Article
Materials Science, Ceramics
Jorge Luis Vazquez-Arce, Le Thu Lam, Cesar Lopez-Mercado, Gerardo Soto, Hugo Tiznado
Summary: This work demonstrates the use of chronoamperometry as a valuable tool for determining diffusivities in all-solid-state nanometer-thick cells. The transient current in electrochemical cells under constant voltage is described using RC circuit equations for purely capacitive processes and Cottrell's equations for purely diffusive processes. The study focuses on Metal/Insulator/Metal nano-cells with Ru and Au electrodes and YSZ electrolyte, and shows that the diffusive and capacitive contributions at different temperatures follow the Arrhenius law. The analysis also explores other parameters such as capacitance, effective concentration, and leakage current, and compares experimental diffusivity values with those obtained by the statistical moment method.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Sung Il Park, Byung Chan Yang, Jihyun Kim, Jaeyoon Ko, Gyung-Min Choi, Jihwan An, Jungwan Cho
Summary: Yttria-stabilized zirconia (YSZ) doped with yttrium has been widely used in electronic and energy devices. In this study, we report the thermal conductivity of YSZ thin films with varying Y2O3 content deposited by plasma-enhanced atomic layer deposition (PEALD). The results show that the thermal conductivity decreases with increasing Y2O3 doping concentration, mainly due to increased phonon scattering by oxygen vacancies. Our PEALD YSZ films have higher thermal conductivities compared to previously reported films, possibly due to their relatively larger grain sizes.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Rebecca J. O'Toole, Bola Yoon, Christopher J. Gump, Rishi Raj, Alan W. Weimer
Summary: The addition of nanoscale Al2O3 films to 8YSZ powders during flash sintering enhances grain growth, changes the conductivity of the starting powder, and effectively alters the flash onset temperature.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
J. L. Vazquez-Arce, H. Tiznado, R. Kirchheim
Summary: Electrochemical cells fabricated on a silicon wafer demonstrate stable currents and open circuit voltage. The existence of virtual electrodes and unreacted material contributes to the generation of steady currents through reactions with the electrodes and internal reactions within the electrolyte. The calculated time to reach a steady state is inversely proportional to the incubation time, the second power of electric field strength, and the diffusion coefficient of oxygen vacancies.
Article
Materials Science, Ceramics
Chia-Hsun Hsu, Zhi-Xuan Zhang, Pao-Hsun Huang, Wan-Yu Wu, Sin-Liang Ou, Shui-Yang Lien, Chien-Jung Huang, Ming-Kwei Lee, Wen-Zhang Zhu
Summary: In this study, SnO2 films were prepared using PEALD with TDMA-Sn as the metal source and O-2/Ar mixture as the oxidant. It was found that plasma power significantly influences the properties of the SnO2 films, with 1500 W being the optimal power. Lower and higher powers result in unwanted Sn3O4 formation and reduced film quality.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Batuhan Bal, Aligul Buyukaksoy
Summary: The study focuses on using yttria doped bismuth oxide ceramics as electrolyte supports and applying zirconia coatings to prevent reduction upon contact with hydrogen. However, the reaction between Zr source and YDB substrate as well as the choice of polymerization extent play crucial roles in crack formation and film conductivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Ceramics
Juan Luis Pantoja-Pertegal, Antonio Diaz-Parralejo, Antonio Macias-Garcia, J. Sanchez-Gonzalez, Eduardo M. Cuerda-Correa
Summary: This work focuses on the design, preparation, and characterization of YSZ coatings using the EPD technique. The study optimized the electrophoretic characteristics of YSZ suspensions, analyzed the correlation between experimental results and theoretical values, and achieved optimal coating results by thermal treatment of stainless steel substrates.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Xianbing Ming, Zekun Wang, Yi Zhang
Summary: This study investigates the waveguide effect in yttria-stabilized zirconia crystal irradiated by energetic oxygen ions. The results show that the light beam can be well confined in the waveguide structure, exhibiting a refractive index distribution of the barrier-wall and enhanced-well type. The lattice damage induced by irradiation is examined using Rutherford backscattering/channeling experiment and high-resolution X-ray diffraction techniques, with simulation results aligning well with experimental data.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Ceramics
Siyao Li, Shoulei Xu, Xiangyu Wang, Daini Wang, Bernard A. Goodman, Xing Hong, Wen Deng
Summary: Cubic zirconia single crystals stabilized with yttria and doped with Gd2O3 were prepared and characterized using various spectroscopic techniques. The absorption and emission spectra showed distinct peaks, with peak intensities changing with varying Gd3+ concentrations. The quenching effect observed in the emission spectra is attributed to dipole-dipole interactions, and supported by the broadening of Gd3+ EPR spectra with increasing concentration.
CERAMICS INTERNATIONAL
(2021)
Article
Electrochemistry
D. A. Agarkov, M. A. Borik, G. M. Korableva, A. V. Kulebyakin, B. E. Komarov, I. E. Kuritsyna, E. E. Lomonova, F. O. Milovich, V. A. Myzina, V. A. Pankratov, N. Y. Tabachkova, D. M. Zakharov
Summary: (ZrO2)(1 - x -) (y)(Y2O3)(x)(CeO2)(y) solid solution crystals were grown by skull melting technique. The effects of CeO2 addition on the crystal structure and high-temperature conductivity of the crystals were investigated. Ce cations in crystals were mainly Ce4+ ions according to X-ray absorption near-edge structure spectroscopy. The grown crystals were single-phase and had either a tetragonal or cubic structure, with the latter containing 10 mol% Y2O3 and doped with CeO2. Doping with CeO2 resulted in a linear increase in lattice parameter, indicating the formation of a solid solution.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Materials Science, Ceramics
Shen J. Dillon, Yu-Feng Shen, Gregory S. Rohrer
Summary: By investigating the variation of grain boundary energy, the characteristics of grain boundaries in 8% yttria-stabilized zirconia were identified, with a focus on the impact of [100] orientation and [100] twist boundaries. The study results indicate that by manipulating the microstructure to increase the relative areas of [100] twist boundaries, the oxygen ion conductivity of the material can be enhanced.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Lauri Aarik, Karmo Peetermann, Laurits Puust, Hugo Mandar, Arvo Kikas, Ilmo Sildos, Jaan Aarik
Summary: Atomic layer deposition of praseodymium oxide films allows for uniform doping of HfO2 films with non-uniform thicknesses. The absorption of oxygen in PrOx-rich material enhances ALD growth, leading to thickness gradients in thicker films. Pr-doping stabilizes the tetragonal form and improves photoluminescence efficiencies in HfO2 films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yanhao Dong, Yimeng Huang, Dong Ding, Wei Wu, Xiahui Yao, Ju Li
Summary: This study uses first-principles calculations to illustrate the chemical nature and local structural features of hole states in oxidized YSZ, identifying three types of hole states. The implications of these findings on various experimental observations are discussed, shedding light on the understanding of electronic conductivity and hole carriers in YSZ.
Article
Materials Science, Ceramics
Lukas Theis, Frank Kern
Summary: Partially stabilized zirconia ceramics with different gadolinia content were prepared by co-milling, spray granulation, axial pressing, and pressureless sintering. The redistribution of stabilizers at high sintering temperatures was observed by XRD. Substituting gadolinia for yttria reduced the stabilizer content in the tetragonal phase and increased the tetragonality, transformability, and toughness of the materials, while decreasing the hardness. The cubic content increased with increasing gadolinia content, as predicted by thermodynamic considerations.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
J. L. Vazquez-Arce, O. Romo, F. Solorio, C. A. Lopez-Mercado, John Read, D. Dominguez, O. E. Contreras, G. Soto, H. Tiznado
Summary: This research introduces a thin-film supercapacitor based on materials manufacturing technologies, which can meet new electronic challenges and improve energy density and performance under extreme operating conditions. By adjusting thickness and temperature, the key to improving energy density lies in activating ionic conduction in the electrolyte.
JOURNAL OF POWER SOURCES
(2022)
Article
Nanoscience & Nanotechnology
Dai-Hong Kim, Won-Sik Kim, Sungtae Kim, Seong-Hyeon Hong
ACS APPLIED MATERIALS & INTERFACES
(2014)
Article
Chemistry, Physical
So-Yeon Lee, Kyung-Tae Jang, Min-Woo Jeong, Sungtae Kim, Hwanyeol Park, Kuntae Kim, Gun-Do Lee, Miyoung Kim, Young-Chang Joo
Article
Engineering, Electrical & Electronic
Cheol Kim, Kirak Son, Gahui Kim, Sungtae Kim, Sol-Kyu Lee, So-Yeon Lee, Young-Bae Park, Young-Chang Joo
Summary: With the reduction of process node size, issues such as Cu diffusion and high leakage currents under high electric fields have become more prominent. This study found that the interfacial adhesion energy between low-k materials and capping layers is influenced by factors such as stacking order of low-k layers and the presence of Si-C bonds, with the O-rich layer significantly improving the interfacial adhesion energy in dielectric/capping layers.
MICROELECTRONICS RELIABILITY
(2021)
Article
Microscopy
Jinseok Ryu, Hyeohn Kim, Ryeong Myeong Kim, Sungtae Kim, Jaeyeon Jo, Sangmin Lee, Ki Tae Nam, Young-Chang Joo, Gyu-Chul Yi, Jaejin Lee, Miyoung Kim
Summary: A novel combination of machine learning algorithms is proposed for differentiation of distinct spectra in a large electron energy loss spectroscopy spectrum image dataset. By utilizing dimensionality reduction and clustering techniques, specific spectra with fine structures were successfully differentiated.
Article
Physics, Applied
Jinseok Ryu, Sangmin Lee, Sungtae Kim, Young-Chang Joo, Miyoung Kim
Summary: Researchers conducted a comprehensive analysis of the atomic and electronic structures of amorphous carbon using techniques such as 4D-STEM and STEM-EELS. By applying data processing methods, they were able to extract information on the atomic structures and their spatial distributions, enabling further study on the impact of different elements on bond length and the types of nano-crystals present.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Sungtae Kim, Min-Woo Jeong, Kuntae Kim, Ung-gi Kim, Miyoung Kim, So-Yeon Lee, Young-Chang Joo
Summary: The importance of developing a hardmask with excellent performance and physical and chemical properties for long-term etching in high-density semiconductors is highlighted. Amorphous carbon hardmasks doped with different concentrations of nitrogen were fabricated, and their properties were analyzed using various techniques. It was found that increasing the nitrogen concentration in the film decreased the selectivity of the doped amorphous carbon films but reduced the penetration depth of fluorine ions during etching. To develop an excellent hardmask, it is crucial to increase the film density, nitrogen concentration, and the ratio of graphitic nitrogen to pyrrolic nitrogen.
Article
Chemistry, Physical
Sungtae Kim, Ung-gi Kim, Jinseok Ryu, Dokyun Kim, Miyoung Kim, Young-Chang Joo, So-Yeon Lee
Summary: Boron-doped amorphous carbon (a-C) films were deposited using DC magnetron sputtering with varying boron concentrations for semiconductor integration. An increase in boron doping concentration resulted in higher etch resistance but also a gradation of etch resistivity in the depth direction of the film. The study demonstrated the potential of boron-doped a-C films as a hardmask material for the semiconductor industry.
APPLIED SURFACE SCIENCE
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Cheol Kim, Min-Woo Jeong, Sungtae Kim, Seung-Hyun Oh, So-Yeon Lee, Young-Chang Joo, Haishan Shen, Hoojeong Lee, Jeonglim Yoon, Youngcheol Joo
2020 IEEE 70TH ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE (ECTC 2020)
(2020)
Article
Crystallography
Jianzheng Hu, Long Yan, Ning Zhou, Yao Chen, Xiaoni Yang, Lianqiao Yang, Shiping Guo
Summary: The effect and mechanism of carrier gas velocity, V/III ratio, and carrier gas velocity match on the growth rate of AlN were investigated in this study. The results showed that the growth rate of AlN initially increased with hydrogen flow rate, reached saturation, and then decreased monotonically. The turning point value depended on the equipment and process. By increasing the MO VM, the growth rate of AlN could be improved, but the uniformity deteriorated due to turbulence and loss of uniform boundary layer. High quality AlN films were successfully grown on nano-patterned sapphire substrates with improved crystalline quality and atomic smooth surfaces.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Tingting Ma, Yang Li, Kangning Sun, Qinglin Cheng, Sen Li
Summary: This study investigates the melting process and nucleation behavior of sodium crystals using molecular dynamics simulation. The results show good agreement between simulated and experimental values for the melting temperature, density, and radial distribution function of sodium. The diffusion coefficient of liquid sodium increases linearly with temperature, and the homogeneous nucleation rate of melting in superheated sodium crystal exponentially increases with temperature. The findings provide theoretical support for applications involving heat and mass transfer in sodium-related systems.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Hisato Nishii, Shintarou Iida, Akira Yamasaki, Takumi Ikenoue, Masao Miyake, Toshiya Doi, Tetsuji Hirato
Summary: Epitaxial V2O3 films were fabricated on sapphire substrates using mist chemical vapor deposition (mist CVD) method, eliminating the need for high vacuum conditions. The films can be grown on sapphire substrates even under atmospheric pressure, with the optimal growth temperature at 823 K. The films grown at 823 K exhibit a metal-insulator transition at approximately 155 K. The film on C-plane sapphire exhibits a lower transition temperature compared to those on R- and A-plane sapphire substrates.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Jani Jesenovec, Kevin Zawilski, Peter Alison, Stephan J. Meschter, Sambit K. Saha, Andrew J. Sepelak, Peter G. Schunemann
Summary: In this study, NiSb needles were successfully formed in InSb by manipulating the growth rate and adding NiSb. These needle structures in InSb can be used to tune the magnetoresistance of devices. Additionally, undoped InSb crystals demonstrated good infrared transmission at low growth rates.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
D. Joseph Daniel, P. Karuppasamy, H. J. Kim
Summary: The 2-amino 4-methyl pyridinium oxalate (2A4MPO) compound was synthesized and its crystal structure, functional groups, thermal stability, electrical properties, and third-order nonlinear optical properties were studied. The results demonstrate that the synthesized crystal has good structural integrity, thermal stability, and potential for third-order nonlinear optical applications.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
C. W. Lan
Summary: The past two decades have witnessed a significant transformation in solar silicon crystal growth, especially in the competition between multi-crystalline silicon (Multi-Si) and mono-crystalline silicon (Mono-Si). The demand for this crucial material has exponentially surged, with silicon solar panels capturing over 95% of the global PV market share. The advancements in crystal growth technology during this period have set historical benchmarks, with the market share shifting from high-performance multi-crystalline silicon (HPM-Si) to CZ silicon.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Peiyao Hao, Lili Zheng, Hui Zhang
Summary: A novel design of argon gas tube for removing impurities during silicon ingot growth was developed, and numerical simulations showed that it can effectively extract SiO.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Geetika Sahu, Chanchal Chakraborty, Subhadeep Roy, Souri Banerjee
Summary: This article discusses the novel fractal nature of hydrothermally synthesized MoS2 QDs. By adjusting the reaction time, the study found that the average size of QDs increases and then decreases with longer reaction times. STEM images indicate that shorter reaction times lead to sheet formation, while extended reaction times cause sheets to fragment into QDs.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Pengjian Lu, Wei Huang, Junjun Wang, Haitao Yang, Shiyue Guo, Bin Li, Ting Wang, Chitengfei Zhang, Rong Tu, Song Zhang
Summary: A systematic study on the tetramethylsilane-hydorgen (TMS-H-2) system for the deposition of pure single-crystal SiC by high-temperature chemical vapor deposition (HTCVD) method is conducted. The study investigates the effect of temperature, pressure, and H-2:TMS ratio on the deposition conditions and provides a theoretical basis and guidance for improving the quality and cost of industrial production of single-crystal SiC.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Xinyu Jiang, Liangliang Liu, Yanqing Liu, Yan Wang, Zhaoping Hou
Summary: Investigation on the preparation of anisometric templated textured high entropy or multi-element doped ferroelectric ceramics was conducted using A-site disordered niobate microcrystals. The effects of process parameters on the morphology and chemical composition were studied, and the photocatalytic properties of the microcrystals were evaluated.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Mobashsara Tabassum, Md. Ashraful Alam, Sabrina Mostofa, Raton Kumar Bishwas, Debasish Sarkar, Shirin Akter Jahan
Summary: In this study, high crystallinity copper nanoparticles were synthesized by altering the reaction medium at low temperatures. The results show that changing the reaction medium can reduce the surface energy of precursors and promote the formation of highly crystalline copper nanoparticles.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Ivan Bodnar, Vitaly V. Khoroshko, Veronika A. Yashchuk, Valery F. Gremenok, Mohsin Kazi, Mayeen U. Khandaker, Tatiana I. Zubar, Daria I. Tishkevich, Alex Trukhanov, Sergei Trukhanov
Summary: This work presents the production of single crystals of Cu2ZnGeSe4, a semiconducting quaternary compound, using a gas chemical method with iodine as a transporter. The phase state, crystal structure, and lattice constants of the synthesized samples were refined and determined. The band gap of Cu2ZnGeSe4 was calculated using transmission spectrum and it was found that the band gap increases by 12% with decreasing temperature in the range of 20-300 K.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Timur Malin, Igor Osinnykh, Vladimir Mansurov, Dmitriy Protasov, Sergey Ponomarev, Denis Milakhin, Konstantin Zhuravlev
Summary: The effect of growth temperature on the buffer leakage currents of GaN-on-Si layers was investigated. It was found that higher growth temperature results in lower leakage currents. The defects in GaN layers grown at different temperatures were studied using photoluminescence technique, and a correlation between leakage currents, structural perfection, and donor concentration in GaN-on-Si layers was established. It was also observed that reduced growth temperature leads to the formation of inversion domains.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Thi-Hoai-Thu Nguyen, Jyh-Chen Chen
Summary: The effect of heater power control on heat, flow, and oxygen transport for CCz crystal growth was studied. Shorter upper side heater design could improve crystal quality and growth, but with higher power consumption.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Peter Rudolph
Summary: This article presents an overview of selected contributions to the development of crystal growth technology by the Laudise Prize awardee 2023. It discusses various aspects such as shaped crystal growth, the correlation between melt structure and crystal quality, control of intrinsic defects and inclusions, prevention of dislocation cell patterns, and melt growth experiments under a travelling magnetic field.
JOURNAL OF CRYSTAL GROWTH
(2024)