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
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
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
Nanoscience & Nanotechnology
Luke A. M. Lyle, Tyson C. Back, Cynthia T. Bowers, Andrew J. Green, Kelson D. Chabak, Donald L. Dorsey, Eric R. Heller, Lisa M. Porter
Summary: Chemical and electrical measurements of Ti/(010) beta-Ga2O3 and Ti/(001) beta-Ga2O3 interfaces were conducted with XPS, J-V, and C-V measurements as a function of annealing temperature. The results show that the reactivity of Ti on the beta-Ga2O3 surface strongly affects the electrical performance and stability of Ti/beta-Ga2O3 ohmic contacts at elevated temperatures. The oxidized Ti amount increased with annealing temperature, and the Schottky barrier height had variations with temperature changes.
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
Engineering, Electrical & Electronic
Moonsang Lee, Mino Yang, Hae-Yong Lee, Hyun Uk Lee, Hyunhwa Lee, Hyungbin Son, Un Jeong Kim
Summary: This study investigated the structural characterization and properties of HVPE alpha-Ga2O3 materials as solar-blind UV photodetectors. The results showed excellent structural properties and optical bandgap of 5.15 eV, making it suitable for solar-blind photodetector applications. Photo-detectors synthesized using HVPE alpha-Ga2O3 exhibited excellent photo-response characteristics, supporting further development of functional oxide semiconductor materials and opto-electronic devices.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yu Miao, Bing Liang, Yaoyao Tian, Tinghui Xiong, Shujing Sun, Chenlong Chen
Summary: This study reports the growth of horizontal beta-Ga2O3 nanostructures and the evolution of nanowires from horizontal to obliquely upward growth through CVD method. Various techniques were used to analyze the morphology, structure, and optical properties of the nanowires, revealing four different growth modes. The preparation route presented in this study is simpler, more general, and cost-effective compared to other common methods, providing insights into the growth direction changes of nanowires and simplifying planar device processing technology.
Article
Nanoscience & Nanotechnology
Yong-Hee Lee, Byeongjun Gil, Duyoung Yang, Mi-Hyang Sheen, Euijoon Yoon, Yongjo Park, Ho-Won Jang, Sangmoon Yoon, Miyoung Kim, Young-Woon Kim
Summary: This study explores the relationship between atomic arrangement and luminescence properties in a high-quality α-Ga2O3 thin film on an Al2O3 single-crystal membrane. The strain induced by merging domain boundaries shows significant variability in annular darkfield images, despite no confirmed additional gallium concentration. The bandgap energy of α-Ga2O3 is estimated to be 5.56 eV from CL measurement in a transmission electron microscope. A peak at 320 nm is observed within the domain, while the domain boundary exhibits spectrum peaks at 380-480 nm. The formation of anti-phase domains (APD) is caused by the instabilities of Al-O bonding templates provided by the Al2O3 substrate. The APD boundary results in a characteristic wavelength of 350 nm, which arises from the merging boundary of in-phase and anti-phase domains.
Article
Materials Science, Multidisciplinary
Tuo Sheng, Xing-Zhao Liu, Ling-Xuan Qian, Bo Xu, Yi-Yu Zhang
Summary: Metal-semiconductor-metal solar-blind ultraviolet photoconductors based on beta-Ga2O3 thin films were fabricated and the effects of annealing on their characteristics and photoconductivity were studied. Higher annealing temperature resulted in lower crystalline quality and device photoresponsivity. The vacuum-annealed sample showed the highest photoresponsivity and the oxygen-annealed sample effectively suppressed persistent photoconductivity.
Article
Materials Science, Ceramics
Chen Wang, Wei-Hang Fan, Yu-Chao Zhang, Pin-Chun Kang, Wan-Yu Wu, Dong-Sing Wuu, Shui-Yang Lien, Wen-Zhang Zhu
Summary: This study investigated the properties of Sn-doped Ga2O3 films deposited on sapphire substrates through RF magnetron sputtering at different oxygen flow ratios. In situ optical emission spectroscopy was used to monitor the plasma radicals generated during the deposition process. The films showed amorphous structures with nanoparticles and a decreased deposition rate with increasing oxygen flow ratio. The conductive mechanism of the films was attributed to the ratio of substitutional Sn atoms and the SnO2 phase. Metal-semiconductor-metal solar-blind photodetectors were developed and analyzed to demonstrate the effect of oxygen flow ratio.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Yu Pei, Lingyan Liang, Xiaolong Wang, Zhenhua Wang, Hengbo Zhang, Junyan Ren, Hongtao Cao
Summary: By using seed-induced engineering, crystalline Ga2O3 material was successfully prepared at a lower processing temperature, showing promising performance in solarblind photodetectors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Xinxin Yu, Hehe Gong, Jianjun Zhou, Zhenghao Shen, Wenhui Xu, Tiangui You, Jian Wang, Shengnan Zhang, Yingmin Wang, Kai Zhang, Ran Tao, Yun Wu, Fang-Fang Ren, Xin Ou, Yuechan Kong, Zhonghui Li, Tangsheng Chen, Dunjun Chen, Shulin Gu, Youdou Zheng, Jiandong Ye, Rong Zhang
Summary: We present RF MOSFETs with a 2DEG-like channel formed at the beta-Ga2O3 surface through Si implantation and thermal activation. The shallowly implanted channel exhibits strong electron confinement with a high sheet concentration. The devices demonstrate high RF performance with high cut-off frequency and maximum oscillation frequency, and maintain high voltage operation capability.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Nikita Yakovlev, Aleksei Almaev, Pavel Butenko, David Tetelbaum, Alexey Mikhaylov, Alena Nikolskaya, Aleksei Pechnikov, Sergey Stepanov, Mikhail Boiko, Andrei Chikiryaka, Vladimir Nikolaev
Summary: The effect of Si+ ion implantation on the gas-sensing properties of (0001) alpha-Ga2O3 films grown by HVPE has been investigated. The results show that irradiation with a dose of 8 x 10(12) - 8 x 10(15) cm(-2) at an energy of 100 keV followed by postimplantation annealing significantly enhances the response of alpha-Ga2O3 films to 3 vol% of H-2 at 400 degrees C, reduces the response time by a factor of 6, and extends the operating temperature range to 30 degrees C. Additionally, alpha-Ga2O3 layers irradiated with a Si+ dose of 8 x 10(13) - 8 x 10(15) cm(-2) exhibit high sensitivity to CO and NH3 gases. A mechanism for the effect of Si+ ion irradiation on the gas-sensing properties of alpha-Ga2O3 structures is proposed.
IEEE SENSORS JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Gui-Sheng Zeng, Chi-Lung Liu, Sheng-Hui Chen
Summary: High-quality single-crystal-like Ge (004) thin films were successfully epitaxially grown on Si (001) substrates using radio-frequency magnetron sputtering, showing improved crystalline quality. These results have important applications in the fabrication of high-efficiency III-V solar cells and photodetectors.
Article
Materials Science, Multidisciplinary
Deyong Zheng, Huihui Jin, Yucong Liao, Pengxia Ji
Summary: In this study, a highly stable and efficient catalyst, fluorine-doped Co3O4 (F-Co3O4), was developed for hydrogen production by water electrolysis. The F-Co3O4 catalyst exhibited a remarkable reduction in overpotential and demonstrated excellent stability for over 100 hours.
Article
Materials Science, Multidisciplinary
Ziwen Lv, Jintao Wang, Fengyi Wang, Jianqiang Wang, Fuquan Li, Hongtao Chen
Summary: Adding Cu6Sn5 nano particles can effectively inhibit the overgrowth of intermetallic compounds at the interfaces of solder joints in electronic devices, providing a solution to this issue. A new growth mechanism of intermetallic compounds at the interfaces was identified.
Article
Materials Science, Multidisciplinary
Jun Wang, Jiawei Chen, Wanru Liao, Fangyang Liu, Min Liu, Liangxing Jiang
Summary: A BiOI/AgI/Ag plasmonic heterostructure photocathode was successfully designed through electrodeposition, ion-exchange, and illumination methods. This photocathode exhibits superior performance in photoelectrochemical water splitting.
Article
Materials Science, Multidisciplinary
Xiaoxiao Liu, Xianxian Zhou, Xiaotao Ma, Qinbo Yuan, Shibin Liu
Summary: In this study, the authors propose a method to accelerate the reaction of polysulfides in lithium-sulfur batteries using a Ni@OC Mott-Schottky heterojunction as a catalyst. The experimental results demonstrate that the charge redistribution at the Ni@OC interface accelerates electron transfer and enhances catalytic activity, leading to improved reaction kinetics and battery performance.
Article
Materials Science, Multidisciplinary
Dayou Ma, Mohammad Rezasefat, Joziel Aparecido da Cruz, Sandro Campos Amico, Marco Giglio, Andrea Manes
Summary: The matrix has a significant effect on the impact resistance of composite materials. Replacing a brittle polymer with a more flexible one can improve impact resistance, but it poses challenges to standard testing methods. This study designs a new fixture for testing the low-velocity impact of soft composites and investigates the effect of the fixture on the mechanical performance.
Article
Materials Science, Multidisciplinary
Lingchang Wang, Qihang Yang, Huzhen Li, Ming Wei, Qian Wang, Zhenzhong Hu, Mengmeng Zhen
Summary: Bronze titanium dioxide (TiO2(B)) is a promising anode material for lithium-ion batteries due to its high specific capacity. However, its practical applications are hindered by poor conductivity and limited electrochemical kinetics. In this study, TiO2(B)-carbon nanosheets heterostructures are synthesized to enhance the cycling performance and rate capability of TiO2(B).
Article
Materials Science, Multidisciplinary
Atul Thakur, Ritesh Verma, Ankush Chauhan, Fayu Wan, Preeti Thakur
Summary: In this study, BaFe12O19 and BaFe12O19: Epoxy (50:50) nanocomposites were synthesized using the co-precipitation method. The structural information and material properties, such as crystallite size and electrical conductivity, were characterized by XRD, FESEM, EDX, and TEM techniques.
Article
Materials Science, Multidisciplinary
Jingyu Wu, Xinyan Ma, Yong Yang
Summary: A well-defined CoS2@NC(CS-500) hierarchical binder-free catalyst cathode is constructed through in-situ grown of ZIF-67 on carbon cloth and high-temperature carbonization. The cathode shows excellent reaction kinetics and electrochemical performance, providing inspiration for developing advanced Li-CO2 battery catalysts.
Article
Materials Science, Multidisciplinary
Svetlana M. Posokhova, Vladimir A. Morozov, Kirill N. Boldyrev, Dina Deyneko, Erzhena T. Pavlova, Bogdan I. Lazoryak
Summary: This study explores the impact of synthesis method and composition on the structure and luminescence properties of K5Eu1-xHox(MoO4)4 with the palmierite-type matrix. The co-doping of Eu3+ and Ho3+ ions plays a critical role in manipulating charge transfer and luminescence efficiency in the visible and infrared regions.
Article
Materials Science, Multidisciplinary
Jian Wang, Yeting Tao, Jingsheng Wang, Youtian Tao
Summary: A new electron-transport material iTPyBI-CN is developed through non-catalytic C-N coupling reaction. It exhibits better electroluminescence efficiency in organic light-emitting diodes compared to the commercial material TPBI, due to its twisted geometry and higher energy levels.
Article
Materials Science, Multidisciplinary
Tao Zhu, Feng Huang, Shuo Li, Yang Zhou
Summary: This article combines XRD analysis and microscopic structural observation to investigate the changes in limestone after high-temperature treatment. It finds that 500 degrees C is the critical temperature for crystalline and spatial arrangement changes in limestone, and the thermal conductivity, specific heat capacity, and heat storage coefficient gradually decrease after thermal treatment.
Article
Materials Science, Multidisciplinary
Muhammad Haekal Habibie, Fransiska Sri Herwahyu Krismastuti, Abdi Wira Septama, Faiza Maryani, Vivi Fauzia
Summary: This study focuses on the synthesis of zinc oxide nanostructure from zinc recovered from galvanization ash and highlights its potential as a sustainable source of zinc and as an antibacterial agent.
Article
Materials Science, Multidisciplinary
Jingyi Li, Yixin Xing, Wei Gu, Shousi Lu
Summary: In this study, PC@CaP microparticles were fabricated using biomimetic mineralization. The results showed that under environmental stress, PC@CaP exhibited improved stability and antioxidative activity, indicating its potential use in high-added value fields.
Article
Materials Science, Multidisciplinary
Yan Liu, Shunyou Chen
Summary: In this study, TNTs were used as a drug carrier and modified with ZIF-8 and silk fibroin to obtain a new drug loading platform. The results showed that this drug-loaded platform had a good drug release effect in vitro and could promote cell proliferation and osteogenic differentiation.
Article
Materials Science, Multidisciplinary
Chunhui Zhu, Wentao Wang, Qing Zhen, Xinning Huang, Shixin Li, Shaochang Wang, Xiaoping Ma, Xiaoxia Liu, Yalong Jiao, Kai Sun, Zhuangzhi Li, Huaixin Yang, Jianqi Li
Summary: A type of stacking fault is revealed in e-InSe crystal, which is associated with a small stacking-fault energy and shows exceptional plasticity.