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Enhancement of thermoelectric power factor by modulation doping of bulk polycrystalline SnS / thin film PEDOT:PSS bilayer
벌크 다결정 SnS / PEDOT:PSS 박막 이중층에서의 변조 도핑을 통한 열전 역률 강화
Dongwook Lee
Korean J. Met. Mater. 2022;60(7):531-536.   Published online 2022 Jun 3
DOI: https://doi.org/10.3365/KJMM.2022.60.7.531

Modulation doping occurs in a heterojunction where a charge carrier-rich material transfers charge to a carrier-deficient material. The modulation-doped material is intentionally selected to have higher charge carrier mobility than the modulation dopant material, so that the overall electrical conductivity can be boosted. Although this modulation doping strategy has proven..... More

Thickness Dependence of Cu-layer-based Transparent Heaters
Cu 박막의 두께 변화에 따른 면상발열체 특성 연구
Dooho Choi
Korean J. Met. Mater. 2022;60(7):511-516.   Published online 2022 Jun 3
DOI: https://doi.org/10.3365/KJMM.2022.60.7.511

In this study, ultrathin (4-40 nm) Cu-layer-based transparent heaters prepared on glass substrates were investigated for cost-effective applications. The Cu heaters were embedded between ZnO layers serving as anti-reflection and anti-corrosion layers. The Cu layer thicknesses varied in the range of 4-40 nm, and the corresponding structural, electrical, optical and..... More

Electrochemical Corrosion Resistance and Electrical Conductivity of Three-Dimensionally Interconnected Graphene-Reinforced Cu Composites
Xue Li, Ateeq Ahmed, Byung-Sang Choi
Korean J. Met. Mater. 2021;59(11):821-828.   Published online 2021 Oct 28
DOI: https://doi.org/10.3365/KJMM.2021.59.11.821

A three-dimensionally interconnected graphene-reinforced Cu (3Di Gr-Cu) composite was synthesized using a simple two-step process technique which involves the mechanical compaction of micronsized Cu particles followed by chemical vapor deposition (CVD) at 995 ℃. The microstructural properties of pure Cu and the 3Di Gr-Cu composite were investigated by optical..... More

                           Cited By 1
Effects of JGB Additives on the Microstructures and Electrical Properties of Electroplated Copper Foil
JGB 첨가제에 의한 동박의 미세구조변화와 전기적 특성
Tae-Gyu Woo, Il-Song Park
우태규, 박일송
Korean J. Met. Mater. 2021;59(6):404-411.   Published online 2021 May 26
DOI: https://doi.org/10.3365/KJMM.2021.59.6.404

Extremely thin film high quality copper foil is required to ensure high performance in electronics and slimness in secondary batteries. During the electroplating of copper foil, Janus Green B(JGB) and Collagen were introduced as additives to the electrolytes to study their effects. The structural and electrical properties of the electroplated..... More

                           Cited By 1
Effect of Pre-Aging Treatment on the Mechanical Properties of Cold Rolled Cu-6 wt% Ni-1.4 wt% Si Alloy
Cu-6 wt% Ni-1.4 wt% Si 합금의 압연 후 기계적 성질에 미치는 시효전 처리 영향
Sang Jin Lee, Hyeon Seok Shin, Eun-Ae Choi, Jee Hyuk Ahn, Yoonsuk Choi, Sangshik Kim, Jehyun Lee, Seung Zeon Han
이상진, 신현석, 최은애, 안지혁, 최윤석, 김상식, 이재현, 한승전
Korean J. Met. Mater. 2020;58(7):488-494.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.488

Cu-Ni-Si alloys were strengthened by Ni2Si intermetallic compound precipitation in a Cu matrix during aging. The Cu-6 wt% Ni-1.4wt%Si alloy was prepared by water quenching (solution treatment) or air cooling (homogenization treatment) after heating 980 oC for 2 hours and aging at 500 oC for 6 hours. After maintaining a..... More

                           Cited By 3
Prediction of Electropulse-Induced Nonlinear Temperature Variation of Mg Alloy Based on Machine Learning
기계 학습을 활용한 마그네슘 합금의 통전 비선형 온도 예측
Jinyeong Yu, Myoungjae Lee, Young Hoon Moon, Yoojeong Noh, Taekyung Lee
유진영, 이명재, 문영훈, 노유정, 이태경
Korean J. Met. Mater. 2020;58(6):413-422.   Published online 2020 May 19
DOI: https://doi.org/10.3365/KJMM.2020.58.6.413

Electropulse-induced heating has attracted attention due to its high energy efficiency. However, the process gives rise to a nonlinear temperature variation, which is difficult to predict using a traditional physics model. As an alternative, this study employed machine-learning technology to predict such temperature variation for the first time. Mg alloy..... More

                           Cited By 2
Visualization of Magnetic Domains in Electrical Steel Using High-Resolution Dark-Field Imaging
Youngju Kim, Jongyul Kim, Daniel Seth Hussey, Oh Youl Kwon, Seung Wook Lee
Korean J. Met. Mater. 2019;57(6):352-359.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.352

Electrical steel is a soft magnetic steel material used in electric devices such as transformers and motors. The performance of these electric devices is primarily related to the magnetic properties of electrical steel, and the assessment of the magnetic properties of electrical steel has been considered an important topic. We..... More

                           Cited By 2
Influence of Film Thickness on the Electrical and Optical Properties of ZnO/Ag/SnO<sub>2</sub> Tri-Layer Films
ZnO/Ag/SnO2 적층박막의 두께 변화에 따른 전기적, 광학적 특성 연구
Yu-Sung Kim, Jin-Young Choi, Yun-Je Park, Su-Hyeon Choe, Young-Min Kong, Daeil Kim
김유성, 최진영, 박윤제, 최수현, 공영민, 김대일
Korean J. Met. Mater. 2019;57(5):324-327.   Published online 2019 May 5
DOI: https://doi.org/10.3365/KJMM.2019.57.5.324

ZnO/Ag/SnO2 (ZAS) tri-layer films were prepared on glass substrates via RF and DC magnetron sputtering, and then the influence of the thickness of the ZnO and SnO2 layers on the optical and electrical properties of the ZAS films was investigated. As deposited ZnO 50 nm/Ag 10 nm/SnO2 50 nm films..... More

                           Cited By 6
Effect of Prior Cold Working before Aging on the Precipitation Behavior in a Cu-3.5 wt% Ti Alloy
Cu-3.5 wt% Ti 합금의 석출 거동에 미치는 시효 전 가공의 영향
Minah Jo, Eun-Ae Choi, Jee Hyuk Ahn, Young Guk Son, Kwangho Kim, Jehyun Lee, Satoshi Semboshi, Seung Zeon Han
조민아, 최은애, 안지혁, 손영국, 김광호, 이재현, 사토시 셈보시, 한승전
Korean J. Met. Mater. 2019;57(1):10-17.   Published online 2018 Dec 14
DOI: https://doi.org/10.3365/KJMM.2019.57.1.10

Cu-Ti alloys were strengthened by Cu4Ti intermetallic compound precipitation in a Cu matrix during aging. The Cu-3.5 wt% Ti(Cu-4.6 at% Ti) alloys without deformation and with uniform and non-uniform deformation were aged at 450 oC for various times after solution treatment at 885 oC. The uniformly and non-uniformly deformed alloys..... More

                           Cited By 7
Bridge Burst Characteristics of Aluminum and Copper Thin-Film Bridges in Electrical Initiation Devices
Kyoungjin Kim, Kyu-Hyoung Kim, Seung-gyo Jang
Korean J. Met. Mater. 2018;56(3):235-243.   Published online 2018 Mar 6
DOI: https://doi.org/10.3365/KJMM.2018.56.3.235

The optimal design of electrical initiation devices for explosive charges and other high energy materials critically depends on the bridge burst or the electrical explosion of the thin-film metallic bridges. It is therefore quite important to select the right material with suitable explosion properties for the metallic bridge film. However,..... More

Effect of the Number of Cold Rolling Passes on the Formation of {110}<001> Goss-Oriented Grains in Fe-3.2 wt% Si Electrical Steel
Fe-3.2 wt% Si 방향성 전기강판에서 냉간압연 횟수가 집합조직과 {110}<001> Goss 결정립 형성에 미치는 영향
Soeng-Ho Jeon, No-Jin Park
전성호, 박노진
Korean J. Met. Mater. 2018;56(2):130-136.   Published online 2018 Feb 5
DOI: https://doi.org/10.3365/KJMM.2018.56.2.130

An excellent grain-oriented electrical steel is composed of grains with exact Goss orientation. In order to produce this, it is important to control the Goss-oriented grains during the cold-rolling process. In this study, textures measured by X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) were analyzed for 1, 10, and..... More

Effect of Current Densities on the Electromigration Failure Mechanisms of Flip-Chip Sn-Ag Solder Bump
전류밀도에 따른 플립칩 Sn-Ag 솔더 범프의 Electromigration 손상기구 분석
Gahui Kim, Kirak Son, Gyu-Tae Park, Young-Bae Park
김가희, 손기락, 박규태, 박영배
Korean J. Met. Mater. 2017;55(11):798-805.   Published online 2017 Oct 31
DOI: https://doi.org/10.3365/KJMM.2017.55.11.798

The effect of current densities on the electromigration (EM) failure mechanism of flip chip Cu/Ni/Sn-Ag/Cu solder bumps was investigated under stressing conditions at current densities ranging from 5.0~6.9 × 103 A/cm2 at 150 ℃. The EM failure times at 5.0 × 103 A/cm2 were around 11 times longer than at..... More

         Cited By 1
Study of Solution-Processed Indium Zinc Oxide TFTs Made by Simultaneous Spin Coating and Ultraviolet Light Irradiation
스핀코팅과 자외선 조사의 동시 적용을 기반한 용액 공정형 Indium Zinc 산화물 트랜지스터 연구
Fei Shan, Sung-Jin Kim
선비, 김성진
Korean J. Met. Mater. 2017;55(8):572-575.   Published online 2017 Aug 1
DOI: https://doi.org/10.3365/KJMM.2017.55.8.572

We investigated solution-processed indium zinc oxide (IZO) thin-film transistors (TFTs) which were fabricated by spin coating with simultaneous irradiation by ultraviolet light. The proposed treatment enhanced the efficient condensation and densification of the oxide semiconducting channel layer by decreasing oxygen-vacancy-related defects and increasing metal-oxide bonds. An IZO TFT irradiated for..... More

Correlation Between Electrical Conductivity and Catalytic Property in 78V<sub>2</sub>O<sub>5</sub>-15P<sub>2</sub>O<sub>5</sub>-7B<sub>2</sub>O<sub>3</sub> Glass Containing Fe<sub>2</sub>O<sub>3</sub>
Fe2O3를 포함한 78V2O5-15P2O5-7B2O3계 유리의 결정화에 따른 전기전도도와 촉매특성의 상관관계
Hwa-Jin Jeong, Jong-hwan Kim, Bong-Ki Ryu
정화진, 김종환, 류봉기
Korean J. Met. Mater. 2016;54(12):931-936.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.931

In this study, we established a correlation between the electrical conductivity and catalytic properties of vanadium borophosphate glass containing Fe2O3. Glasses were synthesized in the 78V2O5–15P2O5–7B2O3 ternary-system containing x mol% Fe2O3 (x = 1, 5, 7.5, and 10). Electrical conductivity was measured at 45 ℃ for samples heat-treated at 340..... More

Fabrication of Si/SiO<sub>x</sub> Anode Materials by a Solution Reaction-Based Method for Lithium Ion Batteries
Hyeon-Woo Yang, Jung-Ho Lee, Sang-Chul Jung, Seung-Taek Myung, Woo-Seung Kang, Sun-Jae Kim
Korean J. Met. Mater. 2016;54(10):780-786.   Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.780

Si/SiOx composite anodes were prepared using a facile solution reaction-based method. Their initial capacity was significantly improved to 1.3 times that of SiOx by incorporating 3 wt% silicon nanoparticles into the SiOx. The capacity retention of the Si/SiOx anodes after 50 charge-discharge cycles was significantly enhanced, to 99%, compared with..... More

         Cited By 4
Effect of Post-Deposition Annealing on the Structural, Optical and Electrical Properties of Ti-doped Indium Oxide Thin Films
Sung-Bo Heo, Hyun-Joo Moon, Jeong-Hyeon Oh, Young-Hwan Song, Tae-Young Eom, Jun-Ho Kim, Daeil Kim
Korean J. Met. Mater. 2016;54(10):775-779.   Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.775

Ti-doped In2O3 (TIO) thin films were deposited on glass substrates by RF magnetron sputtering. The films were then annealed at 100, 200 or 300 °C for 30 min to investigate the effects of the annealing temperature on the films’ structural, electrical and optical properties. The films annealed at 200 °C..... More

         Cited By 1
Electronic Materials
Enhanced Optical and Electrical Properties of TiO<sub>2</sub> Buffered IGZO/TiO<sub>2</sub> Bi-Layered Films
Hyun-Joo Moon, Daeil Kim
Korean J. Met. Mater. 2016;54(8):605-608.   Published online 2016 Aug 5
DOI: https://doi.org/10.3365/KJMM.2016.54.8.605

In and Ga doped ZnO (IGZO, 100-nm thick) thin films were deposited by radio frequency magnetron sputtering without intentional substrate heating on a bare glass substrate and a TiO2-deposited glass substrate to determine the effect of the thickness of a thin TiO2 buffer layer on the structural, optical, and electrical..... More

         Cited By 1
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