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A Triphenylamine-Functionalized Co-Assembly Material for Record Efficiency Inverted CsPbI3Perovskite Solar Cells

Angewandte Chemie 2025年

作者： Dongfang Xu Huaiman Cao Zihao Fan Baihui Wang Yongzhe Li Rui Sun Yong Li Jieke Tan Hongjie Lei Prof. Yuwei Duan Prof. Hongtao Bian Prof. Ze Yu Prof. Zhike Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China State Key Laboratory of Fine Chemicals Frontier Science Center for Smart Materials Dalian University of Technology (DUT) Dalian 116024 China College of Materials and Chemistry & Chemical Engineering Chengdu University of Technology Chengdu 610059 China

The precise regulation of self-assembled monolayer (SAM) distribution and interfacial modification is pivotal for advancing the performance of p-i-n inverted perovskite solar cells (PSCs). Here, a new co-assembly material, 4-(aminomethyl)- N , N -diphenylaniline iodide (TPAI), is developed to make SAM orderly assembled. Density functional theory (DFT) calculation and sum frequency generation (SFG) spectroscopy reveal that TPAI binds with SAM via π-π interactions, effectively suppressing SAM aggregation and enhancing the orderliness of self-assembly. Further characterization by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) demonstrates that ─NH 3 group in TPAI coordinates with undercoordinated Pb 2+ to passivate defects of cesium lead triiodide (CsPbI 3 ) film. The TPAI modification creates a defect-minimized buried interface with optimized energy alignment, significantly improving hole extraction and transport kinetics. Consequently, the TPAI-treated CsPbI 3 PSCs achieve a high power conversion efficiency (PCE) of 21.60%, the highest reported value for inverted CsPbI 3 PSCs, maintaining 96.71% initial PCE after tracking at maximum power point (MPP) for 1400 h. This work provides a molecular-level strategy for interfacial engineering, advancing the development of efficient and durable perovskite photovoltaics.

关键词： CsPbI3 Co-assembly material Inverted perovskite solar cells Self-assembled molecules Triphenylamine

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Deformation mechanism and collapse treatment of the rock surrounding a shallow tunnel based on on-site monitoring

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Journal of Mountain Science 2020年第12期17卷 2897-2914页

作者： QIU Hong-zhi CHEN Xiao-qing WU Qi-hong WANG Ren-chao ZHAO Wan-yu QIAN Ke-jiang School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China Key Laboratory of Mountain Hazards and Earth Surface Processes Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China Hunan International Scientific and Technological Innovation Cooperation Base of Advanced Construction and Maintenance Technology of Highway Changsha University of Science&TechnologyChangsha 410114China School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China

When tunnels are constructed at shallow depths in areas with poor geological conditions,such as portal sections,valleys and hillsides in regions with granitic bedrock,considerable excavation-induced deformation of the surrounding rock may occur,potentially resulting in tunnel *** main reason for these problems is the lack of understanding of the deformation mechanism and evolution of the soft granitic rock surrounding the tunnel and the adoption of inappropriate construction technology and *** article analyzes the deformation mechanism of the rock surrounding a shallow tunnel based on in situ monitoring data as a case study and suggests that certain measures should be taken to effectively control the deformation of the surrounding rock and to minimize the potential for tunnel *** results show that the deformation of the granitic soil surrounding the tunnel can be divided into three stages:the rapid deformation stage,the slow deformation stage and the stabilization *** construction methods should be carefully selected to ensure safety during tunnel excavation in the first *** avoid secondary disasters caused by tunnel collapses,three treatment measures may be implemented as part of safety management:enhancing the monitoring of the surrounding rock deformation,adjusting the construction methods and optimizing the support *** particular,accurate monitoring data and timely information feedback play a vital role in tunnel ***,engineers with considerable engineering experience and professional knowledge are needed to analyze the monitoring data and make accurate predictions of tunnel deformation to ensure that reasonable measures are taken in the process of shallow tunnel excavation.

关键词： Shallow tunnel Surrounding rock deformation Field monitoring Treatment for collapse Information feedback

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Natural Mollusk Shells as a Potential Dental Material

SSRN

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SSRN 2023年

作者： Yan, Jiao Deng, Jingjing Jiao, Da Tan, Guoqi Wang, Qiang Liu, Zengqian Yang, Peng Wei, Yan Yi, Zhe Deng, Xuliang Zhang, Zhefeng Liaoning Provincial Key Laboratory of Oral Diseases School and Hospital of Stomatology China Medical University Shenyang110001 China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China Department of Geriatric Dentistry Beijing Laboratory of Biomedical Materials Peking University School Hospital of Stomatology Beijing100081 China School of Materials Science and Engineering University of Science and Technology of China Hefei230026 China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education School of Chemistry and Chemical Engineering Shaanxi Normal University Xi’an710119 China

The mollusk shells in Nature have evolved ingenious architectures and achieved outstanding mechanical properties, thereby demonstrating a potential for tissue engineering applications;nevertheless, despite a broad investigation of them for gaining inspiration towards guiding the design of man-made materials, the mollusk shells have rarely been explored for directly using as a biomedical material. This study offers a preliminary evaluation about the potential and feasibility of natural mollusk shells for using as dental replacements by systematically examining their aesthetic performance, machinability, and mechanical and biological properties. The shells exhibit a variety of colors with natural lusters, and can be processed into desired shapes and dimensions with good surface finish. The Strombus latissimus shells have a comparable flexural strength as human teeth, and exhibit higher fracture toughness than most of commercial dental materials along with stable crack extension featured by rising R-curve behavior owing to the effective toughening effects of crossed-lamellar architecture. Additionally, the shells display a good cytocompatibility and certain antifungal function because of their hydrophilic and negative charged surfaces with low roughness. A simple and viable approach was further exploited for enhancing the hardness of natural mollusk shells by immersing them in aqueous solutions of metal ions. The unique combination of properties makes the natural mollusk shells superior to many commercial dental materials and promising for dental applications which may represent a potentially new protocol for tissue engineering. © 2023, The Authors. All rights reserved.

关键词： Biocompatibility

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Optical gradient force in the absence of light intensity gradient

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Physical Review B 2021年第3期103卷 035103-035103页

作者： Hongxia Zheng Huajin Chen Jack Ng Zhifang Lin State Key Laboratory of Surface Physics Key Laboratory of Micro- and Nanophotonic Structures and Department of Physics Fudan University Shanghai 200433 China School of Electrical and Information Engineering Guangxi University of Science and Technology Liuzhou 545006 China Department of Physics Southern University of Science and Technology Shenzhen 518055 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

The working mechanism of optical tweezers is generally believed to be the gradient force arising from the light intensity inhomogeneity of an incident optical field. Here we demonstrate a somewhat counterintuitive phenomenon—optical trapping of chiral particles relying on the gradient force emerging in an optical field with homogeneous light intensity. This type of gradient force is shown to survive even in the Rayleigh limit, where the particle size is far smaller than the illuminating wavelength. By deriving a rigorous analytical expression for the optical force exerted on a chiral particle, the origin of such a gradient force is traced to the gradient of the magnetoelectric energy density, irrespective of the particle size. Besides enriching our understanding of the light-matter interaction, this gradient force is found to have magnitude comparable to the conventional intensity gradient-induced gradient force and to switch its direction for particles with opposite chiralities, rendering it applicable to particle chirality discrimination and identification.

关键词： Laser applications Light-matter interaction Molecule trapping & guiding Optomechanics Scattering theory

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Constructing High Utilization of Fe-N4 Single-Atom Sites by One-Step Gradient Pyrolysis for Electroreduction of O2 and Co2

SSRN

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SSRN 2022年

作者： Yang, Huijuan Zhang, Pengyang Yi, Xiaoyu Yan, Cheng Pang, Dawei Chen, Lina Wang, ShengBao Wang, Chunran Liu, Bohua Zhang, Gaini Zhou, Zhiyou Li, Xifei Institute of Advanced Electrochemical Energy Shaanxi International Joint Research Centre of Surface Technology for Energy Storage Materials School of Materials Science and Engineering Xi'an University of Technology Xi'An710048 China State Key Laboratory of Physical Chemistry of Solid Surfaces Innovation Center of Chemistry for Energy Materials College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China Institute of Microstructure and Property of Advanced Materials Beijing University of Technology Beijing100124 China

Fe-N 4 single-atom catalysts (SACs) had been investigated extensively in various energy conversion reaction. However, large amount of untouchable Fe-N 4 sites buried in the dense carbon skeletons greatly restrict the maximization of catalytic performance. Therefore, rational construction of catalysts nanostructure to effectively expose Fe-N 4 single atom sites is eagerly desired. Here, we report a one-step gradient pyrolysis method by using quaternary ammonia polysulfone (QAPS) polymer with a lower carbonization temperature to segregate precursor particles to construct mesoporous at 4-9 nm, thereby tellingly increasing the accessibility of Fe-N 4 single atom sites. Nitrite reduction method demonstrates as-prepared catalyst increased active sites density three-fold compared with catalyst without QAPS. Thus, it exhibits a terrific peak power density (1.15 W cm -2 ) in proton exchange membrane fuel cells and a superior CO partial current density (121 mA cm -2 ) with 99% Faradaic efficiency for CO at 0.5 V in flow cells. © 2022, The Authors. All rights reserved.

关键词： Carbon dioxide

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Metal-doped Mo_2C(metal = Fe,Co,Ni,Cu)as catalysts on TiO_2 for photocatalytic hydrogen evolution in neutral solution

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催化学报 2021年第1期42卷 205-216页

作者： Liu Jing Hodes Gary Yan Junqing Liu Shengzhong(Frank) School of Materials Science and Engineering Shaanxi Normal University Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Shaanxi Xi'an 710119 Department of Materials and Interfaces Weizmann Institute of Science Israel Rehovot 76100 Dalian Institute of Chemical Physics Chinese Academy of Sciences iChEM Dalian National Laboratory for Clean Energy Liaoning Dalian 116023

The neutral hydrogen evolution reaction(HER)is vital in the chemical industry,and its efficiency depends on the interior character of the ***,work function(WF)engineering is introduced via 3d metal(Fe,Co,Ni,and Cu)doping for modulating the Fermi energy level of Mo_*** defective energy level facilitates the free water molecule adsorption and,subsequently,promotes the neutral HER ***,at a current density of 10 mA/cm~2,Cu-Mo_2C exhibits the best HER performance with an overpotential of 78 mV,followed by Ni-Mo_2C,Co-Mo_2C,Fe-Mo_2C,and bare Mo_2C with 90,95,100,and 173 mV,respectively,and the corresponding Tafel slope values are 40,43,42,56,and 102 mV/*** modified WF can also lead to an enhanced photocatalytic efficiency owing to the lowered Schottky barrier and excellent carrier transition across the electrocatalyst-solution *** coupling the metal-doped Mo_2C samples with TiO_2,enhanced photocatalytic neutral HER rates are obtained in comparison to the case with bare TiO_***,the HER rates are 521,404,275,224,147,and 112 μmol/h for Cu,Ni,Co,Fe,bare Mo_2C,and bare TiO_2,***-resolved photoluminescence spectroscopy(TRPS)and ultrafast transient absorption(TA)measurements are carried out to confirm the recombination and migration of the photogenerated *** fitted τ values from the TRPS curves are 22.6,20.5,10.1,4.7,4.0,2.5,and 1.9 ns for TiO_2,TiO_2-Mo_2C,TiO_2-Fe-Mo_2C,TiO_2-Fe-Mo_2C,TiO_2-Fe-Mo_2C,TiO_2-Fe-Mo_2C,and TiO_2-Pt,***,the fitted τ values from the TA results are 31,73,and 105 ps for the TiO_2-Mo_2C,TiO_2-Cu-Mo_2C,and TiO_2-Pt samples,*** work provides in-depth insights into the WF modulation of an electrocatalyst for improving the HER performance.

关键词： 3d metal Doping Mo_2C TiO_2 Photocatalysis Water splitting Hydrogen evolution

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Bamboo Derived Activated Carbon as Highly Efficient Catalysts for the Oxidation and Adsorption of Hydrogen Sulfide at Room Temperature

SSRN

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SSRN 2023年

作者： Du, Shi Liu, Xin Liu, Yue Wang, Junhao Liu, Dongxu Yang, Jianxiao Zhang, Xin College of Resources and Environment University of Chinese Academy of Sciences Beijing101408 China Yanshan Earth Critical Zone and Surface Fluxes Research Station University of Chinese Academy of Sciences Beijing101408 China Department of Environmental Engineering College of Biology and the Environment Nanjing Forestry University Nanjing210037 China Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology College of Materials Science and Engineering Hunan University Changsha410082 China

A series of bamboo derived activated carbon (BAC) with different activation degree were prepared and tested for H2S catalytic oxidation-adsorption at room temperature. It was found that the specific surface area, pore size and defect level increased with the increase in activation degree. Besides, abundant of weak basic sites and oxygen vacancies were existed on the catalyst surface. The highest sulfur capacity (Qs)can be obtained for Na/BAC-8, which can attach 0.73g/g. And the Qs was directly related to the total pore volume and specific surface area. Meanwhile, the final sulfate and elemental sulfur products were mainly formed in small micropores ( © 2023, The Authors. All rights reserved.

关键词： Activated carbon

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Observation of giant nonlinear valley Hall effect

arXiv

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arXiv 2025年

作者： He, Pan Zhang, Min Cao, Jin Li, Jingru Liu, Hao Zhai, Jinfeng Wang, Ruibo Xiao, Cong Yang, Shengyuan A. Shen, Jian State Key Laboratory of Surface Physics Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai200433 China Hefei National Laboratory Hefei230088 China Institute of Applied Physics and Materials Engineering Faculty of Science and Technology University of Macau China Fudan University Shanghai200433 China Department of Physics Fudan University Shanghai China Shanghai Research Center for Quantum Sciences Shanghai China Zhangjiang Fudan International Innovation Center Fudan University Shanghai201210 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

The valley Hall effect (VHE) holds great promise for valleytronic applications by leveraging the valley degree of freedom. To date, research on VHE has focused on its linear response to an applied current, leaving nonlinear valley responses undetected and nonlinear valleytronic devices undeveloped. Here, we report the experimental observation of a nonlinear VHE in a graphene-hBN moiré superlattice, evidenced by the generation of second-harmonic nonlocal voltages under AC currents. Remarkably, the nonlinear VHE has magnitude surpassing the linear VHE and is highly tunable via a gate voltage, which exhibits a pair of opposite peaks on the two sides of a Dirac gap. The nonlinear signal shows quadratic scaling with driving current and quartic scaling with local resistance, setting it apart from the linear counterpart. These experimental features are consistent with the theoretical picture of nonlocal transport mediated by nonlinear VHE and linear inverse VHE. We further reveal a nonlinear inverse VHE by observing the third- and fourth-harmonic nonlocal voltages. The nonlinear VHE provides a novel mechanism for valley manipulation and enables a novel valleytronic device—the valley rectifier—that converts AC charge current into DC valley current. Copyright © 2025, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

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Femtosecond Laser Ablation Behavior of Sic/Sic Composites in Air and Water Environment

SSRN

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SSRN 2022年

作者： Wei, Jiayong Yuan, Songmei Zhang, Jiaqi Zhou, Ning Zhang, Wei Li, Jiebo An, Wenzhao Gao, Mengxuan Fu, Yanzhe R&D Center of High-efficient & Green CNC Machining Technology and Equipment School of Mechanical Engineering and Automation Beihang University Beijing100191 China National Key Laboratory of Science and Technology on Power Beam Processes AVIC Aeronautical Manufacturing Technology Research Institute Beijing100024 China Institute of Medical Photonics Beijing Advanced Innovation Center for Biomedical Engineering School of Biological Science and Medical Engineering Beihang University Beijing100191 China

SiC/SiC composites (SiC matrix with SiC fibers) play an important role in aerospace and energy fields because of their good resistance to high temperature, corrosion, oxidation and low density. In this paper, we have qualitatively and quantitatively analyzed the ablation behavior of femtosecond laser processed SiC/SiC composites in air and water environments using multiple characterization tools. The results showed that ablation in air was characterized as thermochemical corrosion dominance, while in water expressed as thermomechanical denudation and thermochemical corrosion. The temperature and oxygen content in the ablation region are the main reasons for these two corrosion mechanisms. © 2022, The Authors. All rights reserved.

关键词： Silicon carbide

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Phase Shift and Magnetic Anisotropy Induced Field Splitting of Impurity States in (Li1−xFex)OHFeSe Superconductor

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Physical Review Letters 2023年第20期130卷 206001-206001页

作者： Tianzhen Zhang Yining Hu Wei Su Chen Chen Xu Wang Dong Li Zouyouwei Lu Wentao Yang Qingle Zhang Xiaoli Dong Rui Wang Xiaoqun Wang Donglai Feng Tong Zhang Department of Physics State Key Laboratory of Surface Physics and Advanced Material Laboratory Fudan University Shanghai 200438 China Beijing Computational Science Research Center Beijing 100084 China College of Physics and Electronic Engineering Center for Computational Sciences Sichuan Normal University Chengdu 610068 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100049 China Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center for Advanced Microstructures Nanjing 210093 China School of Physics Zhejiang University Hangzhou 310058 Zhejiang China National Synchrotron Radiation Laboratory and Department of Physics University of Science and Technology of China Hefei 230026 China Shanghai Research Center for Quantum Sciences Shanghai 201315 China

Revealing the energy and spatial characteristics of impurity-induced states in superconductors is essential for understanding their mechanism and fabricating a new quantum state by manipulating impurities. Here, by using high-resolution scanning tunneling microscopy and spectroscopy, we investigate the spatial distribution and magnetic field response of the impurity states in (Li1−xFex)OHFeSe. We detect two pairs of strong in-gap states on the “dumbbell-shaped” defects. They display damped oscillations with different phase shifts and a direct phase—energy correlation. These features have long been predicted for the classical Yu-Shiba-Rusinov (YSR) state and are demonstrated here with unprecedented resolution for the first time. Moreover, upon applying magnetic field, all in-gap state peaks remarkably split into two rather than shift, and the splitting strength is field orientation dependent. Via detailed numerical model calculations, we find such an anisotropic splitting behavior can be naturally induced by a high-spin impurity coupled to an anisotropic environment, highlighting how magnetic anisotropy affects the behavior of YSR states.

关键词： Impurities in superconductors Superconductivity Numerical Renormalization Group Scanning tunneling microscopy Scanning tunneling spectroscopy

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