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Neglected acidity pitfall: boric acid-anchoring hole-selective contact for perovskite solar cells

National science Review 2023年第5期10卷 221-231页

作者： Huanxin Guo Cong Liu Honglong Hu Shuo Zhang Xiaoyu Ji Xiao-Ming Cao Zhijun Ning Wei-Hong Zhu He Tian Yongzhen Wu Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterInstitute of Fine ChemicalsFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and Technology School of Physical Science and Technology Shanghai Tech University

The spontaneous formation of self-assembly monolayer（SAM） on various substrates represents an effective strategy for interfacial engineering of optoele ctronic ***-selective SAM is becoming popular among high-performance inverted perovskite solar cells（PSCs）,but the presence of strong acidic anchors（such as-PO3H2） in state-of-the-art SAM is detrimental to device ***,we report for the first time that acidity-weakened boric acid can function as an alternative anchor to construct efficient SAM-based hole-sele ctive contact（HSC） for *** calculations reve al that boric acid spontaneously chemisorbs onto indium tin oxide（ITO） surface with oxygen vacancies facilitating the adsorption *** and electrical measurements indicate that boric acid anchor significantly mitigates ITO *** excess boric acid containing molecules improves perovskite deposition and results in a coherent and well-passivated bottom interface,which boosts the fill factor（FF） performance for a variety of perovskite *** optimal boric acid-anchoring HSC（MTPA-BA） can achieve power conversion efficiency close to 23% with a high FF of 85.2%.More importantly,the devices show improved stability:90% of their initial efficiency is retained after 2400 h of storage（ISOS-D-1） or 400 h of operation（ISOS-L-1）,which are 5-fold higher than those of phosphonic acid SAM-based ***-weakened boric acid SAMs,which are friendly to ITO,exhibits well the great potential to improve the stability of the interface as well as the device.

关键词： perovskite solar cells hole-selective contact boric acid anchor acid-induced degradation long-term stability

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Multi-functional Fresnel zone aperture camera via fast passive depth estimation 4

Multi-functional Fresnel zone aperture camera via fast passi...

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4th International Computational Imaging Conference, CITA 2024

作者： Yang, Chen Ni, Cong Li, Yusen Zhai, Yusheng He, Weiji Zhang, Wenwen Chen, Qian Advanced Interdisciplinary Research Center for Optics Nanjing University of Science and Technology Jiangsu Province Nanjing210094 China

ISBN: (纸本)9781510688834

The lensless camera with incoherent illumination has gained significant attention due to its liberation from the constraints of traditional camera architectures. It offers unique flexibility and versatility, enhancing the capabilities of imaging technology. Combined with specialized mask structures, the lensless camera is enable to uniquely decode the light field information. Specifically, the captured images inherently encode the three-dimensional spatial information of the scene. This ability is enabled by its depth-dependent point spread function (PSF), which captures both the intensity and depth information of the scene. Therefore, it is possible to obtain the depth of the target from a single shot image. In this paper, we introduce a multi-functional Fresnel zone aperture (FZA) camera operating within the visible spectrum, which leverages passive depth estimation techniques. Equipped with a standardized binary mask structure, the FZA camera simplifies PSF computation and eliminates the need for calibration at varying depths. This not only simplifies the calibration procedure, but also enhances the camera's efficiency and accuracy. Due to the unknown target depth, the quality of image reconstruction relies on the PSF. We perform multiple reconstructions and use the nuclear norm of the gradient (NoG) metric to evaluate the sharpness. The depth corresponding to the sharpest reconstruction is the estimated target depth. In addition, the improved ternary search method is utilized to accelerate the sharpness evaluation process, achieving higher computational efficiency compared to traditional traversal search methods. Using the results from depth estimation, the FZA camera performs multi-functions such as target refocusing, dimension measurement, and motion velocity estimation. The multi-target depth estimation can be achieved in high precision, and enables refocusing across an extensive depth of field (DoF), thereby enhancing the clarity and detail of captured image

关键词： Optical transfer function

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Microwave absorption performance of porous carbon particles modified by nickel with different morphologies

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Journal of Materials science & technology 2023年第6期137卷 79-90页

作者： Zhangtao Shen Yapei Zu Yuqiu Chen Jun Gong Chao Sun School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

In this work,porous carbon particles were prepared from wheat flour by pyrolysis and *** the subsequent coprecipitation and electroless plating,the surface and pores of carbon particles were modified by nickel-rich particles with different *** loss mechanisms,including dielectric loss,magnetic loss,multiple reflection and scattering loss,were used to assess the attenuation ability to incident electromagnetic waves of these composite *** result shows that the chain-shaped morphology of nickel can provide the highest dielectric *** the filler loading of 20 wt.%,the minimum reflection loss(RL min)reached-38.42 dB at 13.2 GHz,and the_(max)imum effective absorption bandwidth(EAB_(max))was 5.2 GHz with a matching thickness of 2 *** excellent performance of the composite particles is attributed to the synergistic effect of outstanding impedance matching and supe-rior electromagnetic loss ability caused by the chain *** result shows that the morphology of modifiers in carbon-based composites is important to improve microwave absorption performance,and this work provides inspiration for the design of high-performance porous carbon-based composites.

关键词： Porous carbon particles Nickel morphology Chain-shaped Microwave absorption performance

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Multiscale Failure Mechanism Analysis of SiC Fiber‑Reinforced TC17 Composite Subjected to Transverse Tensile Loading at Elevated Temperature

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Acta Metallurgica Sinica(English Letters) 2023年第6期36卷 1007-1022页

作者： Qiu‑Yue Jia Yu‑Min Wang Xu Zhang Guo‑Xing Zhang Qing Yang Li‑Na Yang Xu Kong Xiao‑Fang Li Rui Yang Shi‑Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

This study presents a multiscale method to evaluate the transverse tensile strength and failure mechanism of SiC_(f)/TC17 cruciform specimen machined from a large-size *** mechanical properties and failure of the specimen were evaluated through a macroscale model under transverse tensile loading at 200°C.A mesoscale model was developed to analyze the transverse tensile behavior and failure of the composite *** debonding,plastic deformation of matrix and cladding,and damage to the composite core were incorporated into the mesoscopic and macroscopic *** stress–strain curves and fracture modes obtained from the numerical simulation showed good agreement with the experimental curves,acoustic emission test results,and fracture *** simulation results suggested that the damage to the central region interface and the plastic deformation of the matrix initiated first and propagated ***,the interfacial failure,matrix failure,and formation of macro-crack developed,which led to the crack of the titanium matrix composite ***,cladding was plastically deformed and crack developed,which led to the severe failure of the cruciform specimen.

关键词： Continuous fiber-reinforced titanium matrix composite Transverse tensile behavior Multiscale analysis Failure mechanism

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Anisotropy of the Wear Behavior for Carbon Nanotube-Reinforced 6061Al Composites

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Acta Metallurgica Sinica(English Letters) 2023年第5期36卷 814-826页

作者： X.N.Li J.F.Zhang W.H.Xue K.Ma P.Y.Li Z.Y.Liu B.L.Xiao D.R.Ni Q.Z.Wang D.Wang Z.Y.Ma School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

Carbon nanotube(CNT)-reinforced 6061Al(CNT/6061Al)composites with directionally aligned CNT were fabricated,and their wear behavior was *** results indicate that the wear properties of CNT/6061Al composites exhibited a significant anisotropy.A certain CNT concentrations(1 wt%and 2 wt%)could effectively improve the wear resistance of CNT/6061Al composites along the CNT circumferential and CNT radial directions for the load transfer,grain refinement and self-lubrication effect of *** Brass{011}<211>and{112}<110>textures inhibited the load transfer effect of CNT along the CNT radial direction,resulting in a better wear resistance along CNT circumferential direction than CNT radial *** the CNT axial direction,the weak deformability of composites caused by the intensifying<111>fiber texture was the main reasons for the poor wear resistance of CNT/6061Al composites with increasing CNT concentration.

关键词： Carbon nanotube Metal matrix composite Wear Anisotropy

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Cluster-preserving sampling algorithm for large-scale graphs

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science China(Information sciences) 2023年第1期66卷 60-76页

作者： Jianpeng ZHANG Hongchang CHEN Dingjiu YU Yulong PEI Yingjun DENG National Digital Switching System E&T Research Center Information Engineering University Network Systems Department of the Strategic Support Force School of Computer Science and Technology Eindhoven University of Technology Center for Applied Mathematics Tianjin University

Graph sampling is a very effective method to deal with scalability issues when analyzing largescale graphs. Lots of sampling algorithms have been proposed, and sampling qualities have been quantified using explicit properties(e.g., degree distribution) of the sample. However, the existing sampling techniques are inadequate for the current sampling task: sampling the clustering structure, which is a crucial property of the current networks. In this paper, using different expansion strategies, two novel top-leader sampling methods(i.e., TLS-e and TLS-i) are proposed to obtain representative samples, and they are capable of effectively preserving the clustering structure. The rationale behind them is to select top-leader nodes of most clusters into the sample and then heuristically incorporate peripheral nodes into the sample using specific expansion strategies. Extensive experiments are conducted to investigate how well sampling techniques preserve the clustering structure of graphs. Our empirical results show that the proposed sampling algorithms can preserve the population's clustering structure well and provide feasible solutions to sample the clustering structure from large-scale graphs.

关键词： graph sampling clustering structure top-leader nodes expansion strategies large-scale graphs

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Thin Film/Elastomer Structures for Stretchable Electronics 31

Thin Film/Elastomer Structures for Stretchable Electronics

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31st International Workshop on Active-Matrix Flatpanel Displays and Devices: TFT Technologies and FPD Materials, AM-FPD 2024

作者： Takei, Atsushi Komazaki, Yusuke Nobeshima, Taiki Kanazawa, Shusuke Kusaka, Yasuyuki Yoshida, Manabu National Institute of Advanced Industrial Science and Technology Human Augmentation Research Center Kashiwa Chiba277-0882 Japan National Institute of Advanced Industrial Science and Technology Sensing System Research Center Ibaraki Tsukuba305-8565 Japan

ISBN: (纸本)9784991216961

Stretchable devices are a challenging issue in electronics in the modem era. Conventionally, electronic devices are fabricated on rigid boards and are neither flexible nor stretchable. However, if electronic devices are stretchable, they can be smoothly attached to nonplanar surfaces, such as the human body. One method for creating stretchable devices is the use of stretchable structures. In this report, we present several types of stretchable structures, including kirigami-elastomer, wrinkle, and fiber structures, all composed of thin films and elastomers. The buckling of the thin film was used to form the stretchable structures. Because buckling is ubiquitous across materials, electronic devices with these structures can be stretchable, even if the materials are not stretchable. Since there is no need to develop stretchable materials, using stretchable structures is a promising way to enrich various stretchable devices. © 2024 FTFMD.

关键词： Flexible electronics

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Alkali Metal Ion Substituted Carboxymethyl Cellulose as Anode Polymeric Binders for Rapidly Chargeable Lithium-Ion Batteries

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Energy & Environmental Materials 2024年第1期7卷 77-82页

作者： Seoungwoo Byun Zhu Liu Dong Ok Shin Kyuman Kim Jaecheol Choi Youngjoon Roh Dahee Jin Seungwon Jung Kyung-Geun Kim Young-Gi Lee Stefan Ringe Yong Min Lee Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Korea ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311215China Intelligent Sensors Research Section Electronics and Telecommunications Research Institute(ETRI)Daejeon 34129Korea Department of Advanced Device Technology University of Science and Technology(UST)Daejeon 34113Korea Intelligent Polymer Research Institute and ARC Centre of Excellence for Electromaterials Science University of WollongongWollongong NSW 2522Australia Department of Chemistry Korea UniversitySeoul 02841Korea Energy Science and Engineering Research Center Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Korea

The increasing demand for short charging time on electric vehicles has motivated realization of fast chargeable lithium-ion batteries(LIBs).However,shortening the charging time of LIBs is limited by Li^(+)intercalation process consisting of liquid-phase diffusion,de-solvation,SEI crossing,and solid-phase ***,we propose a new strategy to accelerate the de-solvation step through a control of interaction between polymeric binder and solvent-Li^(+)*** this purpose,three alkali metal ions(Li^(+),Na^(+),and K^(+))substituted carboxymethyl cellulose(Li-,Na-,and K-CMC)are prepared to examine the effects of metal ions on their *** lowest activation energy of de-solvation and the highest chemical diffusion coefficient were observed for ***,Li-CMC cell with a capacity of 3 mAh cm^(-2)could be charged to>95%in 10 min,while a value above>85%was observed after 150 ***,the presented approach holds great promise for the realization of fast charging.

关键词： de-solvation digital twins fast charging graphite anodes polymeric binders

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Imidazole linker‐induced covalent triazine framework-ZIF hybrids for confined hollow carbon super‐heterostructures toward a long‐life supercapacitor

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Carbon Energy 2023年第10期5卷 25-39页

作者： Madagonda MVadiyar Ji‐Young Kim Jee‐Hwan Bae Kyung‐Wan Nam Department of Energy and Materials Engineering Dongguk UniversitySeoulSouth Korea Advanced Analysis&Data Center Korea Institute of Science and Technology(KIST)SeoulSouth Korea Advanced Energy and Electronic Materials Research Center Dongguk UniversitySeoulSouth Korea

Carbon super-heterostructures with high nitrogen contents from the covalent hybrid precursors of covalent triazine frameworks(CTFs)and zeolitic imidazolic frameworks(ZIFs)are scarcely explored because of CTF's ordered structure and toxic superacid that dissolves or destabilizes the metal *** solve this problem,herein,we report a straightforward two-step pathway for the covalent hybridization of disordered CTF(d–CTF)–ZIF composites via preincorporation of an imidazole(IM)linker into ordered CTFs,followed by the imidazole-site-specific covalent growth of *** carbonization of these synthesized d–CTF−IM−ZIF hybrids results in unique hollow carbon super-heterostructures with ultrahigh nitrogen content(>18.6%),high specific surface area(1663m^(2)g^(−1)),and beneficial trace metal(Co/Zn NPs)contents for promoting the redox *** proof of concept,the obtained carbon super-heterostructure(Co–Zn–NC_(SNH)–800)is used as a positive electrode in an asymmetric supercapacitor,demonstrating a remarkable energy density of 61Wh kg^(−1)and extraordinary cyclic stability of 97%retention after 30,000 cycles at the cell *** presynthetic modifications of CTF and their covalent hybridization with ZIF crystals pave the way toward new design strategies for synthesizing functional porous carbon materials for promising energy applications.

关键词： asymmetric supercapacitor defective covalent triazine frameworks hollow carbon superheterostructures linker defect

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Observation of dark edge states in parity-time-symmetric quantum dynamics

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National science Review 2023年第8期10卷 156-165页

作者： Peng Xue Xingze Qiu Kunkun Wang Barry C. Sanders Wei Yi Beijing Computational Science Research Center Key Laboratory of Quantum Information University of Science and Technology of China Chinese Academy of Sciences Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Chinese Academy of Sciences School of Physics and Optoelectronic Engineering Anhui University Shanghai Branch National Laboratory for Physical Sciences at MicroscaleUniversity of Science and Technology of China Institute for Quantum Science and Technology University of Calgary Program in Quantum Information Science Canadian Institute for Advanced Research

Topological edge states arise in non-Hermitian parity-time(PT)-symmetric systems, and manifest themselves as bright or dark edge states, depending on the imaginary components of their eigenenergies. As the spatial probabilities of dark edge states are suppressed during the non-unitary dynamics, it is a challenge to observe them experimentally. Here we report the experimental detection of dark edge states in photonic quantum walks with spontaneously broken PT symmetry, thus providing a complete description of the topological phenomena therein. We experimentally confirm that the global Berry phase in PT-symmetric quantum-walk dynamics unambiguously defines topological invariants of the system in both the PT-symmetry-unbroken and-broken regimes. Our results establish a unified framework for characterizing topology in PT-symmetric quantum-walk dynamics, and provide a useful method to observe topological phenomena in PT-symmetric non-Hermitian systems in general.

关键词： parity-time symmetry photonic quantum walks dark edge states topological invariants

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