Article
Chemistry, Physical
Ioan Petrovai, Otto Todor-Boer, Leontin David, Ioan Botiz
Summary: In this study, the researchers found that the nucleation and growth of perovskite crystals can be controlled by manipulating the evaporation rate of solvents. Temperature control was used to regulate the rate of solvent evaporation, leading to variations in the growth rate and shape of perovskite crystals. Diluted perovskite solutions were utilized to control nucleation and promote the growth of a limited number of crystals, which exhibited sixfold symmetry. Crystals formed at lower temperatures (40-60 degrees C) displayed a more compact dendritic morphology, while those grown at higher temperatures (80-110 degrees C) exhibited a fractal dendritic shape.
Article
Chemistry, Multidisciplinary
Ming-Yu Kuo, Natalia Spitha, Matthew P. Hautzinger, Pei-Lun Hsieh, Jing Li, Dongxu Pan, Yuzhou Zhao, Lih-Juann Chen, Michael H. Huang, Song Jin, Yung-Jung Hsu, John C. Wright
Summary: This study successfully prepared 2D/3D halide perovskite heterostructures through solution growth, revealing differences in carrier transfer and recombination among different types of 2D/3D heterostructures. The findings provide insights into charge transfer mechanisms in these perovskite heterostructures and offer guidelines for designing better optoelectronic devices.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Ruiyao Xu, Beibei Xu, Xiaomeng You, Danni Shao, Guoliang Gao, Fangfang Li, Xue-Lu Wang, Ye-Feng Yao
Summary: The photocatalytic production of hydrogen via single-atom catalysts (SACs) has gained attention for the environmentally friendly hydrogen production. However, a facile method of fabricating SACs without aggregation of active atoms remains undeveloped. This study proposes a novel photochemical reaction in a frozen precursor solution to prepare SACs with active Pd atoms on g-C3N4 supports. The results show that the proposed method can be universally applied and provide higher photocatalytic hydrogen production performance compared to the non-frozen control group.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Leilah Krounbi, Konrad Hedderick, Zohar Eyal, Lior Aram, Eyal Shimoni, Lara A. Estroff, Assaf Gal
Summary: Many organisms can control the precipitation of minerals using soluble ions at ambient conditions, with a multistep route being a common strategy. Marine microalgae produce coccoliths as a model system for controlled biomineralization, forming calcium carbonate crystalline arrays at low calcium concentrations.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
K. Vasanth Kumar, Claire Heffernan, Kiran A. Ramisetty, Christopher A. Howard, Sergey Beloshapkin
Summary: This study demonstrates the potential of using Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) to simultaneously quantify the distribution of structurally-similar impurities on the surface of crystals. The results provide new information that can help to understand the crystallisation process.
Article
Chemistry, Physical
Elzbieta Gradauskaite, Natascha Gray, Marco Campanini, Marta D. Rossell, Morgan Trassin
Summary: Efforts to integrate ferroelectric materials into nonvolatile, low energy consuming memories have focused on perovskite oxide materials. However, finite-size effects hinder their down-scaling for nanodevices, and alternative materials with robust polar properties are needed. Layered ferroelectrics of the Aurivillius phase have emerged as promising candidates with robust polarization at subunit-cell thicknesses, but controlled growth in epitaxial thin film form remains challenging. Here, the stabilization of coalescent layer-by-layer growth mode for Aurivillius family homologues is demonstrated, providing a systematic framework for the integration of high-quality epitaxial layered ferroelectrics into oxide electronics.
CHEMISTRY OF MATERIALS
(2021)
Article
Physics, Multidisciplinary
Manodeep Mondal, Rajesh Ganapathy
Summary: Surface strain affects the dynamics of adsorbates and their interactions. In the case of epitaxy with lattice mismatch, strain-mediated effects are further compounded. In this study, we observed that the diffusivity of adsorbates in a multilayer colloidal film was nonmonotonic, even though the misfit strain relaxed with increasing film thickness. This nonmonotonic behavior can be attributed to the competition between the self-induced in-layer strain and the short interaction range. We also provided direct evidence for long-ranged strain-mediated interactions between the adsorbates, which altered the morphology of the growing film.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Vyacheslav Gorshkov, Vladimir Tereshchuk, Pooya Sareh
Summary: The study analyzed the physical mechanisms of nanocluster formation on nanowires, showing that long-range correlation between clusters is due to surface diffusion and shadow effects. Experimental findings on one-dimensional systems' self-ordering effects were presented, proposing optimal synthesis modes for increasing regularity in nanocluster localization.
CRYSTAL GROWTH & DESIGN
(2021)
Review
Chemistry, Multidisciplinary
Kaiyang Wang, Guichuan Xing, Qinghai Song, Shumin Xiao
Summary: Lead halide perovskites have been intensively explored for their promising future in photovoltaics and other optoelectronic devices, but face challenges in controlled synthesis and integration due to random shapes and distributions. The development of patterning and integration techniques, as well as the study of optical responses from nanostructured perovskites, are crucial for overcoming these barriers and advancing nanostructured-perovskite devices.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
K. Vasanth Kumar, Kiran A. Ramisetty, K. Renuka Devi, Gamidi Rama Krishna, Claire Heffernan, Andrew A. Stewart, Jian Guo, Srinivas Gadipelli, Dan J. L. Brett, Evangelos P. Favvas, Ake C. Rasmuson
Summary: Crystallization experiments on highly supercooled solutions produced highly pure and crystalline mesocrystals of curcumin, exhibiting a crystallographic hierarchy. The formation of spherulites is attributed to the high degree of supercooling and particle-mediated crystallization is proposed as an efficient method for organic compound purification.
Article
Chemistry, Multidisciplinary
Yuyan Zhao, Shuangshuang Tian, Jiangang Feng, Yuchen Qiu, Xin Fan, Meng Yuan, Yingjie Zhao, Hanfei Gao, Haibin Zhao, Lei Jiang, Jun Wang, Yuchen Wu
Summary: Epitaxy is used to achieve orientational growth of single-crystalline semiconductor materials. In this study, electrostatic epitaxy is developed to grow single-crystalline CsPbBr3 microwires through strong electrostatic interactions. These microwires can be directly grown on different substrates without the processes of lift-off and transfer, and demonstrate great potential for integrated optoelectronic devices.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Shaomin Peng, Zhuoying Yang, Ming Sun, Lin Yu, Yanguang Li
Summary: Metal halide perovskites are promising photocatalyst materials for solar fuel production due to their excellent photophysical properties. However, their structural instability poses a challenge for their practical applications. This review discusses the origin of the instability issue, analyzes design rules for robust structures, and presents different material design strategies for stability enhancement. Future research directions for stable and efficient metal halide perovskite photocatalysts are also outlined.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Liliang Huang, Bo Shen, Haixin Lin, Jiahong Shen, Liban Jibril, Cindy Y. Zheng, Chris Wolverton, Chad A. Mirkin
Summary: Scanning probe block copolymer lithography was used to explore the deposition of secondary metals on nanoparticle seeds in a two-step sequential manner. The occurrence of heterogeneous and homogeneous growth can be rationalized using the concepts of bond strength and lattice mismatch. The resulting nanoparticle structure depends on the degree of lattice mismatch, and heterodimer nanoparticles as seeds lead to asymmetric deposition of secondary metals.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Energy & Fuels
Huimin Zhang, Chunjun Liang, Mengjie Sun, Fulin Sun, Chao Ji, Xuejian Wan, Dan Li, Fangtian You, Zhiqun He
Summary: The proposed modified two-step sequential method successfully produces high-quality perovskite films with improved crystal growth and quality due to the addition of Cs+Rb+, resulting in a prolonged carrier lifetime and enhanced electron diffusion length. This ultimately leads to improved photovoltaic parameters and a high power conversion efficiency of 21.49% in the established devices.
Article
Chemistry, Inorganic & Nuclear
Shuo Chen, Yu Zhang, Qingyuan Chen, Chunchun Zhang, Meng Zhang, Kui Yu
Summary: This study presents a pathway for the formation of semiconductor magic-size clusters (MSCs) in aqueous solutions and provides an in-depth understanding of their formation mechanism.
INORGANIC CHEMISTRY
(2023)
Article
Physics, Multidisciplinary
Kosuke Beppu, Takayuki Shimasaki, Ichiro Fujii, Takahito Imai, Hideaki Adachi, Takahiro Wada
Article
Physics, Applied
Sangwook Kim, Hyunwook Nam, Piyush Sapkota, Gopal Prasad Khanal, Ichiro Fujii, Shintaro Ueno, Satoshi Wada
Summary: The leakage current mechanism in the 0.75BF-0.25BT ceramics is mainly controlled by the SCLC mechanism, with differences between the sintered and quenched ceramics potentially influenced by heat treatment. The study also revealed that the P-F emission and ST emission mechanisms did not contribute to the leakage current behavior.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Ceramics
Gopal Prasad Khanal, Ichiro Fujii, Sangwook Kim, Shintaro Ueno, Satoshi Wada
Summary: Lead-free piezoelectric ceramics were prepared with the addition of (Bi0.5K0.5)TiO3 and BiFeO3 components via solid-state reaction method. The study found that increasing the concentration of (Bi0.5K0.5)TiO3 can enhance the piezoelectric performance of the material while reducing the dielectric maximum temperature.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Gopal P. Khanal, Ichiro Fujii, Shintaro Ueno, Satoshi Wada
Summary: The mechanism of phase formation, dielectric, ferroelectric, and piezoelectric properties of BaTiO3 ceramics with oriented grains fabricated using BaCO3 matrix and HTO template particles were investigated. Sintering with samples' embedding prevented the formation of secondary phase, while the crystallographic orientation along a specific direction was developed by the epitaxial grain growth mechanism.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Physics, Applied
Norihiro Oshime, Kenji Ohwada, Kento Sugawara, Tomohiro Abe, Reiji Yamauchi, Tetsuro Ueno, Akihiko Machida, Tetsu Watanuki, Shintaro Ueno, Ichiro Fujii, Satoshi Wada, Ryota Sato, Toshiharu Teranishi, Miho Yamauchi, Kenji Ishii, Hidenori Toyokawa, Koichi Momma, Yoshihiro Kuroiwa
Summary: The improved Bragg coherent X-ray diffraction imaging (Bragg-CDI) apparatus allowed for the observation of the outer shape, size, and inner phase distribution for a single particle with a size of 40-500 nm.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Sangwook Kim, Hyunwook Nam, Ichiro Fujii, Shintaro Ueno, Chikako Moriyoshi, Yoshihiro Kuroiwa, Satoshi Wada
Summary: The study assessed the origin of material softening in BiFeO3-BaTiO3 ceramics by analyzing the crystal structure and structural parameters. It was found that the stability of the Bi ion off-centering position and the Bi ion off-centering displacement affect the material softening phenomenon. The suggested model of material softening can provide essential information for the design and development of next-generation lead-free piezoelectric materials.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Ceramics
Piyush Sapkota, Ichiro Fujii, Sangwook Kim, Shintaro Ueno, Chikako Moriyoshi, Yoshihiro Kuroiwa, Satoshi Wada
Summary: The study investigated the effects of one-step and two-step calcination methods on the crystal structure, microstructure, and electrical properties of BaTi1-2xMnxNbxO3 ceramics. It was found that ceramics calcined using the two-step method had lower dielectric loss and higher dielectric constants at high temperatures, making them potential candidates for temperature stable, DC-bias free capacitor applications.
CERAMICS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Sangwook Kim, Hyunwook Nam, Ichiro Fujii, Shintaro Ueno, Chikako Moriyoshi, Yoshihiro Kuroiwa, Satoshi Wada
Summary: This study investigated the origin of significantly large piezoelectricity and ferroelectricity in 0.67BiFeO(3)-0.33BaTiO(3) ceramics. It was found that despite a small lattice distortion at 300K, the material still exhibited significant piezoelectric properties, attributed to the off-centering of Bi ions. The off-centered Bi ions are believed to contribute to the ferroelectricity and piezoelectricity in a non-centrosymmetric structure with a small lattice distortion.
SCRIPTA MATERIALIA
(2021)
Article
Physics, Applied
Hyunwook Nam, Ichiro Fujii, Sangwook Kim, Takaaki Ishii, Shintaro Ueno, Gopal Prasad Khanal, Yoshihiro Kuroiwa, Satoshi Wada
Summary: This study investigated the chemical composition dependence of Bi(Mg0.5Ti0.5)O-3 (BMT)-modified BaTiO3 (BT)-BiFeO3 (BF) ceramics fabricated by solid-state synthesis. The research showed that controlling the BT/BF ratios and BMT concentration can alter the crystal structure and piezoelectric properties, making the ceramics potential candidate materials for various practical applications.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Piyush Sapkota, Ichiro Fujii, Sangwook Kim, Shintaro Ueno, Yoshihiro Kuroiwa, Satoshi Wada
Summary: The crystal structure, microstructure, dielectric, and ferroelectric properties of BaTi(1-2x)Mn(x)Nb(x)O-3 ceramics were investigated. It was found that the samples with x>=0.06 exhibited pseudo-cubic symmetry over a wide temperature range, but also showed domain structures and non-linear polarization-electric field response. The dielectric constant showed improved DC-bias dependence in the sample with x=0.06, and a qualitative model of chemical grain size (CGS) was proposed to explain the superparaelectricity in the ceramics.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Norihiro Oshime, Kenji Ohwada, Akihiko Machida, Nagise Fukushima, Shintaro Ueno, Ichiro Fujii, Satoshi Wada, Kento Sugawara, Ayumu Shimada, Tetsuro Ueno, Tetsu Watanuki, Kenji Ishii, Hidenori Toyokawa, Koichi Momma, Sangwook Kim, Shinya Tsukada, Yoshihiro Kuroiwa
Summary: The shapes and sizes of grains have significant effects on the anisotropy of crystal structures and the configuration of ferroelectric domains. This study introduces a method to observe a ferroelectric phase transition in single sub-micrometer-sized particles. By analyzing the pattern variations of Bragg coherent X-ray diffraction from a single particle of BaTiO3, the phase transition from cubic to tetragonal phase was observed, and the apparent strain distribution caused by dislocation within the crystal was imaged using Bragg coherent diffraction imaging.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Sangwook Kim, Ryuki Miyauchi, Yukio Sato, Hyunwook Nam, Ichiro Fujii, Shintaro Ueno, Yoshihiro Kuroiwa, Satoshi Wada
Summary: Piezoelectric materials are crucial in various applications, but there are still unanswered questions regarding their physical origin. This study utilizes high-energy synchrotron radiation X-ray diffraction to investigate the response of BiFeO3-BaTiO3 piezoelectrics and the intrinsic/extrinsic contributions to electric fields. The findings suggest that Bi3+-ion disordering plays a significant role in realizing piezoelectricity and nanodomains, and there is an extrinsic effect on the rearrangement of nanodomains. Understanding these effects is important for the development of next-generation Bi-based lead-free piezoelectric ceramics.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Ceramics
Gopal Prasad Khanal, Ichiro Fujii, Shintaro Ueno, Satoshi Wada
Summary: The <1100 & rang; grain-oriented 0.11(Bi0.5K0.5)TiO3-0.23BaTiO(3)-0.02Bi(Mg0.5Ti0.5)O-3-0.64BiFeO(3) piezoelectric ceramics were prepared using a reactive templated grain growth method with a platelike H1.08Ti1.73O4 center dot nH(2)O (HTO) template and Bi2O3-KHCO3-MgO-Fe2O3-BaCO3 matrix particles. By employing weight-pressing treatment and optimizing the sintering temperature, a high degree of texturing (a Lotgering orientation factor of 80%) and high density (95%) were achieved. The water-quenching treatment significantly enhanced the dielectric, ferroelectric, and piezoelectric properties, with an increase in dielectric constant, remanent polarization, and piezoelectric strain constant.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Hari Shankar Mallik, Ichiro Fujii, Yoshio Matsui, Gopal Prasad Khanal, Sangwook Kim, Shintaro Ueno, Tohru S. Suzuki, Satoshi Wada
Summary: Hexagonal-tetragonal co-existing barium titanate powders were prepared by reducing commercial barium titanate powders with their particle size of about 100 nm in a hydrogen atmosphere at different temperatures, resulting in a single particle containing both hexagonal and tetragonal phases. Different hexagonal contents were obtained by reducing at different temperatures, and the hexagonal phase could be transformed back to the tetragonal phase by annealing in air. A mechanism model for the complete transformation of barium titanate polymorph from tetragonal/cubic to hexagonal phases was proposed.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2021)
Article
Materials Science, Multidisciplinary
Yoshihiro Kuroiwa, Sangwook Kim, Ichiro Fujii, Shintaro Ueno, Yuki Nakahira, Chikako Moriyoshi, Yukio Sato, Satoshi Wada
COMMUNICATIONS MATERIALS
(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)
