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Structurally Flexible 2D Spacer for Suppressing the Electron-Phonon Coupling Induced Non-Radiative Decay in Perovskite Solar Cells

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Nano-Micro Letters 2024年第9期16卷 325-340页

作者： Ruikun Cao Kexuan Sun Chang Liu Yuhong Mao Wei Guo Ping Ouyang Yuanyuan Meng Ruijia Tian Lisha Xie Xujie Lü Ziyi Ge Zhejiang Provincial Engineering research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201People’s Republic of China School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China Center for High Pressure Science and Technology Advanced research(HPSTAR) Shanghai 201203People’s Republic of China

This study presents experimental evidence of the dependence of non-radiative recombination processes on the electron-phonon coupling of perovskite in perovskite solar cells(PSCs).Via A-site cation engineering,a weaker electron-phonon coupling in perovskite has been achieved by introducing the structurally soft cyclohexane methylamine(CMA^(+))cation,which could serve as a damper to alleviate the mechanical stress caused by lattice oscillations,compared to the rigid phenethyl methylamine(PEA^(+))*** demonstrates a significantly lower non-radiative recombination rate,even though the two types of bulky cations have similar chemical passivation effects on perovskite,which might be explained by the suppressed carrier capture process and improved lattice geometry *** resulting PSCs achieve an exceptional power conversion efficiency(PCE)of 25.5%with a record-high opencircuit voltage(V_(OC))of 1.20 V for narrow bandgap perovskite(FAPbI_(3)).The established correlations between electron-phonon coupling and non-radiative decay provide design and screening criteria for more effective passivators for highly efficient PSCs approaching the Shockley-Queisser limit.

关键词： Electron-phonon coupling A-site cation engineering Non-radiative recombination

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Polygon search algorithm for ultra-compact multifunctional integrated photonics design

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Photonics research 2024年第7期12卷 1527-1541页

作者： TE DU ZHENG PENG PEIXIN HUANG ZHAOJIAN ZHANG HANSI MA XINPENG JIANG JIE HUANG MINGYU LUO HONGXIN ZOU JUNBO YANG Center of Material Science College of ScienceNational University of Defense TechnologyChangsha 410073China institute for Quantum Science and Technology College of ScienceNational University of Defense TechnologyChangsha 410073China College of Computer National University of Defense TechnologyChangsha 410073China College of Systems Engineering National University of Defense TechnologyChangsha 410073China Defense Innovation institute Academy of Military SciencesBeijing 100071China Photonics research institute Department of Electrical and Electronic EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Hunan Key Laboratory of Mechanism and Technology of Quantum Information Changsha 410073China

Ultra-compact multifunctional integrated photonic modules have great practical significance to photonic integrated circuits (PICs).However,the design effect and efficiency of the existing mainstream inverse design algorithms are incompetent when designing these *** analyze their shortcomings in this task,and propose a new,to our knowledge,inverse design algorithm named polygon search (PS) algorithm to address these *** utilize the PS algorithm to design an integrated dual-channel mode-conversion-crossing waveguide *** module integrates three functions:interconversion between TE_(0) and TE_(1),interconversion between TE_(0) and TE_(2),and channel crossing within only a 4μm×4μm footprint,and its performance is verified by experimental *** not only greatly reduces the total footprint of many PICs but also greatly improves their fabricating ***,we propose a PS-designed mode mixer and a PS-designed bending waveguide,and connect them with the integrated modules to form a four-channel crossing-mode-division-multiplexing *** system can provide multiple modes on the basis of channel crossing and transmit the output signal in the same direction in parallel within a single output waveguide,which significantly increases the communication bandwidth and decreases the footprint of *** last,we demonstrate the effect and efficiency advantages of the PS algorithm over several mainstream inverse design algorithms by a comprehensive contrast experiment and explain these advantages in theory from several perspectives.

关键词： waveguide mixer algorithm

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Study on design pressure of in-service welding pipes

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Science China(Technological Sciences) 2006年第4期49卷 434-444页

作者： XUE Xiaolong1, ZHU Jiagui2 & SANG Zhifu1 1. College of mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China 2. Nanjing Yangzi Petrochemical Maintenance and Installation Co. Ltd., Nanjing 210048, China 1. College of mechanical and Power Engineering Nanjing University of Technology Nanjing 210009 China 2. Nanjing Yangzi Petrochemical Maintenance and Installation Co. Ltd. Nanjing 210048 China

A method of predicting design pressure and burn-through of in-service welding pipes was established. Temperature distributions of in-service welding under variable parameters were simulated by FEM. The effect of flowing of internal media was regarded as forced convection. Based on the numerical results, design pressure of the pipe can be obtained and burn-through can be predicted. It can be concluded that the design pressure decreases with the increasing of heat input. RSF and design pressure of the pipe increase with the increasing of flow rate. There is a range in which the increase changes greatly. For in-service welding, the range should be considered adequately to determine operating condition optimally. RSF increases with the increasing of pipe wall thickness. While the thickness increases to an extent, RSF shows little increase. Accord- ing to the curves of design pressure versus different parameters, safe working pressure can be achieved.

关键词： in-service welding, heat input, flow rate, pipe wall thickness, design pressure.

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Ultra-Robust and High-Performance Rotational Triboelectric Nanogenerator by Bearing Charge Pumping

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Energy & Environmental Materials 2024年第2期7卷 343-349页

作者： Xianpeng Fu Yuhan Qin Zhi Zhang Guoxu Liu Jie Cao Beibei Fan Zhaozheng Wang Zheng Wang Chi Zhang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Center on Nanoenergy research School of Physical Science and TechnologyGuangxi UniversityNanning 530004China

As an emerging technology to convert environmental high-entropy energy into electrical energy,triboelectric nanogenerator(TENG)has great demands for further enhancing the service lifetime and output performance in practical ***,an ultra-robust and high-performance rotational triboelectric nanogenerator(R-TENG)by bearing charge pumping is *** R-TENG composes of a pumping TENG(P-TENG),an output TENG(O-TENG),a voltage-multiplying circuit(VMC),and a buffer *** P-TENG is designed with freestanding mode based on a rolling ball bearing,which can also act as the rotating mechanical energy *** output low charge from the P-TENG is accumulated and pumped to the non-contact O-TENG,which can simultaneously realize ultralow mechanical wear and high output *** matched instantaneous power of R-TENG is increased by 32 times under 300 r/***,the transferring charge of R-TENG can remain 95%during 15 days(6.4×10^(6)cycles)continuous *** work presents a realizable method to further enhance the durability of TENG,which would facilitate the practical applications of high-performance TENG in harvesting distributed ambient micro mechanical energy.

关键词： bearing charge pumping triboelectric nanogenerators ultralow mechanical wear ultra-robust voltage-multiplying circuit

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34 GHz Bandpass Filter for Low-temperature Co-fired Ceramic System-in-Package Application

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Chinese Journal of mechanical Engineering 2011年第2期24卷 309-315页

作者： XU Ziqiang SHI Yu ZENG Zhiyi LIAO Jiaxuan LI Tian research institute of Electronic Science and Technology University of Electronic Science and Technology of China Chengdu 610054 China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China School of Microelectronics and Solid-State Electronics University of Electronic Science and Technology of China Chengdu 610054 China

Modern electronic circuit requires compact,multifunctional technology in communication ***,it is very difficult due to the limitations in passive component miniaturization and the complication of fabrication *** bandpass filter is one of the most important passive components in millimeter（mm）-wave communication system,attracting significant interest in three-dimension（3D） miniaturized design,which is few *** this paper,a bandpass filter structure using low-temperature co-fired ceramic（LTCC） technology,which is fully integrated in a system-in package（SIP） communication module,is presented for miniaturized and high reliable mm-wave *** bandpass filter with 3D end-coupled microstrip resonators is implemented in order to achieve a high performance bandwidth ***,all of the resonators are embedded into different ceramic layers to decrease the insertion loss and enhance the out-of-band rejection performance by optimizing the coupling coefficient and the coupling strength.A fence structure,which is formed by metal-filled via array with the gap less than quarter wavelength,is placed around the embedded bandpass filter to avoid electromagnetic（EM） interference problem in multilayer *** structural model is validated through actual LTCC *** bandpass filter is successfully manufactured by modifying the co-fireablity characteristics,adjusting the sintering profile,releasing the interfacial stress,and reducing the shrinkage mismatch with different *** results show good performance and agree well with the high frequency EM full wave *** influence of layer thickness and dielectric constant on the frequency response in fabricated process is analyzed,where thicker ceramic sheets let the filter response shift to higher ***,measured S-parameters denote the center frequency is also strongly influenced by the variation of ceramic material＇s dielectric *** an

关键词： three-dimensional(3D) structure bandpass filter low-temperature co-fired ceramic(LTCC) system in package(SIP)

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Conductive phthalocyanine-based metal-organic framework as a highly efficient electrocatalyst for carbon dioxide reduction reaction

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Science China Chemistry 2021年第8期64卷 1332-1339页

作者： Meng-Di Zhang Duan-Hui Si Jun-Dong Yi Qi Yin Yuan-Biao Huang Rong Cao State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou350002China University of Chinese Academy of Sciences Beijing100049China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou350007China Fujian College University of Chinese Academy of SciencesFuzhou350002China

Porous crystalline metal-organic frameworks(MOFs)are one class of promising electrode materials for CO_(2)electroreduction reaction(CO_(2)RR)by virtue of their large CO_(2)adsorption capacities and abundant tunable active sites,but their insulating nature usually leads to low current ***,a two-dimensional(2D)Ni-phthalocyanine-based MOF(NiPc-Ni(NH)4)constructed by 2,3,9,10,16,17,23,24-octaaminophthalocyaninato nickel(II)(NiPc-(NH_(2))_(8))and nickel(II)ions attained high electrical conductivity due to the high overlap of d-πconjugation orbitals between the nickel node and the Ni-phthalocyanine-substituted *** CO_(2)RR,the NiPc-Ni(NH)4 nanosheets achieved a high CO Faradaic efficiency of 96.4%at−0.7 V and a large CO partial current density of 24.8 mA cm^(−2)at−1.1 V,which surpassed all the reported two-dimensional MOF electrocatalysts evaluated in an *** control experiments and density functional theory(DFT)calculations suggested that the Ni-N_(4)units of the phthalocyanine ring are the catalytic active *** work provides a new route to the design of highly efficient porous framework materials for the enhanced electrocatalysis via improving electrical conductivity.

关键词： metal-organic frameworks electroreduction conductive CO_(2) CO

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Fabrication of SA/Gel/C scaffold with 3D bioprinting to generate micro-nano porosity structure for skin wound healing: a detailed animal in vivo study

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Cell Regeneration 2022年第1期11卷 97-108页

作者： Changmei Niu Liyang Wang Dongdong Ji Mingjun Ren Dongxu Ke Qiang Fu Kaile Zhang Xi Yang Novaprint Therapeutics Suzhou Co. LtdSuzhou 215000China Shanghai University of Engineering Science Shanghai 201620China Department of Burns and Plastic Surgery Affiliated Suzhou Hospital Of Nanjing Medical University Suzhou 215000China State Key Laboratory of mechanical System and Vibration School of Mechanical EngineeringShanghai Jiaotong UniversityShanghai 200240China The Department of Urology Affiliated Sixth People’s HospitalShanghai JiaoTong UniversityShanghai 200235China Shanghai Eastern institute of Urologic Reconstruction Shanghai 200000China

Bioprinting has exhibited remarkable promises for the fabrication of functional skin ***,there are some significant challenges for the treatment of full-thickness skin defects in clinical *** is necessary to determine bioinks with suitable mechanical properties and desirable ***,the key for printing skin is to design the skin structure optimally,enabling the function of the *** this study,the full-thickness skin scaffolds were prepared with a gradient pore structure constructing the dense layer,epidermis,and dermis by different ratios of *** hypothesized that the dense layer protects the wound surface and maintains a moist environment on the wound *** developing a suitable hydrogel bioink formulation(sodium alginate/gelatin/collagen),to simulate the physiological structure of the skin via 3D printing,the proportion of hydrogels was optimized corresponding to each *** results reveal that the scaffold has interconnected macroscopic channels,and sodium alginate/gelatin/collagen scaffolds accelerated wound healing,reduced skin wound contraction,and re-epithelialization in *** is expected to provide a rapid and economical production method of skin scaffolds for future clinical applications.

关键词： 3D bioprinting Skin tissue engineering Skin scaffold Hydrogel

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Optically read Coriolis vibratory gyroscope based on a silicon tuning fork

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Microsystems & Nanoengineering 2019年第1期5卷 174-184页

作者： N.V.Lavrik P.G.Datskos Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTN 37931-6054USA mechanical and Thermal Engineering Sciences National Renewable Energy LaboratoryGoldenCO 80401USA

In this work,we describe the design,fabrication,and characterization of purely mechanical miniature resonating structures that exhibit gyroscopic performance comparable to that of more complex microelectromechanical *** to previous implementations of Coriolis vibratory gyroscopes,the present approach has the key advantage of using excitation and probing that do not require any on-chip electronics or electrical contacts near the resonating *** specifically,our design relies on differential optical readout,each channel of which is similar to the“optical lever”readout used in atomic force *** piezoelectrically actuated stage provides highly efficient excitation of millimeter-scale tuning fork structures that were fabricated using widely available high-throughput waferlevel silicon *** our experiments,reproducible responses to rotational rates as low as 1.8×10^(3)°h^(−1)were demonstrated using a benchtop prototype without any additional processing of the raw *** noise-equivalent rate,Ω_(NER),derived from the Allan deviation plot,was found to bemechanical *** fact,the performance demonstrated in this proof-of-principle study is approximately four orders of magnitude away from the fundamental limit.

关键词： structure excitation proof

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Femtosecond laser irradiation induced heterojunctions between carbon nanofibers and silver nanowires for a flexible strain sensor

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Journal of Materials Science & Technology 2021年第25期84卷 139-146页

作者： Jiayun Feng Yanhong Tian Sumei Wang Ming Xiao Zhuang Hui Chunjin Hang Walter W.Duley Y.Norman Zhou State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China Centre for Advanced Materials Joining University of WaterlooWaterlooOntarioN2L 3G1Canada Laser Micro/Nano-Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing100081China Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing100083China Department of Physics and Astronomy University of WaterlooWaterlooOntarioN2L 3G1Canada

We report the direct joining of carbon nanofibers(CNFs)to silver nanowire(Ag NWs)by controlled irradiation with femtosecond(fs)laser *** separate types of nano-junction dependent on joint geometry,laser fluence and irradiation time are identified in irradiated *** one type of junction,the tip of an Ag NW is melted and flows to form a bond with an adjacent *** second type of junction occurs without significant heating of the Ag NW and involves the softening and flow of carbon in the CNF in response to the transfer of plasmonic energy from the Ag NW into the *** in a T-type joint configuration can be of either kind depending on the relative orientation of the incident optical field and the long axis of the Ag *** simulations were used to explore this effect for different joint geometries and laser *** electrical properties of a heterojunction involving a single Ag NW-CNF structure have been measured,and it is found that the junction resistance can be reduced by six orders of magnitude after laser ***,we have investigated the properties of a strain sensor based on an Ag NW-CNF hybrid nanowire network and find that this device can exhibit high *** sensitivity occurs as nano-junctions induced by fs laser irradiation greatly reduces the initial *** laser-based technique for direct nanojoining of CNF and Ag NWs may enable the design of robust nanowire structures for application in a variety of new devices.

关键词： Nanojoining Carbon nanofiber Silver nanowire Femtosecond laser Strain sensor

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Massively parallel universal linear transformations using a wavelength-multiplexed diffractive optical network

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Advanced Photonics 2023年第1期5卷 27-49页

作者： Jingxi Li Tianyi Gan Bijie Bai Yi Luo Mona Jarrahi Aydogan Ozcan University of California Electrical and Computer Engineering DepartmentLos AngelesCaliforniaUnited States University of California Bioengineering DepartmentLos AngelesCaliforniaUnited States University of California California NanoSystems InstituteLos AngelesCaliforniaUnited States

Large-scale linear operations are the cornerstone for performing complex computational *** optical computing to perform linear transformations offers potential advantages in terms of speed,parallelism,and ***,the design of successive spatially engineered diffractive surfaces forming an optical network was demonstrated to perform statistical inference and compute an arbitrary complex-valued linear transformation using narrowband *** report deep-learning-based design of a massively parallel broadband diffractive neural network for all-optically performing a large group of arbitrarily selected,complex-valued linear transformations between an input and output field of view,each with Ni and No pixels,*** broadband diffractive processor is composed of Nw wavelength channels,each of which is uniquely assigned to a distinct target transformation;a large set of arbitrarily selected linear transformations can be individually performed through the same diffractive network at different illumination wavelengths,either simultaneously or sequentially(wavelength scanning).We demonstrate that such a broadband diffractive network,regardless of its material dispersion,can successfully approximate Nw unique complex-valued linear transforms with a negligible error when the number of diffractive neurons(N)in its design is≥*** further report that the spectral multiplexing capability can be increased by increasing N;our numerical analyses confirm these conclusions for Nw>180 and indicate that it can further increase to Nw∼2000,depending on the upper bound of the approximation *** parallel,wavelength-multiplexed diffractive networks will be useful for designing highthroughput intelligent machine-vision systems and hyperspectral processors that can perform statistical inference and analyze objects/scenes with unique spectral properties.

关键词： optical neural network deep learning diffractive optical network wavelength multiplexing optical computing

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