Article
Engineering, Electrical & Electronic
Kazuki Shimazoe, Hiroyuki Nishinaka, Keisuke Watanabe, Masahiro Yoshimoto
Summary: In this study, rh-ITO thin films with different Sn concentrations were successfully grown using the mist chemical vapor deposition method. The films exhibited low resistivity, high transmittance, and can be used as transparent conductive oxide materials.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Haizheng Hu, Chao Wu, Nie Zhao, Zhiyan Zhu, Peigang Li, Shunli Wang, Weihua Tang, Daoyou Guo
Summary: The epitaxial growth of Ga2O3 thin films on different oriented sapphire substrates was studied, showing that films grown on c-plane substrate exhibited the best crystallinity and smooth surface, while those on r-plane substrate exhibited the fastest growth rate. The photodetector based on the c-plane grown Ga2O3 film had the lowest dark current, highest I-light/I-dark ratio, and fastest response time, while the film grown on m-plane showed the highest responsivity.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Ray-Hua Horng, Dong-Sing Wuu, Po-Liang Liu, Apoorva Sood, Fu-Gow Tarntair, Yu-Hsuan Chen, Singh Jitendra Pratap, Ching -Lien Hsiao
Summary: In this study, monoclinic gallium oxide (beta-Ga2O3) epilayer was successfully grown on a sapphire substrate by MOCVD. Controlling the growth temperature, TEGa flow rate, and growth time improved the crystallization characteristics of the epilayers. However, it also increased the surface roughness of beta-Ga2O3 film. The growth mechanism and chemical reactions between TEGa and oxygen precursors were analyzed.
MATERIALS TODAY ADVANCES
(2022)
Review
Materials Science, Multidisciplinary
Aadil Waseem, Zhongjie Ren, Hsien-Chih Huang, Kristen Nguyen, Xihang Wu, Xiuling Li
Summary: This review discusses the recent progress in epitaxial growth of beta-Ga2O3 films and highlights challenges in obtaining high growth rate, low defects, and high carrier mobilities. Compared with other methods, MOCVD offers a wider growth window and precursor selection option. The choice of MOCVD precursors, nucleation, and adsorption/desorption/diffusion of adatoms on substrate surfaces can affect growth defects, background impurity incorporation, and carrier mobilities.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Hiroyuki Nishinaka, Tatsuji Nagaoka, Yuki Kajita, Masahiro Yoshimoto
Summary: Utilizing mist chemical vapor deposition (CVD) process, rapid homoepitaxial growth of beta-Ga2O3 thin films with smooth surfaces was achieved using a concentrated aqueous solution of GaCl3 precursor.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Daniela Gogova, Misagh Ghezellou, Dat Q. Tran, Steffen Richter, Alexis Papamichail, Jawad ul Hassan, Axel R. Persson, Per O. a. Persson, Olof Kordina, Bo Monemar, Matthew Hilfiker, Mathias Schubert, Plamen P. Paskov, Vanya Darakchieva
Summary: The hot-wall MOCVD concept is applied to the epitaxial growth of beta-Ga2O3, resulting in high crystalline quality epitaxial layers. The results demonstrate the potential of hot-wall MOCVD as a method for the fabrication of beta-Ga2O3.
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, Physical
Weiqu Chen, Zimin Chen, Zeqi Li, Zeyuan Fei, Yanli Pei, Gang Wang, Zhiyuan He
Summary: High quality epsilon-phase gallium oxide (Ga2O3) thin films have been successfully grown on silicon substrates using metal-organic chemical vapor deposition (MOCVD). The growth pressure is found to be an important parameter that affects the thin film quality.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Ceramics
Xiao Tang, Kuang-Hui Li, Che-Hao Liao, Jose Manuel Taboada Vasquez, Chuanju Wang, Na Xiao, Xiaohang Li
Summary: The study presents a novel CSD technique for depositing highly epitaxial indium and aluminum-doped Ga2O3 thin films, showing pure beta phase with good crystallization qualities. The incorporation of indium and aluminum shifts the crystallization of the thin films to lower and higher temperatures, respectively, and the bandgap of the sintered thin films can be tuned from 4.05 to 5.03 eV using mixed precursor solutions. Photodetectors based on the samples exhibit maximum photocurrents at different wavelengths, suggesting potential for producing high-quality bandgap tunable deep ultraviolet photoelectrical and high-power devices.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Ruinan Wu, Yueguo Hu, Peisen Li, Junping Peng, Jiafei Hu, Ming Yang, Dixiang Chen, Yanrui Guo, Qi Zhang, Xiangnan Xie, Jiayu Dai, Weicheng Qiu, Guang Wang, Mengchun Pan
Summary: This study focuses on improving the tunnel magnetoresistance effect in magnetic tunnel junctions by growing high-quality graphene on Ni(111) substrates. Through APCVD, a high-quality graphene/Ni(111) heterostructure with an atomically sharp interface was successfully fabricated, providing a new approach for interface engineering in 2D spintronic applications.
Article
Materials Science, Multidisciplinary
Fan Liu, Naoto Nishioka, Fumio Ogawa, Toshiyuki Hashida
Summary: This study discusses the growth mechanism of epitaxial PyC layers on CNT surfaces achieved by low-pressure ethylene pyrolysis, distinct from previous studies using higher gas pressures. The average thickness of deposited PyC layers is calculated by analyzing TEM images, and the crystallinity is evaluated by Raman spectroscopy and X-ray diffraction. A two-stage nonlinear behavior in the growth kinetics of PyC layers is found, indicating the influence of surface active sites on the radial growth rate.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Kyung Yeol Ma, Leining Zhang, Sunghwan Jin, Yan Wang, Seong In Yoon, Hyuntae Hwang, Juseung Oh, Da Sol Jeong, Meihui Wang, Shahana Chatterjee, Gwangwoo Kim, A-Rang Jang, Jieun Yang, Sunmin Ryu, Hu Young Jeong, Rodney S. Ruoff, Manish Chhowalla, Feng Ding, Hyeon Suk Shin
Summary: Large-area single-crystal trilayer hBN has been successfully grown using a chemical vapour deposition (CVD) method. The hBN film acts as a protective layer and shows potential in the fabrication of 2D semiconductors.
Article
Nanoscience & Nanotechnology
Mahitosh Biswas, Hiroyuki Nishinaka
Summary: The translation elaborates on the properties and growth of gallium oxide (Ga2O3) and its metastable phases, and discusses their doping and electronic properties. The importance of these phases in power electronics and ultraviolet photodetectors is emphasized.
Article
Materials Science, Multidisciplinary
Ray-Hua Horng, Apoorva Sood, Siddharth Rana, Niall Tumity, Fu-Gow Tarntair, Catherine Langpoklakpam, Hao-Chung Kuo, Jitendra Pratap Singh
Summary: Conductive β-Ga2O3 epilayers grown on the sapphire substrate using MOCVD were studied by Si-ion implanted. A metal-insulator-semiconductor diode (MISD) was fabricated using undoped and Si-implanted β-Ga2O3 epitaxial layer. The electrical and carrier transport properties of different MISD with different distance between cathode and anode contact were investigated.
MATERIALS TODAY ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Takahiro Kato, Hiroyuki Nishinaka, Kazuki Shimazoe, Masahiro Yoshimoto
Summary: Epitaxial delta-Ga2O3 thin films were successfully grown on various planes of YSZ and c-plane sapphire substrates by inserting beta-Fe2O3 and bcc-In2O3 buffer layers. The growth involved reducing lattice mismatch and exploring the thermal stability of the buffer layers. Furthermore, the growth of both alpha- and delta-Ga2O3 thin films on c-plane sapphire was achieved using specific buffer layers.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
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.