Article
Engineering, Electrical & Electronic
Soyoon Kim, Jungbok Lee, Hyungsoo Ahn, Kyounghwa Kim, Min Yang
Summary: Ga2O3 thin films were hetero-epitaxially grown on 4H-SiC substrates using MOCVD. The crystal quality of the epsilon-Ga2O3 thin films grown on Si-face and C-face of 4H-SiC substrates was compared. Results showed that the epsilon-Ga2O3 film grown on a Si-face substrate exhibited better crystal quality compared to growth on a C-face. Annealing the epsilon-Ga2O3 thin film in an oxygen atmosphere transformed the crystal phase and significantly reduced the roughness.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Joseph M. Monti, James A. Stewart, Joyce O. Custer, David P. Adams, Diederik Depla, Remi Dingreville
Summary: We propose a generalized multi-phase-field model for predicting the growth of polycrystalline thin films fabricated by physical vapor deposition. This model considers the explicit transport of atomic species to the substrate and the competing diffusion processes on the surface and in the bulk of the film, leading to the formation of films with specific microstructures. Using Monte Carlo simulations with the SiMTRA code, we calculate the energy and direction of arriving atoms at the substrate under magnetron sputtering conditions. Our simulation results agree with the transmission electron microscopy characterization of sputtered films and provide insights into the complex relationships between deposition conditions and bulk and surface morphologies.
Article
Engineering, Electrical & Electronic
Pragati Singh, Raghvendra Pandey, K. K. Srivastava, Prabhakar Singh
Summary: The influence of calcium doping on the Y3GaO6 system was investigated, and it was found that doping with calcium up to 0.02 increased the conductivity, while higher concentrations of calcium doping resulted in the formation of secondary phases and a decrease in conductivity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Mohammad Reza Rahmani Taji Boyuk, Hajar Ghanbari, Abdolreza Simchi, Ali Maghsoumi
Summary: Under special conditions in seedless CVD, large-area 2D WS2 layers with disc-shaped morphology can be grown, which is attractive for the fabrication of optoelectronic devices.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Emily Jeng, Zhen Qi, Ajay R. Kashi, Sara Hunegnaw, Ziyang Huo, John S. Miller, Leonardus B. Bayu Aji, Byung Hee Ko, Haeun Shin, Sichao Ma, Kendra P. Kuhl, Feng Jiao, Juergen Biener
Summary: This study systematically investigated the effect of thickness and morphology of Cu catalyst coatings on electrochemical CO2 reduction (ECR) performance. The results showed that electron beam (EB) Cu outperformed magnetron-sputtered (MS) Cu in terms of current density, selectivity, and energy efficiency, with 400 nm thick catalyst coatings performing the best. The superior performance of EB-Cu catalysts was attributed to their faceted surface morphology and sharper Cu/gas diffusion layer interface.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Crystallography
Yutaka Kimura, Ryuji Oshima, Atsuhito Sawabe, Hideo Aida
Summary: This study provides a detailed investigation into the mechanism of heteroepitaxial diamond growth, focusing on the transition from three-dimensional to two-dimensional growth. Through ion irradiation and microwave plasma chemical vapor deposition (MPCVD) process, the growth of diamond grains to form a film is observed, along with the improvement of in-plane orientation and gradual increase of diamond component.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Crystallography
Xueyi Zheng, Jun Zheng, Chen He, Xiangquan Liu, Yuhua Zuo, Buwen Cheng, Chuanbo Li
Summary: Thin beta-(AlxGa1-x)2O3 films were grown on (2 0 1) beta-Ga2O3 substrates using MOCVD. The Al content and band gap energy of beta-(AlxGa1-x)2O3 were determined, with a band gap of 5.26 eV found for 24.1% Al content. Surface morphology analysis showed a smooth surface with bar-like particles. The growth model suggested that the film exhibited step bunching and the roughness decreased with higher Al content. Additionally, beta-(AlxGa1-x)2O3/Ga2O3 multi-quantum well structures were successfully grown and characterized.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Chemistry, Inorganic & Nuclear
Zhi-Cheng Wang, Kulatheepan Thanabalasingam, Jan P. Scheifers, Alenna Streeter, Gregory T. McCandless, Jonathan Gaudet, Craig M. Brown, Carlo U. Segre, Julia Y. Chan, Fazel Tafti
Summary: The crystal structure and magnetic properties of a new copper tellurite sulfate compound were analyzed, suggesting it as a promising alternative to layered perovskites for future experiments aiming to tune the Mott insulating ground state into superconducting or spin liquid states.
INORGANIC CHEMISTRY
(2021)
Article
Physics, Multidisciplinary
Asim Mantarci
Summary: The study coated In0.4Ga0.6N thin films on GaN/p-Si substrates using radio frequency magnetron sputter under different power levels, and found significant changes in crystal structure and physical parameters corresponding to the applied power values. Different behaviors were observed in optical bandgap, texture coefficient, and optical conductivity of the films under various power levels.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Wenxiao Hu, Kai Chen, Tao Tao, Xinxin Yu, Jianjun Zhou, Zili Xie, Bin Liu, Rong Zhang
Summary: This paper presents a study on high-quality (100) single-crystal diamond film grown by microwave plasma chemical vapor deposition (MPCVD). By optimizing the pre-etching process, a smooth surface chemical vapor deposition (CVD) diamond layer with low roughness and high growth rate was achieved, showing potential for high-performance hydrogen-terminal diamond-based electronic devices.
Article
Crystallography
Tomoaki Oga, Ryoya Kai, Naho Kaneko, Hisashi Miyazaki, Satoru Kaneko, Akifumi Matsuda, Mamoru Yoshimoto
Summary: The effect of VUV light irradiation on the COP substrates enhanced the crystal growth and improved the optical properties of ZnO thin films used in flexible optical devices. The pretreatment made the COP surface hydrophilic and smooth, resulting in increased orientation growth and crystallinity of the ZnO thin films. The resistivity of the ZnO thin film on the pretreated COP substrate was lower than that on the untreated substrate.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Biochemistry & Molecular Biology
Mikhail S. Kuklin, Antti J. Karttunen
Summary: Binary zinc(II) oxide and copper(II) oxide are commonly used in various applications, but there are no reported crystal structures for ternary Cu-Zn-O oxides. In this study, the structural characteristics and thermodynamics of Cu(x)Zn(y)O(z) ternary oxides were investigated using crystal structure prediction and quantum chemical methods. The results demonstrate that the magnetic Cu2Zn2O4 system is the most thermodynamically favorable, although the most favorable ternary crystal structure is still slightly higher in Gibbs free energy compared to experimental binary phases. The materials predicted in this study are indirect band gap semiconductors.
Article
Materials Science, Multidisciplinary
E. Kutlu-Narin, P. Narin, A. Yildiz, S. B. Lisesivdin
Summary: The study looked at the effects of magnesium content and growth temperature on the optical and structural properties of magnesium zinc oxide films, finding a linear correlation between magnesium mole fraction and magnesium content in the liquid solution. The peak of the (0002) diffraction for the grown samples shifted to higher angles and became stronger with increasing magnesium content in the liquid solution. Both growth temperature and magnesium content in the liquid solution are crucial parameters in controlling the magnesium mole fraction of the samples.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Martin Wilken, Engin Ciftyuerek, Stefan Cwik, Lukas Mai, Bert Mallick, Detlef Rogalla, Klaus Schierbaum, Anjana Devi
Summary: The fabrication of nanostructured WO3 thin films for hydrogen gas sensing applications is achieved through a new chemical vapor deposition process. The surface characteristics and morphology of the as-grown WO3 layers are thoroughly analyzed, along with the stoichiometry, using various techniques. The WO3 layer shows remarkable sensitivity to hydrogen gas and exhibits a high and repeatable sensor response.
Article
Materials Science, Multidisciplinary
Timo Fromm, Sebastian Bruns, Marie-Christin Mueller, Alexander Fink, Rudolf Borchardt, Stefan M. Rosiwal, Karsten Durst
Summary: A novel process was developed for fabricating diamond-metal laminates, with the successful creation of diamond-based biomimetic brick-and-mortar structures. The laminates exhibit high nominal strengths exceeding other ceramic-metal composites by at least a factor of two, with fracture energy in a medium range. Diamond layers provide damage tolerance in the laminates.
MATERIALS & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
Hanqing Liu, Feng Zhou, Xiaoyu Shi, Keyan Sun, Yan Kou, Pratteek Das, Yangeng Li, Xinyu Zhang, Srikanth Mateti, Ying Chen, Zhong-Shuai Wu, Quan Shi
Summary: We report a versatile strategy for designing high-enthalpy flexible phase change nonwovens (GB-PCN) by wet-spinning hybrid graphene-boron nitride fiber and impregnating paraffins. GB-PCN exhibits unprecedented enthalpy value, excellent thermal reliability, anti-leakage capacity, thermal cycling ability, and high water vapor permeability. The wearable thermal management systems based on GB-PCN demonstrate great potential for maintaining human body at a comfortable temperature range for a long time.
NANO-MICRO LETTERS
(2023)
Article
Chemistry, Analytical
Vahide Ghanooni Ahmadabadi, Md Mokhlesur Rahman, Ying Chen
Summary: Graphite nanostructures with high surface area were successfully produced through a ball-milling process, improving the electrochemical performance and charge-discharge rate capability of graphite. The graphite nanoflakes retained a capacity of about 75 mAh/g at a current rate of 10 C. The association between the structural characteristics and electrochemical properties revealed the Li+ surface-storage mechanism.
Article
Engineering, Electrical & Electronic
Peng Chen, Qi Yao, Junqi Xu, Qiang Sun, Alexander J. Grutter, Patrick Quarterman, Purnima P. Balakrishnan, Christy J. Kinane, Andrew J. Caruana, Sean Langridge, Ang Li, Barat Achinuq, Emily Heppell, Yuchen Ji, Shanshan Liu, Baoshan Cui, Jiuming Liu, Puyang Huang, Zhongkai Liu, Guoqiang Yu, Faxian Xiu, Thorsten Hesjedal, Jin Zou, Xiaodong Han, Haijun Zhang, Yumeng Yang, Xufeng Kou
Summary: Intercalating ferromagnetic MnTe layers into the framework of MnBi2Te4 can create ferromagnet-intercalated MnBi2Te4 superlattices with tunable magnetic exchange interactions. By using molecular beam epitaxy, we have created [(MBT)(MnTe)(m)](N) superlattices and investigated their magnetic interaction properties using polarized neutron reflectometry and magnetoresistance measurements. The incorporation of ferromagnetic spacers adjusts the antiferromagnetic interlayer coupling of the MnBi2Te4 layers through the exchange-spring effect at MnBi2Te4/MnTe hetero-interfaces. The thickness of MnTe can be used to modulate the relative strengths of the ferromagnetic and antiferromagnetic order, and the superlattice periodicity can tailor the spin configurations of the synthesized multilayers.
NATURE ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Xin Hu, Yimin Chen, Wei Xu, Yi Zhu, Donggun Kim, Ye Fan, Baozhi Yu, Ying Chen
Summary: A series of thermoplastic polyurethane (TPU)-based 3D-printed electrodes for flexible and customizable high-performance lithium-ion batteries were developed via fused deposition modeling. The TPU-based electrodes exhibited high dimensional accuracy, flexibility, and mechanical stability. This study provides a new avenue to achieve customizable and flexible batteries and offers a promising way to erase the performance gap between 3D-printed and conventional lithium-ion batteries.
Article
Chemistry, Physical
Chunqiang Zhuang, Weiming Li, Tianyang Zhang, Jintao Li, Yihong Zhang, Ge Chen, Haitao Li, Zhenhui Kang, Jin Zou, Xiaodong Han
Summary: Monodispersed metal sites are commonly believed to be the active centers responsible for the high activity and selectivity of catalysts. However, this study finds that monodispersed aluminum (Al) metal sites are not the active centers, but instead create abundant nitrogen non-metal active centers in carbon nitrides. These findings offer a new perspective on the important role of monodispersed metal sites in highly effective catalytic reactions.
Article
Materials Science, Multidisciplinary
Junli Guo, Deping Lu, Jin Zou
Summary: The performance of Cu-Fe alloy is influenced by the solidification structure, which is determined by the microstructural evolution during solidification. The study examined the solidification sequence, solid-liquid interface variation, and microstructural evolution of Cu-20wt%Fe alloy at different cooling rates. It was found that the remelting of primary gamma-Fe dendrites occurred and the Fe phase morphology changed as the cooling rate increased. The growth of the primary gamma-Fe phase was inhibited due to insufficient diffusion of Fe and Cu at the solidification front.
Article
Engineering, Electrical & Electronic
Zihan Li, Shanshan Liu, Jiabao Sun, Jiayi Zhu, Yanhui Chen, Yunkun Yang, Linfeng Ai, Enze Zhang, Ce Huang, Pengliang Leng, Minhao Zhao, Xiaoyi Xie, Yuda Zhang, Nesta Benno Joseph, Rajdeep Banerjee, Awadhesh Narayan, Jin Zou, Wenqing Liu, Xiaodong Xu, Faxian Xiu
Summary: The Curie temperature of Fe5+xGeTe2 thin films can be modulated from 260 to 380 K via iron doping, allowing the two-dimensional material to be used to create planar spiral inductors and low-pass Butterworth filters.
NATURE ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Wan-Yu Lyu, Wei-Di Liu, Meng Li, Xiao-Lei Shi, Min Hong, Tianyi Cao, Kai Guo, Jun Luo, Jin Zou, Zhi-Gang Chen
Summary: Doping of the rare-earth element Lu can enhance the thermoelectric performance of GeTe by strengthening phonon scattering and suppressing lattice thermal conductivity. Co-doping of Lu and Sb further optimizes the carrier concentration and leads to improved electrical and thermal properties. This study highlights the potential of Lu and Sb co-doping for boosting the thermoelectric performance of GeTe-based materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Review
Materials Science, Multidisciplinary
Lulu An, Yuanlie Yu, Qiran Cai, Srikanth Mateti, Lu Hua Li, Ying Ian Chen
Summary: The urgent need for ultrahigh thermally conductive materials in the electronics industry has led to the exploration of hexagonal boron nitride nano-sheets (BNNSs) as an ideal choice. This article provides a comprehensive review of various fabrication methods for BNNSs, discusses the impact of BNNS properties on their thermally conductive properties, and explores the use of BNNSs as fillers in polymer-based materials. The aim of this review is to inspire new fabrication methods and improvements for BNNS/polymer composites and promote their practical application as thermal transport/dissipation materials.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Multidisciplinary Sciences
Yingying Zou, Chao Liu, Chaoqi Zhang, Ling Yuan, Jiaxin Li, Tong Bao, Guangfeng Wei, Jin Zou, Chengzhong Yu
Summary: Constructing regular three-dimensional structures from two-dimensional nanosheets is challenging but holds great potential for enhancing their functional properties. In this study, the authors synthesized metal-organic frameworks with an orthogonal nanosheet array by epitaxially growing single crystalline nanosheets as shells on a cubic metal-organic framework core. The resulting structure exhibited improved electrocatalytic activity for oxygen evolution compared to conventional nanosheets. The density and size of the nanosheets in the core-shell structure could be adjusted, and metal-organic frameworks with a single composition and hollow orthogonal nanosheet array morphology were also obtained.
NATURE COMMUNICATIONS
(2023)
Review
Electrochemistry
Srikanth Mateti, Irin Sultana, Ying Chen, Manikantan Kota, Md Mokhlesur Rahman
Summary: Conventional boron nitride materials have different crystalline forms and are used in various applications. Recently, nanostructured boron nitride materials with new properties have been achieved due to advanced synthesis techniques. Incorporating these materials into electrochemical systems can offer benefits such as higher stability. This review article discusses the integration of nanostructured boron nitride into electrolytes, separators, and electrodes of rechargeable batteries, highlighting their structures, properties, and potential future applications.
Article
Chemistry, Multidisciplinary
Kasturi Vimalanathan, Zhi Zhang, Jin Zou, Colin L. Raston
Summary: Hollow C-70 nanotubules are formed by intense micro mixing of toluene solution of C-70 and isopropyl alcohol in a thin film of a vortex fluidic device (VFD), without the need for auxiliary reagents, high temperatures and pressures, and downstream processing. The self-assembly mechanism is consistent with the nanotubules being a mould of the high shear double helical topological flow generated within the thin film by Faraday waves and Coriolis forces.
CHEMICAL COMMUNICATIONS
(2023)
Article
Metallurgy & Metallurgical Engineering
Junli Guo, Qiang Hu, Jin Zou, Deping Lu
Summary: Cu-Fe alloys are copper-based materials with high strength and high conductivity, which have great potential. The cooling rate during solidification significantly affects the morphology and distribution uniformity of the Fe phase, making it an essential control parameter. Adjusting the cooling conditions during solidification can control the morphology and distribution uniformity of the Fe phase in Cu-Fe alloys, thereby enhancing their functional properties and enabling further applications.
METALLURGICAL RESEARCH & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Donggun Kim, Ye Fan, Srikanth Mateti, Yimin Chen, Xin Hu, Qiran Cai, Baozhi Yu, Ying (Ian) Chen
Summary: Researchers developed a void-free design using inorganic-gel hybrid electrolyte and in-situ polymeric interlayers to improve the performance of solid-state lithium batteries.
Article
Engineering, Environmental
Meng Li, Sheng-Duo Xu, Wan-Yu Lyu, Qiang Sun, Min Hong, Yuan Wang, Ji-Xing Liu, Yu Yin, Jin Zou, Zhi-Gang Chen
Summary: This work reports on the thermoelectric properties of (CaTe)(x)(GeTe)(100-x) materials, which consist of CaTe nanoinclusions and a GeTe matrix. By increasing the Ca fraction, the figure-of-merit and heat-to-electricity efficiency of GeTe are significantly enhanced. The study provides insights into the design and development of high-performance GeTe thermoelectric materials.
CHEMICAL ENGINEERING JOURNAL
(2023)
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)
