• Title/Summary/Keyword: Wet oxidation method

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A study on the Electric Breakdown Mechanisms using Self-helfing Method of Thin Film (Self-healing 방법을 이용한 박막의 절연파괴 현상 연구)

  • Yun, J.R.;Kwon, C.R.;Se, K.W.;Park, I.H.;Lee, H.Y.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1992.11a
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    • pp.11-13
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    • 1992
  • The dielectric reliability of the Thin $SiO_2$ films of wet oxidation on n-type Si substrates has been studied by using self-healing method of breakdown and according to injection time high frequence C-V tests. These experiments have been performed to investigate the dielectric breakdown mechanism of a thin film in which positive charge generation during high-field Fowler-Nordheim tunneling are considered. In addition, The weak spots and robust areas are distinguished so that the localized dielectric breakdown could be described.

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Estimation of mechanical damage by minority carrier recombination lifetime and near surface micro defect in silicon wafer (실리콘 웨이퍼에서 소수 반송자 재결합 수명과 표면 부위 미세 결함에 의한 기계적 손상 평가)

  • 최치영;조상희
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.9 no.2
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    • pp.157-161
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    • 1999
  • We investigated the effect of mechanical back side damage in Czochralski silicon wafer. The intensity of mechanical damage was evaluated by minority carrier recombination lifetime by laser excitation/microwave reflection photoconductance decay ($\mu$-PCD) technique, wet oxidation/preferential etching methods, near surface micro defect (NSMD) analysis, and X-ray section topography. The data indicate that the higher the mechanical damage intensity, the lower the minority carrier lifetime, and NSMD density increased proportionally, also correlated to the oxidation induced stacking fault (OISF) density. Thus, NSMD technique can be used separately from conventional etching method in OISF measurement.

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Sintering Characteristics of Nickel Powders for Internal Electrode of Multilayer Ceramic Capacitors (적층 세라믹 콘덴서의 내부전극용 니켈 분말의 소결 특성)

  • Lee, Sang-Geun;Choi, Eun-Young;Lee, Yoon-Bok;Park, Suong-Soo;Park, Hee-Chan;Kim, Kwang-Ho
    • Korean Journal of Materials Research
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    • v.13 no.12
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    • pp.779-784
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    • 2003
  • Nickel powders were obtained by various preparation methods, and their sintering characteristics were investigated. Nickel powders made by wet chemical process (WCP) had a higher surface area and more narrow size distribution than that of chemical vapor deposition (CVD) method. Nickel-oxide powders by the WCP method were prepared at $200^{\circ}C$ for 3 hr. The oxidation behaviour of nickel-oxide powder is similar with that of the CVD method. Nickel powders made by the WCP method showed a higher shrinkage in the range of $600^{\circ}C$$900^{\circ}C$ than that of commercial powder made by the CVD method. The similar results were observed on the surface microstructure of sintered bodies by SEM measurements.

Effect of mechanical backside damage upon minority carrier recombination lifetime measurement by laser/microwave photoconductance technique (기계적 후면 손상이 레이저/극초단파 광전도 기법에 의한 소수 반송자 재결합 수명 측정에 미치는 영향)

  • 조상희;최치영;조기현
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.5 no.4
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    • pp.408-413
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    • 1995
  • We investigated the effect of mechanical backside damage upon minority carrier recombination lifetime measurement in Czochralski silicon substrate by laser excitation/microwave reflection photoconductance decay method. The intensity of mechanical damage was evaluated by X-ray double crystal rocking curve, X-ray section topography and wet oxidation/preferential etch methods. The data indicate that the higher the mechanical damage intensity, the lower the minority carrier lifetime, and the threshold full width at half maximum value which affect minority carrier lifetime measurement is about 13 secs.

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Effective surface passivation of Si solar cell using wet chemical solution (액상 공정을 이용한 실리콘 태양전지 표면 passivation)

  • Kim, U-Byeong;Kobayashi, Hikaru
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2014.11a
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    • pp.98-99
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    • 2014
  • 질산산화법(nitric acid oxidation method)은 저온에서 안정적인 산화막을 형성하는 직접산화공정으로 azeotropic point(68 wt%)인 120도 이하의 온도에서 산화막을 형성한다. 120도에서 형성한 질산산화막은 CVD법으로 형성한 산화막 보다 낮은 누설전류밀도(leakage current density)를 나타낸다. 또한 질산의 농도가 증가함에 따라 형성한 산화막의 누설전류밀도가 감소하며, 이는 열산화법으로 형성한 산화막 보다 낮다. 질산산화의 낮은 누설전류밀도는 형성한 산화막의 높은 원자 밀도와 낮은 계면준위밀도에 의한 것으로 이 특성을 이용하여 게이트 절연막(gate insulator)과 태양전지의 passivation막으로 응용되고 있다.

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Evaluation of mechanical backside damage by minority carrier recombination lifetime and photo-acoustic displacement method in silicon wafer (실리콘 웨이퍼에서 광열 변위법과 소수 반송자 재결합 수명 측정에 의한 기계적 후면 손상 평가)

  • 최치영;조상희
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.8 no.1
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    • pp.117-123
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    • 1998
  • We investigated the effect of mechanical backside damage in Czochralski grown silicon wafer. The intensity of mechanical damage was evaluated by minority carrier recombination lifetime by laser excitation/microwave reflection photoconductivity decay method, photo-acoustic displacement method, X-ray section topography, and wet oxidation/preferential etching methods. The data indicate that the higher the mechanical damage intensity, the lower the minority carrier lifetime, and the photo-acoustic displacement values increased proportionally, and it was at Grade 1: Grade 2:Grade 3 = 1:19.6:41 that the normalized relative quantization ratio of excess photo-acoustic displacement in damaged wafer was calculated, which are normalized to the excess PAD from sample Grade 1.

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Effects of $Mn_2O_3, Y_2O_3$ Additives and Valence State of Mn ion in $Sr(Zr, Ti)O_3$ Microwave Dielectrics ($Sr(Zr, Ti)O_3$ 마이크로파 유전체에 첨가된 $Mn_2O_3, Y_2O_3$ 의 영향과 Mn의 산화상태)

  • 정하균;박도순;박윤창
    • Journal of the Korean Ceramic Society
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    • v.34 no.6
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    • pp.583-590
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    • 1997
  • The effects of Mn2O3 and Y2O3 additives on the microstructure and dielectric properties of Sr(Zr, Ti)O3 have been investigated. Powders with Sr(Zr1-xTix)O3(0$\leq$x$\leq$0.1) composition were prepared by the conventional solid state processing from commercial TiO2 and precipitation-processed ZrO2. The powders containing sintering additives of Mn2O3 and Y2O3 were compacted and then sintered at 1,55$0^{\circ}C$ for 4 h to get>97% relative density. Mn2O3 suppressed the grain growth and Y2O3 enhanced the density of sintered body. The oxidation state of Mn ions were determined by a chemical wet method and EPR spectroscopy. Mn ions were present as Mn2+ and Mn4+ in SrZrO3, while as Mn3+ and Mn4+ in Ti-substituted Sr(Zr, Ti)O3. With the substitution of Ti, the lattice parameters of SrZrO3 decreased and its dielectric constant increased with remarkable decrease in Q value. The dielectric constant of Sr(Zr, Ti)O3 was in the range of 30 to 40, Q values 1,200~5,400 at 6 GHz and temperature coefficient of resonant frequency -67~100 ppm/K.

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Implementation of an Intelligent Video Detection System using Deep Learning in the Manufacturing Process of Tungsten Hexafluoride (딥러닝을 이용한 육불화텅스텐(WF6) 제조 공정의 지능형 영상 감지 시스템 구현)

  • Son, Seung-Yong;Kim, Young Mok;Choi, Doo-Hyun
    • Korean Journal of Materials Research
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    • v.31 no.12
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    • pp.719-726
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    • 2021
  • Through the process of chemical vapor deposition, Tungsten Hexafluoride (WF6) is widely used by the semiconductor industry to form tungsten films. Tungsten Hexafluoride (WF6) is produced through manufacturing processes such as pulverization, wet smelting, calcination and reduction of tungsten ores. The manufacturing process of Tungsten Hexafluoride (WF6) is required thorough quality control to improve productivity. In this paper, a real-time detection system for oxidation defects that occur in the manufacturing process of Tungsten Hexafluoride (WF6) is proposed. The proposed system is implemented by applying YOLOv5 based on Convolutional Neural Network (CNN); it is expected to enable more stable management than existing management, which relies on skilled workers. The implementation method of the proposed system and the results of performance comparison are presented to prove the feasibility of the method for improving the efficiency of the WF6 manufacturing process in this paper. The proposed system applying YOLOv5s, which is the most suitable material in the actual production environment, demonstrates high accuracy (mAP@0.5 99.4 %) and real-time detection speed (FPS 46).

The Analysis and Isolation of Component from Liquefied Wastepaper (폐지 용액화물로부터 성분분리 및 분석)

  • Chang, Jun-Pok;Yang, Jae-Kyung;Lim, Bu-Kug;Lee, Jong-Yoon
    • Journal of the Korean Wood Science and Technology
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    • v.32 no.1
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    • pp.9-16
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    • 2004
  • This research was carried out to investigate the component isolation method from liquefied waste paper. and isolated component was analyzed by molecular weight distribution with gel chromatography and nitrobenzene-oxidation analysis. In the aspect of liquefaction ratio, wet defibration fiber are better than dry defibration fiber because of wet defiberation fiber was easy to access of chemical solution. The optimal liquefaction condition of waste paper was treated at 190℃ for 60 min(cresol 2 ㎖, water 4 ㎖, phosphoric acid 0.5 ㎖ based on waste paper 1 g). In the liquefied waste paper, lignin and carbohydrate were separated with two interfacial layer(cresol layer, water layer). In the chemical analysis of isolated lignin, molecular weight distribution of isolated lignin was below 1,000.

Effect of Pt/Al2O3-based Catalysts on Removal Efficiency of Hydrogen (Pt/Al2O3계 촉매의 특성이 수소제어 활성에 미치는 영향 연구)

  • Won, Jong Min;Hong, Sung Chang
    • Applied Chemistry for Engineering
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    • v.28 no.2
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    • pp.221-229
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    • 2017
  • In this study, a wet impregnation method was applied to catalysts based on the active metal Pt in order to confirm the oxidation characteristics of various commercial alumina supports at room temperature. The catalysts were characterized using XPS, CO-chemisorption, and BET. Various $Pt/Al_2O_3$ catalysts controlled the oxygen species of Pt by the electronegativity of electrons and charges when the catalyst was prepared according to the heat treatment conditions. The reason that the dispersion degree decreases with increasing Pt loading seems to be attributed to HT (Huttig Temperature) of Pt. In addition, the minimum hydrogen concentration that can be controlled at room temperature can control hydrogen from metallic Pt up to 1.0 vol% at over 70.09% in the catalyst.