점을 확인하였고, TGA-DSC 실험을 통해 $CO_2$가 몰분율 15%이상에선 $LiCoO_2$의 적절한 형성에 영향을 주는 현상을 확인하였다. 또한 소성로의 형상변화와 공정조건의 변화를 통해 문제되는 $CO_2$를 원활히 배출할 수 있는 해결책을 제안하였다. Lithium secondary batteries have been widely used in the portable electric devices as power source. Recently it is expected that the realm of its applications expands to the markets such as energy storage medium of hybrid electric vehicle(HEV), electric vehicle(EV). Cathode active material is crucial in terms of performance, durability, capacity of lithium secondary batteries. It is urgent to develope the technology for mass production of cathode material to cope with the markets' demands in the near future. In this study, a calcination furnace running in real production line is modelled in 3D, and the thermal flow and gas flow after chemical reaction in the furnace is analyzed through numerical computations. Based on the results, it is shown that large volume of $CO_2$ gas is generated from chemical reaction. High concentration of $CO_2$ gas and it's stagnation is clearly found from the reactant containers in which the reaction occur to the bottom area of the furnace. It is also studied that 15% or more $CO_2$ mol fraction could affect to proper formation of $LiCoO_2$ through TGA-DSC analysis. The solutions to evacuate carbon dioxide from the furnace are suggested through the change of furnace design and operating condition as well.
황민영(Hwang min young),이종우(Lee jong woo),김용균(Kim yong gyun),전상훈(Jeon Sang hun),장윤한(Chang youn-han),전충환(Jeon chung hwan) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Secondary batteries are uesd cell phone and notebook computer. Cathode active material for the secondary battery is processed in high temperature furnace. Optimizing design for furnace is important to get the best quality of the material. Numerical approach for analyzing the fluid flow in the furnace saves time and money in comparison with experimental method. In this study, a furnace modeled and the boundary conditions are set for CFD analysis. The characteristic of the fluid thermal flow is obtained.