Review
Materials Science, Multidisciplinary
Jiaqian Li, Xing Han, Wei Li, Ling Yang, Xing Li, Liqiu Wang
Summary: This review discusses the role of reentrant features on surface and introduces design principles inspired by insects and plants. By quantitatively associating microscopic structural parameters with macroscopically visible wetting and adhesion properties, it evaluates how the design of reentrant features can enable exceptional superomniphobicity, strong adaptive adhesion, and directional fluidic navigation. The article also presents advanced manufacturing technologies for the realization of reentrant surfaces, potential applications, and scientific and technological challenges and opportunities.
PROGRESS IN MATERIALS SCIENCE
(2023)
Review
Chemistry, Physical
Saba Goharshenas Moghadam, Hamidreza Parsimehr, Ali Ehsani
Summary: Surface wetting significantly influences material performance and applications, with superhydrophobic surfaces exhibiting water repellency due to their low surface energy chemistry and micro/nanostructure roughness. The next generation of superhydrophobic surfaces, Multifunctional SHSs, are rapidly evolving with properties including self-healing, anti-bacterial, anti-fouling, and stimuli responsiveness. Designing durable Multifunctional SHSs with self-healing functions can enhance performance and lifespan, with a focus on parameters such as durability, stability, more functions, responsiveness, and environmentally friendly features.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2021)
Article
Physics, Multidisciplinary
D. M. Kazantsev, I. O. Akhundov, A. S. Kozhuhov, V. S. Khoroshilov, N. L. Shwartz, V. L. Alperovich, A. Latyshev
Summary: We present the results of GaAs annealing experiments in the conditions near equilibrium, which clarify the reasons of the transition from surface smoothing to roughening at temperatures above 650 degrees C. The roughening is due to kinetic instabilities arising under deviation of annealing conditions towards growth or sublimation. These instabilities reveal themselves in appearing islands (for sublimation) and pits (for growth) of multilayer heights and depths, respectively. The islands and pits appear due to the motion of atomic steps through surface spots, at which sublimation and growth are suppressed. Pinning of the steps at these spots also lead to step bunching at surfaces with sufficiently small terrace widths. This explanation is consistent with Monte Carlo simulations of atomic processes on the GaAs surface. The similarity and distinctions in surface roughening under sublimation and growth, along with the role of Schwobel barrier, are discussed. Annealing experiments in the cavities, which are formed by GaAs substrates with well-controlled atomic step densities enabled us to clarify the roughening mechanisms and to improve the efficiency of GaAs thermal smoothing technique by increasing smoothing temperature up to 775 degrees C.
Article
Chemistry, Multidisciplinary
Marcel J. J. Rost, Leon Jacobse, Marc T. M. Koper
Summary: By analyzing the distribution of nuclei-distance, it is found that a rare and non-random nucleation process occurs in chemical surface systems. This process involves the formation of special, preferential nucleation sites via a precursor, eventually leading to a semi-ordered Pt-oxide structure. This precursor mechanism may also explain the formation of nano-islands on other surfaces/reactions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Shan Gao, Jian Qu, Zhichun Liu, Wei Liu
Summary: In this study, nanoscale thin-film boiling on different surfaces was simulated, and it was found that the heat transfer performance of boiling depends on the surface properties. Rough structures improve the efficiency of boiling, while hydrophobic surfaces lead to heat transfer deterioration. The underlying mechanism is attributed to the variation of interfacial thermal resistance.
Article
Thermodynamics
Haixiang Zhang, Xiwen Zhang, Feng He, Cunjing Lv, Pengfei Hao
Summary: Superhydrophobic surfaces have been widely studied for anti-icing applications. This work investigates the impact of supercooled drops on surfaces with different micropatterns and reveals the dynamic freezing modes and their phase diagrams. Hierarchical SHSs show better anti-icing performances than single-tier SHSs, and capillary evacuation plays a significant role in reducing contact time and area.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Environmental
S. Keshavarzi, A. Entezari, K. Maghsoudi, G. Momen, R. Jafari
Summary: This study investigates ice nucleation time on superhydrophobic surfaces using both experimental testing and machine learning approaches. The experimental results show that superhydrophobic surfaces with higher roughness parameters have longer ice nucleation times. The predicted ice nucleation time from the machine learning model agrees well with the experimental outcomes. The study also determines the relative importance of different parameters in determining surface icephobicity.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
M. Besse, G. Fausti, M. E. Cates, B. Delamotte, C. Nardini
Summary: Interfaces of phase-separated systems roughen in time due to capillary waves and their dynamics is nonlocal in real space. We introduce a new universality class named IqIKPZ to describe the phase-separated interface in the absence of detailed balance. The associated scaling exponents are computed using one-loop renormalization group and verified through numerical integration of the IqIKPZ equation. We argue that the IqIKPZ universality class generically describes liquid-vapor interfaces in two-and three-dimensional active systems.
PHYSICAL REVIEW LETTERS
(2023)
Article
Engineering, Chemical
Qiyuan Deng, Hong Wang, Zhenting Xie, Xin Zhou, Ye Tian, Qian Zhang, Xun Zhu, Rong Chen, Qiang Liao
Summary: This study visually investigates the dynamic behavior of droplet impact and freezing process on a subcooled superhydrophobic surface under an electric field. The research analyzes the influence of surface temperature and electric field strength on various parameters. The results demonstrate that an increase in electric field strength and a decrease in surface temperature lead to an exponential increase in nucleation rate. This study provides guidance for anti-icing design in power grid systems.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Thermodynamics
Xilin Wang, Lu Liu, Chen Yang, Xinyu Dong, Xueming Yang
Summary: This study investigated the boiling of argon liquid films on heated solid metal copper and heated liquid metal gallium surfaces using molecular dynamics simulation. The effects of liquid film thickness and surface flexibility on boiling were analyzed. The results showed that a thinner liquid film could provide sufficient vaporization energy and promote rapid vaporization, while vapor cavity growth would tear the liquid film, enhancing boiling heat transfer. Comparatively, the generation and departure of vapor cavities on the surface of liquid metal increased surface fluctuation, facilitating heat transfer and leading to more intense boiling. This study contributes to the understanding of the microscopic mechanism of boiling heat transfer on liquid metal surfaces and provides insights for industrial applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Mechanical
A. Jawaid, J. Seewig
Summary: Surface roughness is important in fluid dynamics and contact mechanics, and its evaluation often requires real-world or numerical experiments. This paper proposes a novel approach to simulate rough surfaces using Gaussian processes (GPs) and a noise model, allowing for a wider range of simulations compared to traditional methods. The paper introduces the theoretical similarities between GPs and auto-regressive moving-average processes, and demonstrates the use of the proposed method in modeling turned profiles and inherently periodic surfaces.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2023)
Article
Thermodynamics
Pengfei Liu, Ranjith Kandasamy, Jin Yao Ho, Jinlong Xie, Teck Neng Wong
Summary: The experimental study shows that increasing surface roughness can enhance spray cooling heat transfer, with an accuracy of 15% for empirical correlation on structured flat surfaces. There exists a decoupling relationship between micro-roughness and macro-structure enhancing mechanisms, with different impacts on surfaces with different structures.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Xianqiang Deng, Xiaoxiao Xu, Xiang Song, Qibin Li, Chao Liu
Summary: This paper employs molecular dynamics (MD) simulations to study the influence of lubricant (PEC4) on the boiling heat transfer of CO2 on the structured surface. The results indicate that the structured surface enhances the nucleation boiling of CO2 by providing effective nucleation sites and larger heat transfer areas. However, when the mass fraction of PEC4 is increased, the efficiency of nucleation boiling heat transfer decreases on the structured surface. The presence of PEC4 molecules hinders the movement and phase transition of CO2 molecules, leading to an increase in nucleation temperature and a decrease in heat transfer performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Materials Science, Coatings & Films
Xixi Wang, Zi Ming Wang
Summary: The lubricant/oil-impregnated surface has been extensively studied for its versatile functionality in service environments, but its failure caused by water droplets is still not well understood. In this study, we investigated the evaporation/crystallization of droplets on oil-impregnated and oil-coated steel surfaces, and found that micro-scale interfacial actions play a crucial role in droplet behavior and failure. Our findings have significant implications for understanding droplet behavior on engineering materials surfaces.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Jinwoo Kim, Dylan Hall, Haoxue Yan, Yitong Shi, Sudha Joseph, Sarah Fearn, Richard J. Chater, David Dye, C. Cem Tasan
Summary: It was found that roughening the surface of Ti-6Al-4V can significantly reduce hydrogen uptake and enhance its resistance against hydrogen embrittlement.
Review
Materials Science, Multidisciplinary
Joe Elambasseril, Jason Rogers, Chris Wallbrink, David Munk, Martin Leary, M. Qian
Summary: The design freedom offered by additive manufacturing (AM) enables the fabrication of components with internal surfaces that are challenging to access post-manufacture. This is of concern, as the surface condition can markedly deteriorate fatigue performance. It is therefore desirable to consider deploying AM parts with no or minimal surface processing for targeted applications.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2023)
Article
Automation & Control Systems
David Downing, Jason Rogers, Rance Tino, Joe Elambasseril, Chris Wallbrink, Ma Qian, Milan Brandt, Martin Leary
Summary: Surface roughness of complex additive manufactured lattice structures is difficult to evaluate with traditional methods. Computed tomography (CT) provides qualitative insight but does not directly yield roughness profile data. This research proposes a hybrid approach that uses mathematical reconstruction and interpretation of CT data to quantify roughness profile data for lattice structures. The method is verified and found to be minimally influenced by CT reconstruction thresholding, providing certainty for its industrial application. This method accurately characterizes the surface roughness and supports subsequent certification analysis.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Q. Zhou, X. Z. Zhang, H. P. Tang, M. Qian
Summary: Ti-1Al-8V-5Fe alloy was fabricated using electron beam powder bed fusion. No Fe-stabilized beta-flecks were observed. In-situ precipitation hardening occurred in columnar prior-beta grains. Nanoscale alpha-lath precipitates exhibited noticeable deformation while microscale alpha-laths became a major source of microcracks, which should be avoided. The as-fabricated Ti-1Al-8V-5Fe alloy showed significant tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Multidisciplinary Sciences
Tingting Song, Zibin Chen, Xiangyuan Cui, Shenglu Lu, Hansheng Chen, Hao Wang, Tony Dong, Bailiang Qin, Kang Cheung Chan, Milan Brandt, Xiaozhou Liao, Simon P. P. Ringer, Ma Qian
Summary: This study demonstrates a series of titanium-oxygen-iron compositions with outstanding tensile properties, achieved through alloy design and additive manufacturing. These alloys, strengthened by the abundant elements of oxygen and iron, offer potential for diverse applications and the industrial-scale use of waste sponge titanium. Additionally, they have significant economic and environmental potential for reducing the carbon footprint of energy-intensive sponge titanium production.
Review
Materials Science, Multidisciplinary
Majid Laleh, Esmaeil Sadeghi, Reynier Revilla, Qi Chao, Nima Haghdadi, Anthony E. Hughes, Wei Xu, Iris De Graeve, Ma Qian, Ian Gibson, Mike Y. Tan
Summary: Metal additive manufacturing (AM) is a process of making 3D metal parts layer by layer through the interaction between a heating source and feeding material from a digital design model. Post-AM heat treatment is needed to modify microstructure and alleviate residual stresses for achieving comparable or superior properties to conventionally manufactured counterparts. This review discusses the influence of heat treatment on microstructure, mechanical properties, and corrosion behavior of major categories of AM metals, highlighting the significant differences between AM metals and their conventionally manufactured counterparts.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Siyu Lu, Shenglu Lu, Biao Chen, Ma Qian, Qiuming Wei, Katsuyoshi Kondoh, Jianghua Shen
Summary: In this study, in-situ high temperature electron back-scatter diffraction (HT-EBSD) was used to investigate the phase transformation in Grade 1 commercially pure titanium (CP Ti). The results showed that the transformation from alpha-Ti to beta-Ti followed the Burgers orientation relationship (BOR), while the transformation from beta-Ti to alpha-Ti during continuous cooling led to the formation of Type 2 alpha-variants that defied the BOR. This phenomenon, not reported before for CP Ti, was attributed to the fast cooling process and the lattice mismatch between the two phases.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
H. Z. Zhong, T. Song, C. W. Li, R. Das, J. F. Gu, M. Qian
Summary: Intricate hollow-strut metal lattice materials, enabled by additive manufacturing, exhibit superior strength and stiffness compared to their solid-strut counterparts of the same density. Analyzed using various models, it is revealed that the hollow-strut lattice structures provide higher resistance to bending, resulting in increased mechanical properties. These materials offer lightweight design options with improved performance at the same or lower density than solid-strut metal lattices.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Manufacturing
J. Noronha, J. Rogers, M. Leary, E. Kyriakou, S. B. Inverarity, R. Das, M. Brandt, M. Qian
Summary: In this study, hollow-strut metal lattices were successfully fabricated using laser powder bed fusion (LPBF) additive manufacturing (AM). It was found that both face-centered cubic (FCC) and FCC with Z-struts (FCCZ) Ti-6Al-4V lattice topologies exhibited mechanical properties close to solid-strut metal lattices. Moreover, the fine prior-beta grains in the Ti-6Al-4V hollow-strut thin walls contributed positively to the superior mechanical properties.
ADDITIVE MANUFACTURING
(2023)
Article
Nanoscience & Nanotechnology
J. Noronha, J. Dash, M. Leary, D. Downing, E. Kyriakou, M. Brandt, M. Qian
Summary: This study presents a design strategy to improve the strength of hollow-strut metal lattices by applying nodal reinforcement. The proposed designs significantly increased the yield strength and elastic modulus of Ti-6Al-4V cubic lattices, while still maintaining a modest increase in density. Compared to solid-strut Ti-6Al-4V cubic lattices, the reinforced lattices exhibited higher peak stress and exceeded the upper limits of the Gibson-Ashby model for cellular metallic materials.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Abdollah Bahador, Astuty Amrin, Shota Kariya, Ammarueda Issariyapat, Ozkan Gokcekaya, Guohua Zhao, Junko Umeda, Yafeng Yang, Ma Qian, Katsuyoshi Kondoh
Summary: This research investigates the effect of adding rhenium (Re) on the microstructure and strengthening mechanisms in titanium alloys. The results demonstrate that Re addition can significantly enhance the strength and ductility of titanium alloys, providing valuable insights for the development of high-performance structural materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Meeting Abstract
Chemistry, Physical
Yu-heng Lu, You-chen Tang, Ke-han Tang, Ding-cai Wu, Ma Qian
Article
Materials Science, Multidisciplinary
Zefeng Wu, Patrick O'Toole, Christian Hagenlocher, Ma Qian, Milan Brandt, Jarrod Watts
Summary: This study used a specialized welding camera to observe the interactions between the laser, powder stream, and substrate surface in HSL-DED. The observations revealed a physical separation between the laser spot and the melt pool boundary, referred to as melt pool lag. The chemical compositions and thermophysical properties of different substrates significantly impact the melt pool dynamics during high-speed laser-material interactions.
JOURNAL OF LASER APPLICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Q. Zhou, X. Z. Zhang, T. Song, S. L. Lu, T. Dong, H. P. Tang, M. Qian
Summary: In this study, the fabrication of Ti-1Al-8V-5Fe (Ti-185) alloy using laser directed energy deposition (L-DED) was investigated. The precipitate phases along the build height were found to have a significant influence on the tensile properties of the alloy. The formation of the embrittling isothermal omega-phase (omega iso) was found to result in zero plasticity in the top region of the sample, while the middle region without the omega-phase exhibited significant tensile ductility and strength. Furthermore, it was demonstrated that converting the isothermal omega-phase to the athermal omega-phase (omega ath) restored the tensile ductility of the alloy.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
S. L. Lu, D. Han, D. Y. Qin, T. Song, D. Qiu, M. Brandt, H. P. Tang, M. Qian
Summary: Massive transformations occur in titanium alloys, resulting in patch-like massive phases that traverse the parent prior-beta grain boundaries. The formation of these phases always occurs when two neighboring prior-beta grains share or nearly share a {110} pole. These phases display concentrated {0001} poles and tend to decompose into ultrafine alpha-beta lamellae.
SCRIPTA MATERIALIA
(2024)
Article
Multidisciplinary Sciences
H. Z. Zhong, C. W. Li, R. Das, J. F. Gu, M. Qian
Summary: Post-yield softening (PYS) is an important factor in guiding the design of high-performance energy-absorbing lattice materials. Contrary to previous assumptions, this study shows that PYS can occur in bending-dominated Ti-6Al-4V lattices with increasing relative density. The underlying mechanism is explained by the increase in stretching and shear deformation as relative density increases, leading to a higher tendency towards PYS. This finding expands perspectives on PYS for the design of high-performance energy-absorbing lattice materials.
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)