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Evolution of molecular structure of TATB under shock loading from transient Raman spectroscopic technique

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Defence Technology（防务技术） 2024年第3期33卷 613-620页

作者： Hongliang Kang Xue Yang Wenshuo Yuan lei Yang Xinghan li Fusheng liu Zhengtang liu Qijun liu Bond and band Engineering Group School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031China State Key laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China

By combination of the transient Raman spectroscopic measurement and the density functional theoretical calculations,the structural evolution and stability of TATB under shock compression was *** to the improvement in synchronization control between two-stage light gas gun and the transient Raman spectra acquisition,as well as the sample preparation,the Raman peak of the N-O mode of TATB was firstly observed under shock pressure up to 13.6 GPa,noticeably higher than the upper limit of 8.5 GPa reported in available *** taking into account of the continuous shift of the main peak and other observed Raman peaks,we did not distinguish any structural transition or any new ***,both the present Raman spectra and the time-resolved radiation of TATB during shock loading showed that TATB exhibits higher chemical stability than previous *** reveal the detailed structural response and evolution of TATB under compression,the density functional theoretical calculations were conducted,and it was found that the pressure make N-O bond lengths shorter,nitro bond angles larger,and intermolecular and intra-molecular hydrogen bond interactions *** observed red shift of Raman peak was ascribed to the abnormal enhancement of H-bound effect on the scissor vibration mode of the nitro group.

关键词： TATB Raman spectra Structural evolution Shock loading

Current collapse suppressed GaN diodes with 38 Watts high RF power rectifier capability

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Science China(Information Sciences) 2024年第2期67卷 335-336页

作者： Kui DANG Zhilin QIU Shudong HUO Peng ZHAN Huining lIU Yachao ZHANG Jing NING Hong ZHOU Jincheng ZHANG Key lab of Ministry of Education for Wide band-Gap Semiconductor Materials and Devices School of MicroelectronicsXidian University Guangzhou Wide bandgap Semiconductor Innovation Center Guangzhou Institute of TechnologyXidian University

Microwave power transmission(MPT) could realize the point-to-point long-distance transfer of energy without any wires, which makes it attractive for solar-powered satellites,drones, and implantable medical devices, and has aroused enormous attention [1]. Microwave rectifiers could convert RF(radio frequency) energy into DC(direct current) power,

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Machine learning-assisted smart epitaxy of Ⅲ-V semiconductors

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Science China Materials 2024年

作者： Yue Hao Key laboratory of Wide band Gap Semiconductor Technology School of Microelectronics Xidian University

Semiconductor epitaxial growth is the front-end process for manufacturing microelectronic and optoelectronic *** beam epitaxy（MBE）, capable of precisely controlling atomic layer deposition, has emerged as a crucial technique in chip atomic-level manufacturing[1]. However, in semiconductor epitaxy, the heterogeneous nature of materials is complicated, and the growth condition fluctuations poses significant challenges in defect suppression[2], substantially impacting chip performance and yield.

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Dual-Schottky-junctions coupling device based on ultra-longβ-Ga_(2)O_(3)single-crystal nanobelt and its photoelectric properties

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Journal of Semiconductors 2024年第5期45卷 90-98页

作者： Haifeng Chen Xiaocong Han Chenlu Wu Zhanhang liu Shaoqing Wang Xiangtai liu Qin lu Yifan Jia Zhan Wang Yunhe Guan lijun li Yue Hao Key laboratory of Advanced Semiconductor Devices and Materials School of Electronic EngineeringXi’an University of Posts andT elecommunicationsXi’an 710121China State Key Discipline laboratory of Wide band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'an 710071China

High qualityβ-Ga_(2)O_(3)single crystal nanobelts with length of 2−3 mm and width from tens of microns to 132μm were synthesized by carbothermal reduction *** on the grown nanobelt with the length of 600μm,the dual-Schottky-junctions coupling device(DSCD)was *** to the electrically floating Ga_(2)O_(3)nanobelt region coupling with the double Schottky-junctions,the current I_(S2)increases firstly and rapidly reaches into saturation as increase the voltage V_(S2).The saturation current is about 10 pA,which is two orders of magnitude lower than that of a single *** the case of solar-blind ultraviolet(UV)light irradiation,the photogenerated electrons further aggravate the coupling physical mechanism in device.I_(S2)increases as the intensity of UV light *** the UV light of 1820μW/cm^(2),I_(S2)quickly enters the saturation *** V_(S2)=10 V,photo-to-dark current ratio(PDCR)of the device reaches more than 104,the external quantum efficiency(EQE)is 1.6×10^(3)%,and the detectivity(D*)is 7.5×10^(12)*** addition,the device has a very short rise and decay times of 25−54 ms under different positive and negative *** shows unique electrical and optical control characteristics,which will open a new way for the application of nanobelt-based devices.

关键词： β-Ga_(2)O_(3)nanobelt carbothermal reduction UV light dual-Schottky coupling device

Graded Heterojunction Improves Wide-bandgap Perovskite for Highly Efficient 4-Terminal Perovskite/Silicon Tandem Solar Cells

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Research 2024年第2期2023卷 181-190页

作者： Wenming Chai lindong li Weidong Zhu Dazheng Chen long Zhou He Xi Jincheng Zhang Chunfu Zhang Yue Hao State Key Discipline laboratory of Wide band Gap Semiconductor Technology&Shaanxi Joint Key laboratory of Graphene School of MicroelectronicsXidian UniversityXi'anShaanxi 710071China Xi'an Baoxin Solar Technology Co. Ltd.Xi'an710071China

Wide-bandgap(WBG)perovskite solar cells(PSCs)are essential for highly efficient and stable silicon/perovskite tandem solar *** this study,we adopted a synthetic strategy with lead thiocyanate(Pb(SCN)_(2))additive and methylammonium chloride(MACl)posttreatment to enhance the crystallinity and improve the interface of WBG perovskite films with a bandgap of 1.68 *** excessive PbI_(2)was formed at grain boundaries and converted into MAPbI_(3-x)Cl_(x)perovskites,which are utilized to form the graded heterojunction(GHJ)and compressive *** is beneficial for passivating nonradiative recombination defects,suppressing halide phase segregation,and facilitating carrier ***,the device with GHJ delivered a champion efficiency of 20.30%and superior stability in ambient air and under 85℃.Finally,we achieved a recorded efficiency of 30.91%for 4-terminal WBG perovskite/TOPCon tandem silicon solar *** findings demonstrate a promising approach for fabricating efficient and stable WBG PSCs through the formation of GHJ.

关键词： perovskite Graded Highly

Broadband light-active optoelectronic FeFET memory for in-sensor non-volatile logic

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Science China(Information Sciences) 2024年第9期67卷 346-347页

作者： Yong ZHANG Dongxin TAN Cizhe FANG Zheng-Dong lUO Qiyu YANG Qiao ZHANG Yu ZHANG Xuetao GAN Yan lIU Yue HAO Genquan HAN State Key Discipline laboratory of Wide band Gap Semiconductor Technology School of MicroelectronicsXidian University Hangzhou Institute of Technology Xidian University Key laboratory of light Field Manipulation and Information Acquisition Ministry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information Technology School of Physical Science and TechnologyNorthwestern Polytechnical University

Machine vision has become crucial in the modern intelligence era, especially in rapidly developing applications such as autonomous vehicles and robotic visual sensors [1].With the ever-increasing requirements of visua... 详细信息

关键词： Ferroelectric RAM

Shock Raman spectra and structural transformation of powdered TKX-50 by the plate impact experiments combined with real-time Raman detection

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Defence Technology（防务技术） 2024年第1期31卷 158-162页

作者： Xue Yang Qijun liu Yundan Gan lei Yang Zhengtang liu Fusheng liu Bond and band Engineering Group School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China Xi'an Modern Chemistry Research Institute Xi'an 710065People's Republic of China State Key laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072People's Republic of China

As an energetic material of great interest,the work capacity of dihydroxylammonium 5,5’-bistetrazole-1,1’-diolate(TKX-50)has been questioned *** some research groups have explored the reasons for the low working ability of TKX-50,the plane impact experiment on powdered TKX-50 is obviously closer to the practical application,and the conclusions based on this are more ***,we performed shock Hugoniot measurements of powdered TKX-50 between 5.65 and 16.29 *** plane impact experiments of powdered TKX-50 were carried out and the shocked Raman spectra were *** Raman spectroscopy analysis,a new peak of powdered TKX-50 was found between19.47 GPa and 24.96 GPa,which may be caused by decomposition/phase transition and was related with the low work capacity.

关键词： Powdered TKX-50 Hugoniot Raman Decomposition Phase transition

Accelerated Sequential Deposition Reaction via Crystal Orientation Engineering for low-Temperature,High-Efficiency Carbon-Electrode CsPbBr_(3) Solar Cells

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Energy & Environmental Materials 2024年第1期7卷 168-175页

作者： Zeyang Zhang Weidong Zhu Tianjiao Han Tianran Wang Wenming Chai Jiaduo Zhu He Xi Dazheng Chen Gang lu Peng Dong Jincheng Zhang Chunfu Zhang Yue Hao State Key Discipline laboratory of Wide band Gap Semiconductor Technology&Shaanxi Joint Key laboratory of Graphene School of MicroelectronicsXidian UniversityXi'an 710071China Guangzhou Wide bandgap Semiconductor Innovation Center Guangzhou institute of technologyXidian UniversityGuangzhou 510555China Qinghai Huanghe Hydropower Development CO. LTD.Xining810008China

low-temperature,ambient processing of high-quality CsPbBr_(3)films is demanded for scalable production of efficient,low-cost carbon-electrode perovskite solar cells(PSCs).Herein,we demonstrate a crystal orientation engineering strategy of PbBr_(2)precursor film to accelerate its reaction with CsBr precursor during two-step sequential deposition of CsPbBr_(3)*** a novel strategy is proceeded by adding CsBr species into PbBr_(2)precursor,which can tailor the preferred crystal orientation of PbBr_(2)film from[020]into[031],with CsBr additive staying in the film as CsPb_(2)Br_(5)*** calculations show that the reaction energy barrier of(031)planes of PbBr_(2)with CsBr is lower about 2.28 eV than that of(O2O)***,CsPbBr_(3)films with full coverage,high purity,high crystallinity,micro-sized grains can be obtained at a low temperature of 150℃.Carbon-electrode PSCs with these desired CsPbBr_(3)films yield the record-high efficiency of 10.27%coupled with excellent operation ***,the 1 cm^(2)area one with the superior efficiency of 8.00%as well as the flexible one with the champion efficiency of 8.27%and excellent mechanical bending characteristics are also achieved.

关键词： carbon-electrode perovskite solar cells crystal orientation engineering CsPbBr_(3) low temperature two-step sequential deposition

Effects of magnet shapes on total harmonic distortion and cogging torque in a permanent magnet synchronous generator for wind turbines

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Clean Energy 2023年第5期7卷 1058-1068页

作者： Erol Kurt Adem Dalcalı Gazi university Department of Electrical and Electronics EngineeringTechnology FacultyAnkaraTurkey bandırma onyedi eylul university Department of Electrical and Electronics EngineeringFaculty of Engineering and Natural SciencesBandırmaBalıkesirTurkey National Research university TIIAME100000TashkentUzbekistan

This paper explores and theoretically reports the effects of different magnet structures on the cogging torque and the total harmonic distortion of the output waveforms from a permanent magnet *** generator is a radial flux machine and four different structures are considered for the magnet arrangement in the rotor component and modelled in the Ansys/Maxwell electromagnetic simulation *** three-phase machine exhibits different behaviours towards various magnet structures,***,inclined slotted rectangular,skewed double rectangular and inclined slotted skewed double rectangular,*** has been proven by finite element analysis and Fourier analysis that both the cogging and total harmonic distortion values vary significantly for all *** cogging torque values change in the range of 89.95 to 436.75 mNm and the lowest cogging torque is measured for the inclined slotted skewed double rectangular magnet geometry,while the conventional rectangular magnet geometry yields the worst value with 436.75 ***,the total harmonic distortion values varies between 1.63 and 3.55 for different magnetic *** the worst total harmonic distortion value is obtained from the inclined slotted rectangular magnet,the best total harmonic distortion is acquired from the skewed double rectangular *** these results will provide scientists and engineers with important information in order to obtain more efficient machines.

关键词： renewable energy wind power finite element method synchronous generator wind turbines