Article
Materials Science, Multidisciplinary
Vijay Gopal Thirupakuzi Vangipuram, Kaitian Zhang, Hongping Zhao
Summary: The effects of carbon incorporation in GaN grown with different growth techniques and offcut angles were investigated. It was found that a higher offcut angle led to a significant reduction in carbon incorporation.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Yuxuan Zhang, Zhaoying Chen, Kaitian Zhang, Zixuan Feng, Hongping Zhao
Summary: This study introduces a laser-assisted MOCVD growth technique to address the high-carbon issue in MOCVD GaN, achieving high-quality GaN epitaxy with low carbon and fast growth rate simultaneously. The technique shows promising results for epitaxy of nitride-based semiconductors.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Crystallography
Peng Su, Daihui Lu, Jinping Luo, Guangyu Zheng, Yukang Sun, Lijun Liu
Summary: Nanoparticles have a negative effect on the preparation of Gallium Nitride (GaN) by Metal-Organic Chemical Vapor Deposition (MOCVD). The study investigates the movement and deposition of nanoparticles in single-wafer and multi-wafer reactors using a particle tracking and particle-wall collision model. The results show that in the single-wafer reactor, particles do not deposit on the reactor wall and susceptor but move endlessly within the reactor, which should be avoided. In multi-wafer reactors, nanoparticles are deposited near the axis, and those beyond a certain position from the axis are trapped in a vortex above the receptor, resulting in more complex by-products.
Article
Chemistry, Multidisciplinary
Assael Cohen, Avinash Patsha, Pranab K. Mohapatra, Miri Kazes, Kamalakannan Ranganathan, Lothar Houben, Dan Oron, Ariel Ismach
Summary: The GE-MOCVD approach improves domain size and crystal quality compared to traditional MOCVD, demonstrating potential for wide integration into various applications.
Article
Chemistry, Multidisciplinary
Cai Zhang, Xin Jin, Yan Liang, Liu Yang, Jing Li, Rui Wang, Baodan Liu, Xuewei Lv, Xin Jiang
Summary: This study demonstrates the growth of homogeneous and well-aligned [0001]-oriented 1-D GaN nanoarrays through a modified hydride vapor phase epitaxy (HVPE) process. The technique allows for easy control of nanowire density and length, providing Cl-rich growth conditions that result in unique morphology and optical properties of the GaN nanoarrays. The as-synthesized GaN nanoarrays exhibit a hollow bamboo-like structure and show strong visible luminescence, centered at 450 nm with the disappearance of an intrinsic emission peak.
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
Chemistry, Multidisciplinary
Asha Yadav, Bo Fu, Stephanie Nicole Bonvicini, Linh Quy Ly, Zhitai Jia, Yujun Shi
Summary: beta-Ga2O3 nanostructures with different morphologies, including nanowires, nanosheets, and nanorods, were successfully synthesized using thermally dewetted Au nanoparticles as catalysts. The growth of the nanostructures was found to be governed by different mechanisms, with the vapor-liquid-solid mechanism governing nanowire growth and the vapor-solid mechanism occurring in the growth of nanosheets and nanorods. The as-grown beta-Ga2O3 nanostructures exhibited high purity, wide bandgap, and strong photoluminescence emission, making them promising for applications in optoelectronic devices such as tunable UV-Vis photodetectors.
Article
Materials Science, Multidisciplinary
Vishal Saravade, Zahra Manzoor, Alexis Corda, Chuanle Zhou, Ian Ferguson, Na Lu
Summary: This study investigates the optical properties and process-structure-property relationships of Mn-doped zinc oxide grown using metal-organic chemical vapor deposition with varying Mn-doping concentration and growth conditions. The results show that Mn-doping can alter the bandgap and photoluminescence characteristics of ZnMnO.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Physical
Qinke Wu, Taehwan Jeong, Seong Heon Kim, Young Jae Song
Summary: This study presents a quick and simple method to grow high quality two-dimensional graphitic carbon nitride nanosheets with a large domain size on copper foils. The research demonstrates that graphitic carbon nitride prefers a Cu(111) surface for growth and highlights the importance of using a carrier gas, with noble Ar gas recommended for its weaker etching effect compared to hydrogen gas. Furthermore, high-quality graphitic carbon nitride films grown by CVD can be easily transferred onto other substrates for various applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Xianghui Zeng, Hui Chen, Jinfeng Wu, Wei Fang, Xing Du, Xuan He, Daheng Wang, Weixin Li, Lei Zhao
Summary: In this study, vertically aligned BNNSs were synthesized without any substrates using Fe-catalyzed thermal chemical vapor deposition method. The BNNSs exhibited improved crystallinity, high UV light emission, and excellent anti-oxidation behavior due to their unique structures. This environmentally friendly synthesis method allows for exploration of industrial upscaling applications.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Yang Wang, Yunfei Niu, Jiaqi Yu, Lidong Zhang, Haotian Ma, Yusen Wang, Chao Lu, Gaoqiang Deng, Baolin Zhang, Yuantao Zhang
Summary: In this study, high-quality N-polar GaN films were successfully grown on vicinal c-plane sapphire substrates using a two-step high-temperature growth method. The approach effectively resolved the conflict between surface morphology and crystalline quality.
Article
Materials Science, Multidisciplinary
Min Joo Ahn, Kyu-yeon Shim, Woo Seop Jeong, Seongho Kang, Hwayoung Kim, Dae-sik Kim, Junggeun Jhin, Jaekyun Kim, Dongjin Byun
Summary: In this study, a polished plateau-patterned sapphire substrate (PP-PSS) was developed for the epitaxial growth of stress-free GaN microrods. By adjusting the polishing time, selective growth of GaN microrods was achieved on the plateau region of the substrate. The growth mechanism and crystal structure of the GaN microrods were characterized, confirming the feasibility of stress-free epitaxial growth on PP-PSS.
Article
Physics, Condensed Matter
Anelia Kakanakova-Georgieva, Alexis Papamichail, Vallery Stanishev, Vanya Darakchieva
Summary: In this study, Mg-doped GaN layers were grown using metal-organic chemical vapor deposition (MOCVD) and it was found that the incorporation of magnesium into GaN can be significantly controlled by large amounts of hydrogen during the MOCVD growth, resulting in the coexistence of MgH complexes with dominant electrically active isolated Mg-Ga acceptors.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Physics, Condensed Matter
Bela Pecz, Miklos Nemeth, Filippo Giannazzo, Anelia Kakanakova-Georgieva
Summary: The possibility of creating a certain periodic 2D structure through Si-N bonds under epitaxial graphene on SiC (0001) is reported, using metal-organic chemical vapor deposition processes and direct heat treatment of epitaxial graphene in ammonia flow. The result is of interest due to its compatibility with semiconductor material deposition technologies and potential use in nanoscience and nanotechnology.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Riccardo Torsi, Kyle T. Munson, Rahul Pendurthi, Esteban Marques, Benoit Van Troeye, Lysander Huberich, Bruno Schuler, Maxwell Feidler, Ke Wang, Geoffrey Pourtois, Saptarshi Das, John B. Asbury, Yu-Chuan Lin, Joshua A. Robinson
Summary: In this work, we successfully demonstrate substitutional rhenium (Re) doping of MoS2 monolayers with controllable concentrations down to 500 ppm by metal-organic chemical vapor deposition (MOCVD). We find that even trace amounts of Re can significantly reduce sulfur site defect density and suppress defect photoluminescence (PL) commonly seen in undoped MOCVD MoS2. Moreover, Re-MoS2 transistors exhibit improved carrier transport and device performance compared to undoped MoS2.
Article
Acoustics
S. P. Bardakhanov, C-M Lee, V. N. Goverdovskiy, A. P. Zavjalov, K. Zobov, M. Chen, Z. H. Xu, I. K. Chakin, D. Yu Trufanov
Article
Psychiatry
Soo-young Bhang, Jaekook Yoon, Joohyun Sung, Cheolin Yoo, Changsun Sim, Changmyung Lee, Jaewon Lee, Jiho Lee
PSYCHIATRY INVESTIGATION
(2018)
Article
Acoustics
Huan-Yu Dong, Chang-Myung Lee
EURASIP JOURNAL ON AUDIO SPEECH AND MUSIC PROCESSING
(2018)
Article
Engineering, Manufacturing
Dinh Son Nguyen, Hong Seok Park, Chang Myung Lee
MATERIALS AND MANUFACTURING PROCESSES
(2019)
Article
Acoustics
Guang-Quan Hou, Chang-Myung Lee
SHOCK AND VIBRATION
(2019)
Article
Engineering, Mechanical
Chang-Myung Lee, Vladimir Goverdovskiy
INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY
(2019)
Article
Chemistry, Multidisciplinary
Peng Wang, Chang-Myung Lee
APPLIED SCIENCES-BASEL
(2019)
Article
Chemistry, Multidisciplinary
Qi Wu, Chang-Myung Lee
APPLIED SCIENCES-BASEL
(2019)
Article
Chemistry, Multidisciplinary
Dinh-Son Nguyen, Hong-Seok Park, Chang-Myung Lee
APPLIED SCIENCES-BASEL
(2019)
Article
Automation & Control Systems
Risky Ayu Febriani, Hong-Seok Park, Chang-Myung Lee
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2020)
Article
Engineering, Manufacturing
Dinh Son Nguyen, Hong Seok Park, Chang Myung Lee
JOURNAL OF MANUFACTURING PROCESSES
(2020)
Article
Chemistry, Multidisciplinary
Risky Ayu Febriani, Hong-Seok Park, Chang-Myung Lee
APPLIED SCIENCES-BASEL
(2020)
Article
Chemistry, Multidisciplinary
Hang Su, Chang-Myung Lee
Summary: This paper introduces a modified GSC method to reduce distortion in both residual acoustic noise and the desired audio signal when the desired signal is a non-stationary speech signal. Experimental results show that the proposed method is effective in reducing distortion under various SNR conditions.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Min Chen, Chang-Myung Lee
Summary: The GBSS algorithm is utilized for optimizing the noise reduction process, aiming to achieve the best dynamic range improvement and reduce estimation errors in RT caused by noise levels.
APPLIED SCIENCES-BASEL
(2021)
Article
Construction & Building Technology
Min Chen, Chang-Myung Lee
Summary: The aim of this paper is to improve the estimation of reverberation time (RT). An iterative process based on a non-exponential decay model is proposed to accurately estimate the truncation time (TT) and enhance the accuracy of RT estimation. The effectiveness of the method is verified by comparing the decay rates of energy decay curves (EDCs) under different background noise conditions.
Article
Materials Science, Multidisciplinary
Honggyun Kim, Jamal Aziz, Vijay D. Chavan, Deok-kee Kim
Summary: Silicon nitride films were prepared using plasma enhanced chemical vapor deposition with different trap densities induced by adjusting the RF power ratio. It was found that the film's trap density was lowest under compressive stress and increased under tensile stress. This study has significant implications for the formation of durable nitride films in various electronic and optoelectronic applications.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Qiang Yu, Huwei Zhao, Yue Zhao
Summary: Zinc oxide thin films and Al-doped zinc oxide films were prepared and characterized in this study. The addition of Al ions was found to change the growth orientation, increase the grain size, and enhance the absorption intensity in the visible light region. Furthermore, the addition of Al ions also increased the forward current in the heterojunction.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Sang Woo Lee, Min Sun Park, Sangwon Wi, So Yeon Lim, Yeseul Lee, Jin-Seok Chung, Sang Mo Yang
Summary: In this study, we investigated the dynamics of domain switching in pristine and fatigued BiFeO3 capacitors through experimental observations and measurements. The results showed that the switching in the pristine capacitors was dominantly driven by domain growth, while the fatigued capacitors exhibited two different switching dynamics, in which nucleation played a critical role.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Boshi Wang, Tianyi Wang, Yufang Liu, Kun Yu
Summary: In this paper, a tunable and anisotropic perfect absorber composed of anisotropic black phosphorus (BP) and isotropic graphene is proposed. The structure exhibits high absorption and strong anisotropic plasma response. The resonance characteristics can be effectively controlled by adjusting geometric parameters and doping levels, offering potential applications.
CURRENT APPLIED PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Xiaolan Liu, Chunyang Li, Tonghui Yang, Naiqiang Yin, Gangling Zhao
Summary: Water drop triboelectric nanogenerators (WD-TENGs) can harvest energy from raindrops and improve the output performance of TENGs.
CURRENT APPLIED PHYSICS
(2024)
