Article
Materials Science, Multidisciplinary
Sakal Pech, Sara Kim, Nam-Hoon Kim
Summary: This study investigates the crystalline quality of polycrystalline beta-Ga2O3 films through rapid thermal annealing. The results show that by annealing at 900°C under a N2 gas atmosphere for 45 minutes, optimized polycrystalline beta-Ga2O3 films with improved crystal structure can be obtained.
Article
Chemistry, Physical
Ning Zhang, Yongsheng Wang, Zihao Chen, Bin Zhou, Jie Gao, Yanxia Wu, Yong Ma, Hongjun Hei, Shengwang Yu
Summary: The quality of β-Ga2O3 films with top layer doping of nitrogen was found to be related to the N content and annealing atmosphere, leading to high transmittance and ultraviolet emission properties.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Xinrong Chen, Wei Mi, Meng Li, Jinze Tang, Jinshi Zhao, Liwei Zhou, Xingcheng Zhang, Chongbiao Luan
Summary: Optoelectronic artificial synapses based on Pt/beta-Ga2O3/Pt structure were fabricated and investigated for their optoelectronic plasticity, demonstrating capabilities in simulating synaptic memory states, learning behavior, and response to different light wavelengths. The compact structure with low power consumption and crosstalk allows for efficient processing of large data sets.
Article
Physics, Condensed Matter
Amit Kumar Singh, Mukul Gupta, V Sathe, Y. S. Katharria
Summary: Gallium oxide (Ga2O3) films were deposited using RF magnetron sputtering on quartz and n-type Si (100) substrates at room temperature, and the effect of annealing temperature on the crystalline structure and band gap of beta-Ga2O3 thin films was investigated. Monoclinic polycrystalline thin films were formed, with a bandgap estimated in the range of 4.75 eV-5.15 eV. Raman spectra showed shifts in Ga2O3 phonon modes, and absorption bands at 647.05 cm(-1) due to vibrations of Ga-O bonds were identified through Fourier-transform infrared spectroscopy.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Henry Samir Vanegas Parra, Sebastian Calderon Velasco, Jose Edgar Alfonso Orjuela, Jhon Jairo Olaya Florez, Sandra Carvalho
Summary: In this study, Ag-ZrSiN coatings with varying silver atomic contents were produced using pulsed-DC reactive magnetron sputtering. The effects of silver incorporation on the microstructure, morphology, and optical and electrical properties were investigated. The results showed that the electrical resistivity and transmittance of the coatings decreased with increasing silver content.
Article
Materials Science, Multidisciplinary
Wei Mi, Xinwei Li, Yue Ding, Di Wang, Mingsheng Xu, Longfei Xiao, Xingcheng Zhang, Xinrong Chen, Bingkun Li, Liyuan Luo, Jinshi Zhao, Liwei Zhou, Junli Yu
Summary: Ga2O3 films were grown on Si (100) substrates via RF magnetron sputtering at room temperature. The large lattice mismatch led to poor crystalline quality and cracking. To solve this issue, a method combining pre-deposited seed layer and post-annealing process was proposed. The prepared film showed high crystalline quality and thickness of 160 nm when the seed layer was 9 nm and annealing temperature was 800 °C. The seed layer provided nucleation sites and alleviated lattice mismatch, while annealing promoted recrystallization and improved Ga2O3 quality. This work promotes the development of Ga2O3-based devices on Si substrates and solves the heat dissipation problem.
Article
Materials Science, Multidisciplinary
Ausama Khudiar, Mohammed K. Khalaf, Attared M. Ofui
Summary: The study investigated the effects of various annealing temperatures on the physical properties of zinc oxide nanostructures, showing changes in crystallite size, electrical, optical, and gas sensing properties. The results indicated an increase in crystallite size, optical band gap, and electrical conductivity with annealing temperature, while the gas sensing properties of the nanostructures improved.
Article
Materials Science, Ceramics
S. Limwichean, N. Kasayapanand, C. Ponchio, H. Nakajima, V Patthanasettakul, P. Eiamchai, G. Meng, M. Horprathum
Summary: The tungsten trioxide nanostructure thin films fabricated by MS-GLAD technique show enhanced PEC efficiency compared to single layer samples, with various morphologies available and detailed analysis on chemical composition and work function.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Yi Shang, Ke Tang, Zhuorui Chen, Zhiluo Zhang, Jie Deng, Yan Hu, Keyun Gu, Meng Cao, Linjun Wang, Jian Huang
Summary: The Ta-doped Ga2O3 films were successfully grown with uniform, smooth surface morphology and high transparency (>85%) in the wavelength region of 300-800 nm. The films showed low resistivity of 0.089 Omega cm and high carrier concentration of 2.4 x 10(19) cm(-3). XPS spectra confirmed the incorporation of Ta into the films and the presence of Ta5+ ions.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Physics, Applied
Takafumi Kusaba, Phongsaphak Sittimart, Yuki Katamune, Taisuke Kageura, Hiroshi Naragino, Shinya Ohmagari, Sreenath Mylo Valappil, Satoki Nagano, Abdelrahman Zkria, Tsuyoshi Yoshitake
Summary: In this study, the heteroepitaxial growth of β-Ga2O3 thin films on single crystalline diamond (111) wafers using RF magnetron sputtering is demonstrated. The obtained thin films show a single monoclinic (beta-phase) structure with a monofamily { 2 over bar 01} plane. XRD pole figure analysis confirms the successful epitaxial growth of β-Ga2O3 on diamond. This research provides valuable insights for the future development of scalable β-Ga2O3/diamond heterostructures with high performance and effective self-thermal management.
APPLIED PHYSICS EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Zhengwei Chen, Kunpeng Ge, Dongdong Meng, Xu Chen
Summary: In this study, epitaxial Ga2O3 films were successfully grown on sapphire substrates using RF magnetron sputtering method. The films exhibited different polymorphs depending on the substrate plane, and had a bandgap of 4.88-5.30 eV.
Article
Chemistry, Analytical
Dengyue Li, Hehui Sun, Tong Liu, Hongyan Jin, Zhenghao Li, Yaxin Liu, Donghao Liu, Dongbo Wang
Summary: The influence of O-2 flow rate on the properties of Ga2O3 thin films prepared by RF magnetron sputtering was investigated. XRD, AFM, SEM, transmittance spectra, and PL spectra were used to study the Ga2O3 films. It was found that the crystal quality and luminescence intensity of the Ga2O3 samples initially decreased and then increased with increasing oxygen flow rate. This suggests that reducing the oxygen defect density is responsible for the improved crystal quality and emission intensity of the material. It was demonstrated that high-quality Ga2O3 materials could be obtained by adjusting the oxygen flow rate.
Article
Chemistry, Physical
Yoo-Young Oh, Jae-hoon Ji, Seoung Hyoun Kim, Jung-Hyuk Koh
Summary: A novel method was successfully applied to deposit Ga2O3 thin film as wide band gap material, utilizing radiofrequency sputtering system and ytterbium-laser irradiation to enhance energy density. Unique crystalline properties and optical energy bandgap were observed, confirming the effectiveness of infrared optical energy in fabricating beta-Ga2O3 thin film.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
T. S. Ogneva, A. A. Ruktuev, N. Yu. Cherkasova, Yu. N. Malyutina, M. N. Khomyakov, V. G. Burov, I. A. Bataev
Summary: NiAl-based intermetallic films were obtained using mosaic targets by magnetron sputtering. The structure and properties of the coatings were evaluated based on the type of target, target-to-substrate distance, and substrate material. The distribution of Ni and Al in the coatings varied depending on the target type. The surface morphology of the films changed from rough islands to smoother surfaces as the target-to-substrate distance decreased.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Ke Jia, Guojing Wang, Shasha Lv, Yan Li, Shengjie Du, Zhengcao Li
Summary: This study fabricated Cr2AlB2 and Cr4AlB4 MAB phase coatings by magnetron sputtering and post-annealing, and found that the phase compositions and morphologies of the coatings were closely related to the Al content and annealing temperature. Cr2AlB2 phases could be obtained as pure and dense crystalline coatings within a temperature range of 650-800 degrees C, while achieving phase-pure and well-crystallized Cr4AlB4 coatings proved challenging.
Article
Materials Science, Multidisciplinary
Ping Zhang, Xiujie Yue, Yeran Gao, Zhenyong Lin, Shunxiang Wang, Songting Zhang
Summary: This paper investigates the strengthening mechanism of highspeed cutting and solid particle-entrained waterjet peening (HSC-WJP) composite reinforcement on 7075-T6 aluminum alloy. The research results show that composite reinforcement can improve surface quality, reduce surface pits and roughness, and decrease the size of precipitation-free zone (PFZ) at grain boundaries.
Article
Materials Science, Multidisciplinary
Sangyoon Lee, Hwi Yoon, Sanghun Lee, Seung-min Chung, Hyungjun Kim
Summary: The wettability of metal oxides, particularly HfO2 thin films deposited via atomic layer deposition, and its correlation with surface free energy have been studied. It was found that surface oxygen species significantly affect the intrinsic hydrophilicity of HfO2 thin films, and the crystalline orientations also evolve with film thickness.
Article
Materials Science, Multidisciplinary
Changdong Yin, Yiwen Wu, Zhou Xu, Dongdong Ye, Jun Yao, Jianjun Chen, Qiang Liu, Xin Ge, Meiling Ding
Summary: This study proposed a new strategy to indirectly estimate the hydrogen diffusivity of metallic materials under tensile stress by combining the electrochemical hydrogen permeation test (EHPT), the hydrogen diffusion descriptive equation based on Fick's law, and hydrogen pre-charged tensile test. The results showed that the hydrogen permeation curve obtained was highly approximate to the theoretical trend. The hydrogen embrittlement (HE) susceptibility of the specimens increased with increasing stress.
Article
Materials Science, Multidisciplinary
Huan Luo, Wei-yi Wang, Xin Yu, Xian-jun Lei, Lang Liu, Guo-zheng Zha, Wen-long Jiang, Bin Yang, Bao-qiang Xu
Summary: Separating selenium and tellurium is a general challenge in material and non-ferrous metallurgical industries. This paper proposes a novel method that achieved efficient separation of selenium and tellurium using gas-liquid equilibrium phase diagram and valence regulation-vacuum gasification technique.
Article
Materials Science, Multidisciplinary
Fan Zhang, Rong Xin Wang, Aiqin Tian, Fangzhi Li, Jianping Liu, Hui Yang
Summary: Deposition of Pd/Pt/Au three-layer films on p-GaN under high and ultra-high vacuum conditions was studied to investigate the electrical contact properties. Linear I-V curves were observed in samples deposited under ultra-high vacuum conditions, while nonlinear I-V characteristics were obtained in samples deposited under high vacuum conditions. The study also found that the samples deposited under high vacuum conditions had higher amounts of oxygen and Pd oxide. The oxide layer had an additional influence on the electrical characteristics of the Pd/Pt/Au/p-GaN contact.
Article
Materials Science, Multidisciplinary
Hongli Liu, Chengzhe Liu, Ying Sui, Zhongxian Liu, Tiangang Zhang, Zhiqiang Zhang, Shuang Sun, Jianwei Jia
Summary: This study utilized polysiloxane and hafnium carbide to produce Si-N-C-O-Hf hybridized ceramic fibers, and obtained ceramic fibers with hemispherical particles on the surface through electrostatic spinning and pyrolysis. The ceramic fibers exhibited excellent thermal stability, oxidation resistance, and high temperature insulation.
Article
Materials Science, Multidisciplinary
M. Abaker, Nazar Elamin Ahmed, A. Saad, H. F. Khalil, E. M. M. Ibrahim, A. M. Adam
Summary: This paper systematically studied the internal structure and thermoelectric properties of In1-xGaxSb alloys prepared by melting synthesis at 1123 K. The results showed that doping with Ga in the In sites led to a significant increase in the Seebeck coefficient and power factor, while reducing the thermal conductivity. The maximum dimensionless figure of merit was observed at 403 K.
Article
Materials Science, Multidisciplinary
Fucheng Yu, Jinlong Ren, Jielin Zhang, Haiyang Chen, Xin Tian, Chenchen Feng, Cuixia Li, Jianbin Zhang, Xianxi Tang, Xiaogang Hou
Summary: An environmentally friendly ZnO@BiVO4 composite photocatalyst was prepared using in-situ self-assembly and solvothermal methods, demonstrating good photocatalytic performance. The mass ratio of BiVO4 and NCZ was found to influence the photocatalytic performance of the composite.
Article
Materials Science, Multidisciplinary
Yaoming Shao, Pingping Zheng, Tianhao Dong, Lianghuan Wei, Haifei Wu, Jianxiao Si
Summary: In this paper, Mg3Bi2 films were prepared on glass substrate using magnetron sputtering, and the phase composition and thermoelectric properties of the films were investigated with different atomic ratios. The films displayed a metastable cubic phase and high conductivity when the atomic ratio exceeded stoichiometry.
Article
Materials Science, Multidisciplinary
I. V. Uimanov, D. L. Shmelev, S. A. Barengolts
Summary: A two-dimensional axisymmetric model has been developed to study the prebreakdown processes in a cathode microprotrusion under an external electric field. The simulation results show that electrohydrodynamic instability leads to the formation of a nanometer-sized conical protrusion on the microprotrusion tip, significantly accelerating the heating process.
Article
Materials Science, Multidisciplinary
Weilun Zhang, Di Yang, Feng Gong, Yongjun Chen, Tian Chen, Zhiwen Xie, Sirui Yang
Summary: A novel Pt doping method was designed to improve the thermal stability of CrWN coating. The doping of Pt atoms effectively blocks the coherent growth of the grains and creates a significant mixing effect, resulting in a smooth surface with uniform element distribution.
Article
Materials Science, Multidisciplinary
Xiaoye Wang, Xiaoguang Yang, Wenna Du, Tao Yang
Summary: In this study, the effects of multiple growth parameters on self-catalyzed growth of InAs/GaSb axial heterostructured nanowires on Si substrate by MOCVD were investigated. It was found that the growth temperature and switching time have significant influences on the nanowire growth.
Article
Materials Science, Multidisciplinary
Weizhong Cui, Yan Zhao, Can Cui, Xing Liu, Beili Pang, Jianguang Feng, Hongzhou Dong, Liyan Yu, Lifeng Dong
Summary: This study introduces Co2+ cations into Cs2AgBiBr6 film to improve its quality, grain size, and conductivity, resulting in enhanced solar cell efficiency.
Article
Materials Science, Multidisciplinary
Jian Wang, Ke Yang, Xianming Cheng, Yalin Lu, Ganghui Wu, Yang Zhang, Yun Kan
Summary: The corrosion behavior and microstructural evolution of Sc microalloyed Al-3.2Cu-1.5Li alloys were investigated in detail. The microstructural results showed higher levels of dislocations density in the Sc microalloyed sample, which resulted in significantly refined grains and T1 precipitates. Microalloying with Sc changed the corrosion mode of the alloy and localized corrosion was found to occur preferentially at the subgrain within unrecrystallized grains with high grain stored energy.
Article
Materials Science, Multidisciplinary
Weifeng Liu, Na Liu, Kaiqiang Song, Meiqin Zeng, Zhongchen Lu
Summary: Monoclinic WO3 prepared through plasma milling exhibits higher photocatalytic activity due to its higher surface area, increased oxygen vacancies, and defects.