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Effective electron extraction from active layer for enhanced photodetection of photoconductive type detector with structure of Au/CH 3 NH 3 PbI 3 /Au

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Organic Electronics 2019年 74卷 197-203页

作者： Han Su Lina Meng Yucheng Liu Yunxia Zhang Mingxin Hu Zhou Yang Shengzhong (Frank) 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 Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China iChEM Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Increasing the carrier concentration as well as carrier life time could be effective ways to increase the photoresponse of a photoconductive type photodetector. In this paper, layer-structure photodetectors have been fabricated by connecting CH 3 NH 3 PbI 3 film with and without electron transport layer (SnO 2 and SnO 2 /PCBM bilayer). We found that the electron extraction at the electron transport layer and MAPbI 3 interface will boost the photocurrent and responsivity, and faster electron extraction will result in a higher photocurrent improvement. At the same time, the closer is the distance of the interface to the photogenerated electron-hole pairs, the larger is the photocurrent enhancement. The largest photocurrent increasement is almost 3 times the initial value, which increases from 1.54 μA to 6.10 μA.

关键词： Perovskite Photodetector Charge extraction Photo-response

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Long-range propagation of magnon polaritons in a canted antiferromagnet

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Physical Review Applied 2025年第6期23卷 L061002-L061002页

作者： Hanchen Wang Jinlong Wang Kanglin Yu Lutong Sheng Yongjian Zhou Rundong Yuan Chensong Hua Weichao Yu Junfeng Hu Jilei Chen Cheng Song Jean-Philippe Ansermet Mehrdad Elyasi Gerrit E.W. Bauer Haiming Yu Fert Beijing Institute MIIT Key Laboratory of Spintronics School of Integrated Circuit Science and Engineering Beihang University Beijing 100191 China International Quantum Academy Shenzhen 518048 China Department of Materials ETH Zurich Zurich 8093 Switzerland Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 China Cavendish Laboratory Department of Physics University of Cambridge Cambridge CB3 0HE United Kingdom Institute for Nanoelectronic Devices and Quantum Computing State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Zhangjiang Fudan International Innovation Center Fudan University Shanghai 201210 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Institute of Physics École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland WPI Advanced Institute for Materials Research Tohoku University Sendai 980-8577 Japan Kavli Institute for Theoretical Sciences University of the Chinese Academy of Sciences Beijing 100190 China Institute for Materials Research Tohoku University Sendai 980-8577 Japan

We report strong coupling between magnons and cavity photons in a single-crystalline slab of α-Fe2O3 (hematite) with canted antiferromagnetic order at room temperature. The hybridized magnon polaritons propagate over many millimeters due to their high group velocities, as experimentally characterized using time-of-flight spectroscopy. The conventional dipolar and spin-orbit-interaction-induced chirality can explain an observed nonreciprocity. Our findings highlight the potential of antiferromagnetic magnon polaritons for on-chip spin-based information technologies.

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Molecular Doping of Flexible Lead-Free Perovskite-Polymer Thick Membranes for High-Performance X-Ray Detection

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Angewandte Chemie 2022年第41期134卷

作者： Xinmei Liu Haojin Li Qingyue Cui Shumei Wang Chuang Ma Nan Li Nuo Bu Tinghuan Yang Xin Song Yucheng Liu Zhou Yang Kui Zhao Shengzhong (Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 P. R. China Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China Department of Chemical Physics Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) University of Science and Technology of China (USTC) Hefei 230026 P. R. China Solar and Photovoltaic Engineering Research Center (SPERC) King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia

X-ray detectors have broad applications in medicine and industry. Although flexible lead-free perovskite films are competitive because of their lightweight and low toxicity, they are less efficient due to low charge transport. Herein, we report low-toxicity, flexible X-ray detectors based on p-type doped MA 3 Bi 2 I 9 (MA=methylammonium) perovskite-filled membranes (PFMs). Strong coordination between dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) and MA 3 Bi 2 I 9 and the establishment of charge-transfer complex (CPX) improved the conductivity by four times. The flexible X-ray detector achieved a high sensitivity of 2065 μC Gy air −1 cm −2 and an ultra-low detection limit of 2.71 nGy air s −1 , which is among the highest values in all environmentally friendly flexible X-ray detectors. Importantly, the PFMs retained excellent charge transport under mechanical stress. All of those make flexible MA 3 Bi 2 I 9 membranes more competitive as next-generation X-ray detection.

关键词： Doping Flexible Lead-Free Membrane Perovskite

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Highly Stable Orange-Red Long-Persistent Luminescent CsCdCl3:Mn2+Perovskite Crystal

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Angewandte Chemie 2022年第48期134卷

作者： Dr. Shuangshuang He Prof. Qinping Qiang Dr. Tianchun Lang Dr. Mingsheng Cai Prof. Tao Han Dr. Houjiang You Prof. Lingling Peng Prof. Shixiu Cao Prof. Bitao Liu Dr. Xiaolong Jing Prof. Bi Jia Chongqing Key Laboratory of Materials Surface & Interface Science Research Institute for New Materials Technology Chongqing University of Arts and Sciences Chongqing 402160 China School of Material Science and Engineering Chongqing University of Technology Chongqing 400054 China School of Advanced Manufacturing Technologies National Research Tomsk Polytechnic University Tomsk 634050 Russia School of Metallurgy and Materials Engineering Chongqing University of Science and Technology Chongqing 401331 China Contribution: Supervision (lead)

Halide perovskite has been widely studied as a new generation of photoelectronic materials. However, their thermal and humidity-induced emission quenching have greatly limited their utility and reliability. Here, we report a hexagonal Mn 2+ -doped CsCdCl 3 perovskite crystal that possesses stable photoluminescence (PL) at both high temperature and humidity. The room temperature long-persistent luminescence (LPL) of the single crystals lasts up to 1480 s and can be adjusted by changing the concentration of Mn 2+ ion doping. The characteristic emission of d-d transition of Mn 2+ is realized, and the photoluminescence quantum yield (PLQY) is up to 91.4 %, it can maintain more than 90 % of the initial PL spectral integral area at 150 °C (423 K). High humid stability PL can be achieved more than 75 % of the initial PL intensity after 55 days of immersion in water. These excellent properties show the application prospect of the LPL material in lighting indication and anti-counterfeiting.

关键词： Hexagonal Perovskite High Stability Lead-Free Luminescent Materials Mn2+ Doping

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Bonding performance and mechanism of a heat-resistant composite precursor adhesive (Rt-1000^◦ c) for tc4 titanium alloy

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Journal of Micromechanics and Molecular Physics 2020年第4期5卷

作者： Wang, Mingchao Bu, Fanxing Zhou, Cunjun Zhou, Qingjun Wei, Tong Liu, Jiachen Zhai, Wenzheng College of Science Civil Aviation University of China Tianjin 300300 China College of Aeronautical Engineering Civil Aviation University of China Tianjin 300300 China School of Materials and Engineering Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin 300072 China State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology 1037 Luoyu Road Wuhan 430074 China

To facilitate the repairing and connecting processes for the non-main bearing TC4 alloy, a high-temperature (up to 1000◦ C) resistant adhesive that is converted to the composite of intermetallics and ceramics is prepa... 详细信息

To facilitate the repairing and connecting processes for the non-main bearing TC4 alloy, a high-temperature (up to 1000^◦ C) resistant adhesive that is converted to the composite of intermetallics and ceramics is prepared. The composition evolution of the adhesive, the structure changes in the bonding layer, the reaction process at interfaces and the fracture mode of joints are comprehensively studied to explore its bonding mechanism. The results show that chemical bonding mechanism based on the formation of Ti₅ Si₃ plays a critical role at 600^◦ C, and acts as the crucial one at elevated temperatures. As the reaction interlayer (2–5 µm) is far thinner than the entire bonding layer (60–70 µm), mechanical properties of the adhesive dominate the bonding performance, which is tied up with the composition and structure evolution. The differ of coefficient of thermal expansion (CTE) between the adhesive and the substrate remains lower than 3 × 10⁻⁶ K⁻¹ in range of 500–1000^◦ C. Specifically, the formation of composites from intermetallics and ceramics improves the mechanical properties and heat-resistant of the adhesive. The bonding strength reaches ∼40 MPa after pre-treatment at 1000^◦ C without pressure, and remains over 30 MPa within the normal operating temperature range of 500–700^◦ C. © World Scientific Publishing Company.

关键词： Bonding mechanism Composition evolution Heat-resistant adhesive High-temperature bonding performance Interfacial reaction Thermal cycles

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Recoverable Flexible Perovskite Solar Cells for Next-Generation Portable Power Sources

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Angewandte Chemie 2023年第40期135卷

作者： Jieqiong Liu Prof. Tao Ye Prof. Dongqu Yu Prof. Shengzhong (Frank) Liu Prof. Dong Yang Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Dalian 116023 China Contribution: Writing - original draft (lead) Ministry of Education Key Laboratory of Micro/Nano Systems for Aerospace Northwestern Polytechnical University Xi'an 710072 China Contribution: Writing - review & editing (supporting) School of Physics and Electronic Technology Liaoning Normal University Dalian 116029 China Contribution: Project administration (supporting) Writing - review & editing (equal) Contribution: Supervision (lead) Contribution: Supervision (lead) Writing - original draft (equal) Writing - review & editing (lead)

Flexible perovskite solar cells (FPSCs) with excellent recoverability show a wide range of potential applications in portable power sources. The recoverability of FPSCs requires outstanding bendability of each functional layer, including the flexible substrates, electrodes, perovskite light absorbers, and charge transport materials. This review highlights the recent progress and practical applications of high-recoverability FPSCs, and illustrates the routes toward improvement of the recoverability and environmental stability through the choice of flexible substrates and the preparation of high-quality perovskite films, as well as the optimization of charge-selective contacts. In addition, we explore the intrinsic properties of each functional layer from the physical perspective and analyze how to select suitable functional layers. Additionally, some effective strategies are summarized, including material modification engineering of selective contacts, additives and interface engineering of interlayers, which can release mechanical stress and increase the power-conversion efficiency (PCE) and recoverability of the FPSCs. The challenges of making high-performance FPSCs with long-term stability and high recoverability are discussed. Finally, future applications and perspectives for FPSCs are discussed, aiming to promote more extensive commercialization processes for lightweight and durable FPSCs.

关键词： Flexible Perovskite Portable Recoverable Solar Cell

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Anomalous helimagnetic domain shrinkage due to the weakening of the Dzyaloshinskii-Moriya interaction in CrAs

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Physical Review B 2020年第10期102卷 104432-104432页

作者： B. Y. Pan H. C. Xu Y. Liu R. Sutarto F. He Y. Shen Y. Q. Hao J. Zhao Leland Harriger D. L. Feng State Key Laboratory of Surface Physics Department of Physics and Advanced Materials Laboratory Fudan University Shanghai 200433 China School of Physics and Optoelectronic Engineering Ludong University Yantai Shandong 264025 China Center for Correlated Matter Zhejiang University Hangzhou 310058 China Canadian Light Source Saskatoon Saskatchewan Canada S7N 2V3 NIST Center for Neutron Research National Institute of Standards and Technology 100 Bureau Drive Gaithersburg Maryland 20899 USA Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China Hefei National Laboratory for Physical Science at Microscale and Department of Physics University of Science and Technology of China Hefei Anhui 230026 China

CrAs is a well-known helimagnet with the double-helix structure originating from the competition between the Dzyaloshinskii-Moriya interaction (DMI) and antiferromagnetic exchange interaction J. By resonant soft-x-ray scattering, we observe the magnetic peak (0 0 qm) that emerges at the helical transition with TS≈267.5K. Intriguingly, the helimagnetic domains significantly shrink on cooling below ∼255K, opposite to the conventional thermal effect. The weakening of DMI on cooling is found to play a critical role here. It causes the helical wave vector to vary, ordered spins to rotate, and extra helimagnetic domain boundaries to form at local defects, thus leading to the anomalous shrinkage of helimagnetic domains. Our results indicate that the size of magnetic helical domains can be controlled by tuning DMI in certain helimagnets.

关键词： Exchange interaction Magnetic domains Magnetism Chiral magnets Noncollinear magnets Strongly correlated systems Resonant elastic x-ray scattering X-ray absorption spectroscopy

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Evidence for ferromagnetic order in the CoSb layer of LaCoSb2

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Physical Review B 2020年第15期101卷 155138-155138页

作者： Muyuan Zou Jianan Chu Hui Zhang Tianzhong Yuan Peng Cheng Wentao Jin Da Jiang Xuguang Xu Wenjie Yu Zhenghua An Xinyuan Wei Gang Mu Wei Li State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China University of Chinese Academy of Sciences Beijing 100049 China Department of Physics Renmin University of China Beijing 100872 China Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education) School of Physics Beihang University Beijing 100191 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Jiangsu 210093 China

The emergence of unconventional superconductivity is generally considered to be related to spin fluctuations. Unveiling the intriguing behaviors of spin fluctuations in parent compounds with layered transition-metal ions may shed light on the search for exotic unconventional superconductors. Here, based on the framework of the first-principles calculations, we theoretically propose that LaCoSb2 is a weak antiferromagnetic layered metal with an in-plane ferromagnetic moment of 0.88μB at the Co sites, as a candidate parent compound of the cobalt-based superconductors. Importantly, this theoretical finding is experimentally supported by our magnetization measurements on polycrystalline samples of LaCo0.78Sb2. Following the symmetry analysis, we suggest a possible p-wave superconductivity hosted in doped LaCoSb2 emerging at the verge of ferromagnetic spin fluctuations, which implies potential applications in topological quantum computing in future.

关键词： Electronic structure Magnetic interactions Superconductivity Topological superconductors Unconventional superconductors Density functional calculations Heisenberg model

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Intrinsic Mechanism for Anisotropic Magnetoresistance and Experimental Confirmation in CoxFe1−x Single-Crystal Films

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Physical Review Letters 2020年第9期125卷 097201-097201页

作者： F. L. Zeng Z. Y. Ren Y. Li J. Y. Zeng M. W. Jia J. Miao A. Hoffmann W. Zhang Y. Z. Wu Z. Yuan Department of Physics State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Center for Advanced Quantum Studies and Department of Physics Beijing Normal University Beijing 100875 China Department of Physics Oakland University Rochester Michigan 48309 USA Materials Science Division Argonne National Laboratory Lemont Illinois 60439 USA Shanghai Research Center for Quantum Sciences Shanghai 201315 China

Using first-principles transport calculations, we predict that the anisotropic magnetoresistance (AMR) of single-crystal CoxFe1−x alloys is strongly dependent on the current orientation and alloy concentration. An intrinsic mechanism for AMR is found to arise from the band crossing due to magnetization-dependent symmetry protection. These special k points can be shifted towards or away from the Fermi energy by varying the alloy composition and hence the exchange splitting, thus allowing AMR tunability. The prediction is confirmed by delicate transport measurements, which further reveal a reciprocal relationship of the longitudinal and transverse resistivities along different crystal axes.

关键词： Anisotropic magnetoresistance Ferromagnets First-principles calculations Hall bar Resistivity measurements

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[email protected] core-shell nanowires towards oxygen reduction reaction

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Chemical engineering Journal 2021年 421卷

作者： Qi Xue Hui-Ying Sun Ya-Nan Li Ming-Jun Zhong Fu-Min Li Xinlong Tian Pei Chen Shi-Bin Yin Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province 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 710062 PR China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine Chemistry School of Chemical Engineering and Technology Hainan University Haikou 570228 PR China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials Guangxi University Nanning Guangxi 530004 PR China

Noble metal based one-dimensionally (1D) bimetallic nanostructures are attracting increasing interest in energy conversion field because of their structural advantages and tunable chemical composition. At present, the facile and efficient synthesis of high-quality Au-core noble metal-shell nanowires still maintains the challenge. Herein, we develop a feasible one-pot chemical-reduction strategy to rapidly synthesize high-quality [email protected] core–shell nanowires ( [email protected] CSNWs) in 1-naphthol ethanol solution and explore their potential application in electrocatalysis. Expermattial results show the formation core–shell structure originates from the deposition-growth of Ir atoms at preferentially generated Au nanowires surface. When using as an electrocatalyst towards oxygen reduction reaction (ORR) in alkaline media, [email protected] CSNWs show Pt-like ORR electroactivity due to the compositional synergism effect and structural advantages of 1D nanowires, accompanying with excellent durability and extremely enhanced methanol tolerance towards ORR.

关键词： Low temperature fuel cells Pt-free electrocatalyst Core-shell structure Methanol tolerance Oxygen reduction reaction

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