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Jang, Kyungsoo,Lee, Sojin,Nguyen, Thi Cam Phu,Park, Heejun,Kim, Jungsoo,Shin, Donggi,Lee, Youn-Jung,Kim, Youngkuk,Yi, Junsin IOP 2018 Semiconductor science and technology Vol.33 No.12
<P>Non-volatile memory (NVM) devices using carbon dioxide (CO<SUB>2</SUB>) and nitrous oxide (N<SUB>2</SUB>O) plasma-assisted tunneling layers have outstanding electrical properties measured at 300 K. However, the retention characteristics of NVM devices using CO<SUB>2</SUB> and N<SUB>2</SUB>O plasma-assisted tunneling oxides are different at 360 K. The memory window of an NVM device using CO<SUB>2</SUB> tunneling oxide was about 2.01 V (81.7%) after 10 years at 360 K. However, there was retention charge loss in the NVM device using a N<SUB>2</SUB>O tunneling layer at 360 K due to the temperature instability under negative bias. For an actual NVM device using N<SUB>2</SUB>O tunneling oxide, the memory window was reduced to about 1.58 V (65.6%) after 10 years at 360 K.</P>
Jang, Kyungsoo,Iftiquar, S. M.,Lee, Youn-Jung,Jung, Junhee,Kim, Taeyong,Kang, Seungmin,Lee, Sojin,Cho, Jaehyun,Yi, Junsin American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.11
<P>We report a reasonable method for determination of optical band gap (E-g) and germanium content (x) of hydrogenated micro-crystalline silicon-germanium (mu c-Si1-xGex:H) thin-film by using ultraviolet-visible (UV-visible) and Auger electron spectroscopy (AES) measurements. For reasonable extraction of the E-g of mu c-Si1-xGex:H film, we used a plot of (alpha h nu)(1/4) versus photon energy (E-ph) for a wide range of E-ph. The simplest explanation of the 1/4 power could be a superposition of absorptions from micro-crystalline structure. We also measured the x as a function of E-g of the mu c-Si1-xGex:H thin-film. Using UV-visible, E-g was measured to be varying from 1.043 to 1.079 eV and x was extracted to be between 0.107 to 0.188. From AES measurements, the E-g was extracted between 1.045 to 1.075 eV while x was measured between 0.110 to 0.182. The results of the comparative analysis of UV-visible and AES measurement were performed.</P>
Kyungsoo Jang,Raja, Jayapal,Youn-Jung Lee,Doyoung Kim,Junsin Yi IEEE 2013 IEEE electron device letters Vol.34 No.9
<P>We report the effects of carrier concentration (NCH), indium (In) content, and crystallinity (X<SUB>c</SUB>) on the electrical properties of indium-tin-zinc-oxide (ITZO) thin-film transistors (TFTs). The ITZO TFT with the lowest NCH, In content, and amorphous phase at the optimized oxygen flow rate has high field-effect mobility a (μ<SUB>FE</SUB>) of 37.2 cm<SUP>2</SUP>/V·s, high ON/OFF current ratio (I<SUB>ON</SUB>/I<SUB>OFF</SUB>) of ~ 1×10<SUP>7</SUP>, and low subthreshold swing (S.S) of 0.93. With increasing NCH, In content, and X<SUB>c</SUB>, μ<SUB>FE</SUB>, I<SUB>ON</SUB>/I<SUB>OFF</SUB>, and S.S surprisingly degraded to 14.4 cm<SUP>2</SUP>/V·s, ~ 4×10<SUP>4</SUP>, and 4.01, respectively. Our high ITZO TFTs with μ<SUB>FE</SUB> of 37.2 cm<SUP>2</SUP>/V·s, obtained thorough control of the N<SUB>CH</SUB>, In content, and X<SUB>c</SUB>, was suitable for application to next generation ultrahigh resolution displays as well as high frame rate displays.</P>
신해양발전플랜트 : 조력발전과 해류발전을 겸하는 통합발전시스템
장경수(KyungSoo Jang) 대한토목학회 2011 대한토목학회지 Vol.59 No.5
해양에너지를 얻는 방법 중에서 조력발전은 방조제 건설로 인한 공사비가 많이 들고, 환경 및 생태계에 미치는 부정적인 영향이 있는 것으로 알려져 있다. 그래서 해양 선진국에서는 보다 친환경적인 조류발전의 개발 및 상용화에 박차를 가하고 있다. 지금까지 조력발전과 조류발전은 서로 다른 지역에서 적용하는 것으로 알려져 있지만 본 연구에서는 조력발전과 조류발전의 물리적 이론을 융합하는 해류발전의 개념을 정의하고 신해양발전플랜트 산업을 제시하고, 그 일례로써 조력발전과 해류발전을 겸하는 통합발전시스템의 가능성과 비전을 알아보았다.
장주연(Jang, Juyeon),박형식(Park, Hyeongsik),안시현(Ahn, Sihyun),조재현(Jo, Jaehyun),장경수(Jang, Kyungsoo),이준신(Yi, Junsin) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
Cost efficient and large area deposition of superior quality Al₂O₃ doped zinc oxide (AZO) films is instrumental in many of its applications including solar cell fabrication due to its numerous advantages over ITO films. In this study, AZO films were prepared by a highly efficient rotating cylindrical dc magnetron sputtering system using AZO target, which has a target material utilization above 80%, on glass substrates in argon ambient. A detailed analysis on the electrical, optical and structural characteristics of AZO thin films was carried out for solar cell application. The properties of films were found to critically depend on deposition parameters such as sputtering power, substrate temperature, working pressure, and thickness of the films. A low resistivity of {sim}5.5{times}10-4{Omega}-cm was obtained for films deposited at 2kW, keeping the pressure and substrate temperature constant at 3 mtorr and 230?C respectively, mainly due to an increase in carrier mobility and large grain size which would reduce the grain boundary scattering. The increase in carrier mobility with power can be attributed to the columnar growth of AZO film with (002) preferred orientation as revealed by XRD analysis. The AZO films showed a high transparency of>87% in the visible wavelength region irrespective of deposition conditions. Our results offers a cost-efficient AZO film deposition method which can fabricate films with significant low resistivity and high transmittance that can find application in thin-film solar cells.
Ocean Current Power Parks using Garyuk Draining Sluices of Saemankeum
장경수(Jang, Kyungsoo),이정은(Lee, Jungeun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Two ocean current power parks are suggested in the front and back of the Garyuk draining sluices of Saemankeum in Korea. They are characterized by installing a plurality of ocean current turbine generators which are arranged in five rows respectively in the land-side ocean current power park behind the Garyuk draining sluices and in the sea-side ocean current power park before the Garyuk draining sluices, generating electricity using the ocean current flowing through the Garyuk draining sluices in the ebbs and tides of Yellow sea. The potential energy of tidal difference of 2.611m at neap in Saemankeum can be converted into the kinetic energy of high speed ocean current via the Garyuk draining sluices which makes it possible to run the ocean current power parks on a large scale. The total facility capacity of two ocean current power parks that consist of 240 ocean current turbine generators with 4m diameter of turbine blades is about 134MW, and the expected total annual power output is about 586GWh.
장경수(Jang, Kyungsoo) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
바다를 가로막는 방벽이나 방조제의 배수갑문 또는 조력발전소의 수문과 같이 인공 해양구조물을 통하여 흐르는 고속 해류를 이용하여 발전하는 해류발전 방식에 있어서, 고속 해류에 적합한 수차터빈과 발전기의 특성을 알아보았다. 조석간만의 차가 큰 지역에 설치되는 인공 해양구조물을 지나는 해류는 인공 해양구조물 전후에 발생하는 해수의 위치에너지 차이가 운동에너지로 바뀌면서 조석간만의 자연현상에 의해 발생되는 조류의 속도보다 훨씬 더 빠르게 흐른다. 이론적으로 우리나라의 서해안의 조석간만의 범위 3~8m로부터 7.5~12m/s 정도의 고속 해류가 가능하다. 이러한 경우에 적합한 해류발전기는 수차터빈 날개지름의 크기가 5m에서부터 12m 이하이면서, 증속기어박스와 발전기, 유압시스템 및 냉각시스템 그리고 전력변환장치를 포함하는 발전시설들을 해수면 위에 설치하는 것이 바람직하다.