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Flexible UV detectors based on in-situ hydrogen doped amorphous Ga_(2)O_(3) with high photo-to-dark current ratio

Materials Futures 2024年第1期3卷 181-189页

作者： Yanxin Sui Huili Liang wenxing huo Xiaozhi Zhan Tao Zhu Zengxia Mei Songshan Lake Materials Laboratory DongguanGuangdong 523808People’s Republic of China Institute of Physics Chinese Academy of SciencesBeijing 100190People’s Republic of China Department of Biomedical Engineering Tianjin University92 Weijin RoadTianjin 300072People’s Republic of China China Spallation Neutron Source DongguanGuangdong 523803People’s Republic of China

Amorphous Ga_(2)O_(3)(a-Ga_(2)O_(3))has been attracting more and more attention due to its unique merits such as wide bandgap(∼4.9 eV),low growth temperature,large-scale uniformity,low cost and energy efficient,making it a powerful competitor in flexible deep ultraviolet(UV)*** the responsivity of the ever-reported a-Ga_(2)O_(3)UV photodetectors(PDs)is usually in the level of hundreds of A/W,it is often accompanied by a large dark current due to the presence of abundant oxygen vacancy(VO)defects,which severely limits the possibility to detect weak signals and achieve versatile *** this work,the VO defects in a-Ga_(2)O_(3)thin films are successfully passivated by in-situ hydrogen doping during the magnetron sputtering *** a result,the dark current of a-Ga_(2)O_(3)UV PD is remarkably suppressed to 5.17×10^(-11) A at a bias of 5 ***,the photocurrent of the corresponding device is still as high as 1.37×10^(-3)A,leading to a high photo-to-dark current ratio of 2.65×107 and the capability to detect the UV light with the intensity below 10 nW cm^(-2).Moreover,the H-doped a-Ga_(2)O_(3)thin films have also been deposited on polyethylene naphtholate substrates to construct flexible UV PDs,which exhibit no great degradation in bending states and fatigue *** results demonstrate that hydrogen doping can effectively improve the performance of a-Ga_(2)O_(3)UV PDs,further promoting its practical application in various areas.

关键词： Ga_(2)O_(3) hydrogen doping ultraviolet photodetector photo-to-dark current ratio neutron reflection

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Low-Voltage IGZO Field-Effect Ultraviolet Photodiode

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Chinese Physics Letters 2024年第6期41卷 156-161,I0001-I0003页

作者：宋双梁会力霍文星张广张永晖王绩伟梅增霞 Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China College of Physics Liaoning UniversityShenyang 110036China Department of Instruments Science and Technology School of Precision Instrument and Opto-electronics EngineeringTianjin UniversityTianjin 300072China National Key Laboratory of Scattering and Radiation Beijing 100039China School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255000China

In the era of Internet of Things(Io Ts),an energy-efficient ultraviolet(UV)photodetector(PD)is highly desirable considering the massive usage scenarios such as environmental sterilization,fire alarm and corona discharge *** far,common self-powered UV PDs are mainly based on metal-semiconductor heterostructures or p–n heterojunctions,where the limited intrinsic built-in electric field restricts further enhancement of the *** this work,an extremely low-voltage field-effect UV PD is proposed using a gatedrain shorted amorphous IGZO(a-IGZO)thin film transistor(TFT)architecture.A combined investigation of the experimental measurements and technology computer-aided design(TCAD)simulations suggests that the reverse current(ⅠR)of field-effect diode(FED)is highly related with the threshold voltage(Vth)of the parental TFT,implying an enhancement-mode TFT is preferable to fabricate the field-effect UV PD with low dark *** by a low bias of-0.1 V,decent UV response has been realized including large UV/visible(R_(300)/R_(550))rejection ratio(1.9×10^(3)),low dark current(1.15×10^(-12)A)as well as high photo-to-dark current ratio(PDCR,~10^(3))and responsivity(1.89 A/W).This field-effect photodiode provides a new platform to construct UV PDs with well-balanced photoresponse performance at a low bias,which is attractive for designs of large-scale smart sensor networks with high energy efficiency.

关键词： IGZO attractive ultraviolet

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An innovative model for the transient response of a spherical thin-shell transducer and an experimental confirmation

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Science China(Physics,Mechanics & Astronomy) 2018年第11期61卷 107-110页

作者： AiHua Tang ZengXia Mei wenxing huo XiaoLong Du Key Laboratory for Renewable Energy Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

As a prototypical transparent conducting oxide （TCO）, In2O3 after heavily doped with Sn exhibits a priority in optoelectronic applications involving organic light emitting diodes （OLED） and organic photovoltaics （OPVs） [1,2]. Mean-while, In2O3 itself manifests potential use in detection of active gases such as ozone and NO2 [3]. In the last few years, the interest in the electrical conductivity of In2O3 has been rekindled not only because of the developments of their traditional applications in optoelectronics but also due to their possible applications in spintronics and photoelec-trochemistry [4,5].

关键词：氧化物同位素 In2O3 二极管应用优先级 NO2 传导性

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Instant formation of nanopores on flexible polymer membranes using intense pulsed light and nanoparticle templates

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International Journal of Smart and Nano Materials 2023年第4期14卷 391-405页

作者： Miaoning Ren Tianyu Li wenxing huo Yu Guo Zhiqiang Xia Ya Lia Jing Niua M.Serdar Onses Xian Huang Department of Biomedical Engineering Tianjin UniversityTianjinChina ERNAM-Nanotechnology Research and Application Center Department of Materials Science and EngineeringErciyes UniversityKayseriTurkey

The development of simple and high-throughput approaches to yield solid-state nanopores on large surface membranes may facilitate the prevalence of nanopore analysis technology and in-vitro diagnosis using portable ***,solidstate nanopores are typically realized by complex and highend nanofabrication ***,we present a method to achieve nanopores on polymer membranes using,silver nanoparticles(AgNPs)as templates and intense pulsed light(IPL)as a heating *** density and size of nanopores are controllable by adjusting the spin coating rate,the concentration of nanoparticle suspension,and the size of nanoparticles(NPs).The temperature of the AgNPs can rapidly reach 1132 K under instant heating of photothermal effect through light irradiation in 2 ms,resulting in localized melting and decomposition of an underneath polycarbonate(PC)membrane to yield nanopores with sizes ranging from 10 to 270 *** removing the nanoparticle residues,the flexible membrane with nanopores can be integrated into a flow cell to achieve a nanopore sensor that has been used to measure the translocation behaviors of bovine serum albumin(BSA).The results have demonstrated the capability of the sensor in protein denaturation *** low-cost and highthroughput technique to fabricate solid-state nanopores on flexible polymeric membranes may facilitate the development of more nanopore-based flexible sensors that can be integrated with other flexible components for wearable diagnosis.

关键词： Solid-state nanopore intense pulsed light polymer AgNPs flexible membrane

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Effects of active layer thickness on performance and stability of dual-active-layer amorphous InGaZnO thin-film transistors

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Chinese Physics B 2019年第8期28卷 316-323页

作者： wenxing huo Zengxia Mei Yicheng Lu Zuyin Han Rui Zhu Tao Wang Yanxin Sui Huili Liang Xiaolong Du Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Electrical and Computer Engineering Rutgers University94 Brett RdPiscatawayNew Jersey 08854 Songshan Lake Materials Laboratory Dongguan 523808China

Dual-active-layer(DAL)amorphous InGaZnO(IGZO)thin-film transistors(TFTs)are fabricated at low temperature without post-annealing.A bottom low-resistance(low-R)IGZO layer and a top high-resistance(high-R)IGZO layer constitute the DAL homojunction with smooth and high-quality interface by in situ modulation of oxygen *** performance of the DAL TFT is significantly improved when compared to that of a single-active-layer TFT.A detailed investigation was carried out regarding the effects of the thickness of both layers on the electrical properties and gate bias stress *** is found that the low-R layer improves the mobility,ON/OFF ratio,threshold voltage and hysteresis voltage by passivating the defects and providing a smooth *** high-R IGZO layer has a great impact on the hysteresis,which changes from clockwise to *** best TFT shows a mobility of 5.41 cm^2/V·s,a subthreshold swing of 95.0 mV/dec,an ON/OFF ratio of 6.70×10^7,a threshold voltage of 0.24 V,and a hysteresis voltage of 0.13 *** value of threshold voltage shifts under positive gate bias stress decreases when increasing the thickness of both layers.

关键词： thin film transistor InGaZnO dual-active-layer

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柔性边界三轴压缩条件下胶结型水合物沉积物力学特性的离散元模拟

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中南大学学报（自然科学版） 2022年第3期53卷 830-845页

作者：周世琛霍文星周博薛世峰中国石油大学(华东)储运与建筑工程学院山东青岛266580

首先,提出了一种胶结型水合物沉积物离散元试样的生成方法,并采用FLAC3D和PFC3D耦合方法创建了侧面柔性边界条件,生成了不同饱和度的水合物试样;其次,考虑水合物的胶结效应,引入线性平行胶结模型并由室内试验结果标定了接触模型参数;第... 详细信息

首先,提出了一种胶结型水合物沉积物离散元试样的生成方法,并采用FLAC3D和PFC3D耦合方法创建了侧面柔性边界条件,生成了不同饱和度的水合物试样;其次,考虑水合物的胶结效应,引入线性平行胶结模型并由室内试验结果标定了接触模型参数;第三,根据数值模拟结果分析了水合物沉积物的强度和变形破坏特性;最后,从力链和能量角度揭示了水合物在应力传递中的微细观力学机制。研究结果表明:建立的离散元模型能准确计算柔性边界条件下的试样体积变化,其模拟结果与室内试验结果吻合较好;水合物沉积物的黏聚力随着水合物饱和度增加而增大,其内摩擦角与水合物饱和度的关系不大;水合物饱和度对水合物沉积物的应变局部化特征影响很大;水合物颗粒参与力链的形成与演化,水合物饱和度越大,高应力水合物颗粒数目越多,水合物颗粒在力链中占比越大;水合物沉积物的弹性应变能、胶结应变能和摩擦耗能的存储和耗散主要通过砂土与水合物间的接触演化作用完成。

关键词：水合物沉积物离散元法柔性边界强度和变形特性力链能量耗散

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Motion-pressure coupled control and simulation of long-endurance capability for multicapsule stratospheric airships

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Chinese Journal of Aeronautics 2024年第6期37卷 137-150页

作者： Zhiguang SHI Wei huo Zongyu ZUO School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Beijing Near Space Airship Technology Development Co. LtdBeijing 100070China

The current study focuses on the motion-pressure coupled control for a multicapsule stratospheric airship and transforms the path-tracking and heading-hold control of airships into guidance tracking with a time-varying weighted sum of longitudinal and lateral velocities by the definition of compound ***,an improved nonlinear predictive control method is provided to reduce the control energy consumption by the rolling optimization of controller parameters based on finite time intervals,ensuring infinite-time path-tracking ***,combined with the proposed cyclic regulation process of safe pressure between internal and external capsules,this study can fully reflect the force-thermal coupled rule of airships under the actions of atmospheric environment and maneuvering force,while evaluating the long-endurance capability of airships under the conditions of safe superheating and *** effectiveness of the motionpressure coupled controller was verified through numerical simulations,which can overcome the influence of environmental wind and achieve a tracking effect for the desired cruise path and compound *** airspeed provided during the cyclic circadian time caused the maximum superheating of the helium controlled within 30*** helium in the internal and external capsules achieved circadian *** equivalent micropore diameter of the capsule of 5 mm can achieve 55 days of long-endurance *** controller satisfies the requirements of cruise-flight application modes for multicapsule stratospheric airships with important engineering value.

关键词： Compound speed Nonlinear predictive control Cyclic pressure regulation Long-endurance capability Stratospheric airship

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High performance photodegradation resistant PVA@TiO_(2)/carboxyl-PES self-healing reactive ultrafiltration membrane

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Chinese Journal of Chemical Engineering 2024年第2期66卷 31-39页

作者： Yu Liang Yuanfang Fan Zhongmin Su Mingxin huo Xia Yang Hongliang huo Chi Wang Zhi Geng College of Environment Engineering Research Center of Low-Carbon Treatment and Green Development of Polluted Water in Northeast ChinaMinistry of EducationNortheast Normal UniversityChangchun 130117China School of Science Hainan UniversityHaikou 570225China

The occurrence of ultrafiltration(UF)membrane fouling frequently hampers the sustainable advancement of UF *** self-cleaning UF membranes can effectively alleviate the problem of membrane ***,the self-cleaning process may accelerate membrane *** these concerns,we present an innovative design concept for composite self-healing materials based on self-cleaning UF *** begin,TiO_(2)nanoparticles were incorporated into the polymer molecular structure via molecular design,resulting in the synthesis of TiO_(2)/carboxyl-polyether sulfone(PES)hybrid ***,the nonsolvent-induced phase inversion technique was employed to prepare a novel of UF ***,a polyvinyl alcohol(PVA)hydrogel coating was applied to the hybrid UF membrane surface to create PVA@TiO_(2)/carboxyl-PES self-healing reactive UF *** establishing a covalent bond,the TiO_(2)nanoparticles were effectively and uniformly dispersed within the UF membrane,leading to exceptional self-cleaning ***,the water-absorbing and swelling properties of PVA hydrogel,along with its capacity to form hydrogen bonds with water molecules,resulted in UF membranes with improved hydrophilicity and active self-healing *** results demonstrated that the water contact angle of PVA@5%TiO_(2)/carboxyl-PES UF membrane was 43.1°.Following a 1-h exposure to simulated solar exposure,the water flux recovery ratio increased from 48.16%to 81.03%.Moreover,even after undergoing five cycles of 12-h simulated sunlight exposure,the UF membranes exhibited a consistent retention rate of over 97%,thus fully demonstrating their exceptional self-cleaning,antifouling,and selfhealing *** anticipate that the self-healing reactive UF membrane system will serve as a pioneering and comprehensive solution for the self-cleaning antifouling challenges encountered in UF membranes while also effectively mitigating the aging effects of reactive

关键词： Ultrafiltration membrane Self-cleaning Self-healing Poly(aryl ether sulfone)

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设置粘滞阻尼器的钢框架防连续性倒塌分析

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世界地震工程 2012年第4期28卷 111-115页

作者：霍文星袁波王峰姜岚贵州大学空间结构研究中心贵州贵阳550003 内蒙古工业大学内蒙古呼和浩特010051

为了研究设置有粘滞阻尼器的减震钢框架结构的防连续倒塌性能,对设置阻尼器的减震钢框架和未设置阻尼器的原钢框架分别进行了地震弹塑性时程分析,比较了两种情况下的层间位移角。分析结果表明,地震作用下,与原结构相比减震结构的层间位... 详细信息

为了研究设置有粘滞阻尼器的减震钢框架结构的防连续倒塌性能,对设置阻尼器的减震钢框架和未设置阻尼器的原钢框架分别进行了地震弹塑性时程分析,比较了两种情况下的层间位移角。分析结果表明,地震作用下,与原结构相比减震结构的层间位移角最大降低了64.3%。接着采用瞬时加载法对底层各柱失效时的减震钢框架和不设置阻尼器的原钢框架分别进行了动力倒塌分析,比较了减震结构和原结构防连续倒塌的能力,分析结果表明,底层柱失效时,减震结构各柱端点处位移均比原结构降低,最大处降低了63.5%。因此减震结构的阻尼器对结构防连续倒塌能起到较大的作用。

关键词：多层平面钢框架连续倒塌非线性粘滞阻尼器附加阻尼比

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Robust Interval State Estimation for Distribution Systems Considering Pseudo-measurement Interval Prediction

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 179-188页

作者： Xu Zhang Wei Yan Meiqing huo Hui Li the School of Electrical Engineering Chongqing UniversityChongqing 400044China

Interval state estimation(ISE)can estimate state intervals of power systems according to confidence intervals of predicted pseudo-measurements,thereby analyzing the impact of uncertain pseudo-measurements on ***,predicted pseudo-measurements have prediction errors,and their confidence intervals do not necessarily contain the truth values,leading to estimation biases of the *** solve this problem,this paper proposes a pseudo-measurement interval prediction framework based on the Gaussian process regression(GPR)model,thereby improving the prediction accuracy of pseudo-measurement confidence ***,a weight assignment strategy for improving the robustness of weighted least squares(WLS)ISE is *** strategy quantifies the deviation between the pseudo-measurement intervals and their estimated intervals and assigns smaller weights to the pseudo-measurement intervals with larger deviations,thereby improving the estimation accuracy and robustness of the *** paper adopts the data from the supervisory control and data acquisition(SCADA)system of the New York Independent System Operator(NYISO).It verifies the advantages of the GPR method for pseudo-measurement interval prediction by comparing it with the quantile regression and neural network *** addition,this paper demonstrates the effectiveness of the proposed weight assignment strategy through the IEEE 14-bus ***,the differences in the estimation accuracy and the bad data identification between the robust interval state estimation and deterministic state estimation are discussed.

关键词： Interval state estimation interval analysis pseudo-measurement Gaussian process regression(GPR)

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