Article
Engineering, Electrical & Electronic
Shivam Sharma, Lingyu Meng, A. F. M. Anhar Uddin Bhuiyan, Zixuan Feng, David Eason, Hongping Zhao, Uttam Singisetti
Summary: This letter presents the vacuum annealing of lateral field-plated beta-Ga2O3 MOSFETs, which leads to significant current recovery and improvement in the on-state resistance after damage induced by Reactive Ion Etching (RIE). MOSFETs based on Molecular Beam Epitaxy (MBE) and Metal-Organic Chemical Vapor Deposition (MOCVD) grown beta-Ga2O3 wafers are fabricated and characterized to study the effects of vacuum annealing. It is observed that vacuum annealed devices show no reduction in breakdown voltages compared to polymer passivated MOSFETs, and the devices exhibit up to 10 times reduction in on-state resistance compared to previously reported SU-8 passivated devices.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Yibo Wang, Hehe Gong, Xiaole Jia, Jiandong Ye, Yan Liu, Haodong Hu, Xin Ou, Xiaohua Ma, Rong Zhang, Yue Hao, Genquan Han
Summary: This study demonstrates the first beta-Ga2O3 lateral superjunction (SJ)-equivalent metal-oxide-semiconductor field-effect transistors (MOSFETs). The SJ structure is constructed by the selective epitaxial filling of p-NiO pillars into the trenched drift region of beta-Ga2O3. Experimental results show that the Ga(2)O(3) SJ-equivalent MOSFETs outperform the control transistor and exhibit improved breakdown voltage and power figure-of-merit. The charge imbalance caused by substrate-assisted depletion effect and interfacial charges is identified as the reason for the deviation from theoretical predictions.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Chemistry, Physical
Yeong Je Jeong, Jeong Yong Yang, Chan Ho Lee, Ryubin Park, Gyeongryul Lee, Roy Byung Kyu Chung, Geonwook Yoo
Summary: The electrical characteristics of beta-Ga2O3 film were significantly improved using CF4 plasma treatment, allowing the MOSFET to exhibit improved field-effect mobility and on/off ratio. The incorporation of fluorine enhanced both surface and bulk properties of the material, leading to successful ohmic contact formation without post-thermal annealing.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Samuel H. Kim, Daniel Shoemaker, Bikramjit Chatterjee, Andrew J. Green, Kelson D. Chabak, Eric R. Heller, Kyle J. Liddy, Gregg H. Jessen, Samuel Graham, Sukwon Choi
Summary: This study investigates the impact of thermal management strategies on the performance of beta-Ga2O3 transistors. The experimental results demonstrate the importance of considering the anisotropic thermal conductivity of the material and the geometrical design of the metal electrodes/interconnects in device layout design to maximize both electrical and thermal performance.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Materials Science, Ceramics
Xu Dai, Xi Zhang, Gang Xiang
Summary: Mn-doped beta-Ga2O3 films with room-temperature ferromagnetism were synthesized and the effects of annealing atmosphere on their properties were investigated. The study found that oxygen vacancy plays a crucial role in the modulation of ferromagnetism.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Electrical & Electronic
Animesh Datta, Uttam Singisetti
Summary: In this article, we investigate the Single-Event Effects (SEEs) that lead to Single-Event Burnout (SEB) in fi-Ga2O3 MOSFETs. Through simulations, we find that high electric fields in the channel play a critical role in SEB occurrence. Radiation-hardened designs, such as rounded gates and high-permittivity (k) dielectrics, are proposed to reduce the electric field and increase the SEB threshold. By using HfO2-SiO2 or BaTiO3-SiO2 dielectric combinations, higher SEB thresholds can be achieved. The energy dissipation during ion strike events is also calculated, showing lower values compared to SiC MOSFETs.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Qiming He, Xuanze Zhou, Qiuyan Li, Weibing Hao, Qi Liu, Zhao Han, Kai Zhou, Chen Chen, Jinlan Peng, Guangwei Xu, Xiaolong Zhao, Xiaojun Wu, Shibing Long
Summary: Selective high-resistance zones were successfully achieved on beta-Ga2O3 wafers using a high-temperature oxygen annealing process. Polysilicon was employed as an annealing cap layer to prevent local carrier concentration changes during annealing. Additionally, a high-resistance anode edge termination of Schottky barrier diodes was demonstrated, leading to reduced leakage current and increased breakdown voltage.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Physics, Applied
Vishal Khandelwal, Saravanan Yuvaraja, Glen Isaac Maciel Garcia, Chuanju Wang, Yi Lu, Feras AlQatari, Xiaohang Li
Summary: In this Letter, a monolithically integrated β-Ga2O3 NMOS inverter integrated circuit (IC) based on heteroepitaxial enhancement mode (E-mode) β-Ga2O3 MOSFETs on low-cost sapphire substrates is reported. A gate recess technique is employed for E-mode operation, showing an on-off ratio of about 10^5 and a threshold voltage of 3 V. Depletion-load NMOS inverter ICs are fabricated by integrating D-mode and E-mode transistors on the same substrate, demonstrating inverter logic operation with a voltage gain of 2.5 at V-DD = 9 V.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Ling-Xuan Qian, Zhiwen Gu, Xiaodong Huang, Hongyu Liu, Yuanjie Lv, Zhihong Feng, Wanli Zhang
Summary: This study presents a metal-semiconductor-metal photodetector with a beta-Ga2O3 homojunction structure achieved by low-energy surface fluorine plasma treatment for surface passivation. The fluorine dopants were used to passivate oxygen vacancies and suppress surface chemisorption, resulting in an improvement in both dark and photo current characteristics. The sensitivity was enhanced by nearly 1 order of magnitude, showcasing competitive comprehensive properties for beta-Ga2O3 solar-blind metal-semiconductor-metal photodetectors.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Manuel Fregolent, Enrico Brusaterra, Carlo De Santi, Kornelius Tetzner, Joachim Wurfl, Gaudenzio Meneghesso, Enrico Zanoni, Matteo Meneghini
Summary: We have presented a detailed model of the gate leakage current in lateral b-Ga2O3 MOSFETs with an Al2O3 gate insulator, covering a wide temperature range. Our results show that the current originates from Poole-Frenkel conduction in forward bias at high temperature and from Fowler-Nordheim tunneling at low temperature. We have also modeled the gate current transient during constant gate stress, which is attributed to electron trapping in deep levels in the oxide.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Manuel Fregolent, Enrico Brusaterra, Carlo De Santi, Kornelius Tetzner, Joachim Wuerfl, Gaudenzio Meneghesso, Enrico Zanoni, Matteo Meneghini
Summary: This paper extensively characterizes and models the threshold voltage instability in lateral beta-Ga2O3 MOSFETs with Al2O3 gate dielectric. It is found that the instability is caused by electron trapping at gate dielectric border traps near the Al2O3/beta-Ga2O3 interface. Logarithmic kinetics were detected for both stress and recovery processes using an innovative fast-capacitance experimental setup, and a generalized model that accurately reproduces the experimental results is proposed.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Xiang Zheng, Taylor Moule, James W. Pomeroy, Masataka Higashiwaki, Martin Kuball
Summary: A new method for measuring temperature in semiconductor devices is proposed in this study, with a focus on minimizing the interference from trapping effects. Results show that there is a certain degree of error in the channel temperature measured using drain current, with the actual channel temperature being the average value between the source and drain contacts.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Zhenghao Shen, Wenhui Xu, Yang Xu, Hao Huang, Jiajie Lin, Tiangui You, Jiandong Ye, Xin Ou
Summary: The study demonstrates that oxygen annealing plays a significant role in modulating the performance of PDs, with improvements in dark current reduction, responsivity rejection ratio enhancement, and external quantum efficiency increase after oxygen annealing treatment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
Xinyi Xia, Jian-Sian Li, Chao-Ching Chiang, Timothy Jinsoo Yoo, Fan Ren, Honggyu Kim, S. J. Pearton
Summary: The band alignment of sputtered NiO on beta-Ga2O3 was measured using x-ray photoelectron spectroscopy for different annealing temperatures. The results showed that the band alignment is type II, with the magnitude of the conduction and valence band offsets increasing with annealing temperature. Additionally, the bandgap of NiO decreased with increasing annealing temperature.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Minghao He, Kangyao Wen, Chenkai Deng, Mujun Li, Yifan Cui, Qing Wang, Hongyu Yu, Kah-Wee Ang
Summary: In this study, a normally-OFF β-Ga2O3 MOSFET with a charge trapping layer (CTL) was demonstrated for the first time. The CTL consists of Al:HfOx 1:5 and the tunneling barrier (TB) is Al2O3/HfOx/Al2O3 stack. The developed Ga2O3 MOSFET exhibited a wide Vth tuning range for normally-OFF operation and a long-lasting retention characteristic (-0.3 V for ten years). The device showed a breakdown voltage (BV) of 1815 V, indicating high reverse blocking capability based on the proposed CTL technique.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Spectroscopy
Xiaoli Li, Zhaoshui Yu, Jinli Xu, Yanshan Pan, Wei Bo, Bin Liu, Pengpeng Zhang, Jinfeng Bai, Qin Zhang
Summary: A new sample preparation technique using high pressure pressed pellet and coated with a polyester film is proposed for major and trace element determination in geochemical samples by wavelength dispersive X-ray fluorescence spectrometer. The accuracy of the method is evaluated using calibration curves created with reference materials and certified reference materials.
X-RAY SPECTROMETRY
(2023)
Article
Statistics & Probability
Jingfei Zhang, Will Wei Sun, Lexin Li
Summary: In this article, a new generalized matrix response regression model is proposed for the analysis of multiple-subject network data. The model characterizes the connectivity pattern of the network data and the effect of subject covariates through a low-rank intercept matrix and a sparse slope tensor, respectively. An efficient parameter estimation algorithm is developed, and an error bound for the estimator's accuracy is established. The efficacy of the method is demonstrated through simulations and brain connectivity studies.
JOURNAL OF COMPUTATIONAL AND GRAPHICAL STATISTICS
(2023)
Article
Chemistry, Medicinal
Jingjing Zhang, Hualing Zhu, Lixia Xiong, Jun Shi, Zhiqiang Huang
Summary: By designing and synthesizing benzoylureas analogues with carbamate groups, it was found that these compounds exhibited good larvicidal activities against a broad spectrum of insects such as oriental armyworm, diamondback moth, and mosquito. One compound (3g) showed the highest insecticidal activity against oriental armyworm.
LETTERS IN DRUG DESIGN & DISCOVERY
(2023)
Article
Gastroenterology & Hepatology
Andrew D. Schreiner, Jingwen Zhang, William P. Moran, David G. Koch, Justin Marsden, Sherry Livingston, Patrick D. Mauldin, Mulugeta Gebregziabher
Summary: This study aims to investigate the association between FIB-4 risk strata and the incidence of severe liver disease (SLD) in primary care patients without known chronic liver disease (CLD). The results indicate that indeterminate and high-risk FIB-4 strata are associated with an increased incidence of SLD.
LIVER INTERNATIONAL
(2023)
Article
Oncology
Chao Xu, Xiaoli Xie, Ning Kang, Huiqing Jiang
Summary: The study investigated the efficacy and safety of neoadjuvant S-1 plus oxaliplatin combined with PD-1 inhibitor and apatinib (SOXPA) in locally advanced gastric cancer (LAGC) patients. The results showed that this treatment achieved satisfactory clinical response, pathological response, survival profile, and manageable safety in LAGC patients.
JOURNAL OF CANCER RESEARCH AND CLINICAL ONCOLOGY
(2023)
Article
Medicine, General & Internal
Meghan K. Thomas, Marc E. Heincelman, Jingwen Zhang, Justin Marsden, Jennifer Dulin, Patrick Robbins, Kelly Hunt, Patrick Mauldin, William P. Moran, Benjamin Kalivas
Summary: Patients admitted via interhospital transfer are more likely to experience in-hospital delirium, leading to increased mortality, length of stay, and discharge to facility. Routine screening and intervention prior to patient transfer are emphasized.
JOURNAL OF INVESTIGATIVE MEDICINE
(2023)
Article
Materials Science, Ceramics
Yanling Cheng, Haoxian Huang, Xinxin Xi, Yuqiang Deng, Hainan Zhang, Chengyong Wang, Huatay Lin
Summary: Al flake addition significantly improves the properties of vinyl-polysilazane based photo-curable resin derived ceramics (P-PDCs), reducing macroscopic cracking and micrometer voids. Pyrolyzed P-PDCs with 0.6 wt% Al flake content exhibit the highest Vickers hardness and bending strength. Nano-indentation measurements show increased elastic modulus and indentation hardness with increasing Al flake content. During pyrolysis, the reacted Al flake forms hollow lamellar Al2O3 phases, enhancing both the mechanical properties and gas release.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Fisheries
Pingping Li, Haihong Chen, Jingyu Zhang, Xiaoqing Feng, Baoheng Xiao, Yiyi Hu, Zhenghong Sui
Summary: In recent years, changes in the concentrations and compositions of nutrients in the ocean have negatively affected the biomass and quality of macroalgae. A strain of Gracilariopsis lemaneiformis with a curly branch phenotype has been discovered in China, causing negative impacts on the cultivation industry. The abnormality of this strain is correlated with the concentration of nitrogen and phosphorus, and certain biological processes are down-regulated compared to the normal strain.
Article
Cell Biology
Shuang Hao, Jingchao Zhang, Yu Pei, Longhui Guo, Zhenxing Liang
Summary: This study found that epicardial adipose tissue (EAT) mediates cardiomyocyte apoptosis after acute myocardial infarction (MI) through secretion of complement factor D (CFD) and activation of PARP-1 activity. This discovery offers key targets for intervention in acute MI.
CELLULAR SIGNALLING
(2023)
Article
Chemistry, Physical
Shuxiang Wen, Xin Li, Jingjing Zhang, Jie Wang, Hao Ding, Ningshuang Zhang, Dongni Zhao, Liping Mao, Shiyou Li
Summary: This study investigates the compatibility of Na2Ti3O7@C anode material with sodium perchlorate (NaClO4)-based and sodium trifluoromethyl sulfonate (NaCF3SO3)-based electrolytes in sodium ion batteries (SIBs). The results reveal that the NaCF3SO3-based electrolyte forms a thin, compact, and uniform solid electrolyte interphase (SEI) film, which reduces the transmission energy barrier of Na+ and improves the cycling and rate performance of batteries. In contrast, the NaClO4-based electrolyte leads to the formation of a thicker SEI film containing Na(2)CO(3) and NaF, resulting in higher interface impedance and decreased battery cycle performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Green & Sustainable Science & Technology
Feng Liu, Qingwen Long, Guiquan Che, Zhihao Zhang, Mick Cooper, Jing Zhang, Gang Pan, Wentao Jiao
Summary: In this study, a novel method of coating polyelectrolytes on holey graphene oxide was used to modify the surface charge of the membrane, resulting in improved water flux and desalination performance.
JOURNAL OF CLEANER PRODUCTION
(2023)
Editorial Material
Surgery
Shanel Normandin, Tyler Safran, Ryan Mitchell, Peter Davison, Sebastian Winocour, Edward Reece, Mirko S. S. Gilardino, Liqin Xu, Joshua Vorstenbosch
PLASTIC AND RECONSTRUCTIVE SURGERY
(2023)
Article
Green & Sustainable Science & Technology
Yingbo Zhang, Kui Shan, Xiuming Li, Hangxin Li, Shengwei Wang
Summary: Data centers have attracted worldwide attention due to their high energy consumption, and high-temperature data centers could save significant cooling energy. However, addressing technical bottlenecks and ensuring equipment reliability are essential before implementing high-temperature data centers. This paper provides a comprehensive review of these critical aspects, categorizing and analyzing the benefits, bottlenecks, and potential solutions.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Genetics & Heredity
Hsien-Yu Fan, Wan-Yu Lin, Tzu-Pin Lu, Yun-Yu Chen, Justin BoKai Hsu, Sung-Liang Yu, Ta-Chen Su, Hung-Ju Lin, Yang-Ching Chen, Kuo-Liong Chien
Summary: This study used targeted next-generation sequencing to investigate the association between genetic variants and left ventricular mass, and identified candidate genes including CASQ2, COL5A1, and FXN. These findings provide important insights into the functional mechanisms of these genes and variants.
FRONTIERS IN GENETICS
(2023)
Review
Oncology
Yuchen Zhang, Chongjie Yao, Ziyong Ju, Danli Jiao, Dan Hu, Li Qi, Shimin Liu, Xueqing Wu, Chen Zhao
Summary: Kruppel-like factors (KLFs) are DNA-binding transcriptional regulators that play essential roles in various cellular processes, including tumor development. They regulate multiple signaling pathways and mediate crosstalk among them, and their abnormal expression is closely associated with tumor cell characteristics and alterations in the tumor microenvironment. The role of each KLF in tumors varies depending on tumor type and stage of development. This review focuses on the molecular biology of KLFs, the regulation of classical signaling pathways by these factors, and their potential as molecular targets in tumor therapy.
FRONTIERS IN ONCOLOGY
(2023)
