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Ferroelectricity of pristine Hf_(0.5)Zr_(0.5)O_(2) films fabricated by atomic layer deposition

Chinese Physics B 2023年第10期32卷 684-688页

作者：陈璐秋张晓旭冯光迪刘逸飞郝胜兰朱秋香冯晓钰屈可杨振中祁原深 Yachin Ivry Brahim Dkhil 田博博褚君浩段纯刚 Key Laboratory of Polar Materials and Devices(MOE) Ministry of EducationShanghai Center of Brain-inspired Intelligent Materials and DevicesDepartment of ElectronicsEast China Normal UniversityShanghai 200241China Zhejiang Laboratory Hangzhou 310000China Guangdong Provisional Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen 518055China Department of Materials Sciences and Engineering Guangdong Technion-Israel Institute of TechnologyShantou 515063China Department of Materials Science and Engineering Solid-State InstituteTechnion-Israel Institute of TechnologyHaifa 3200003Israel UniversitéParis-Saclay CentraleSupélecCNRS-UMR 8580Laboratoire StructuresPropriétés et Modélisation des SolidesGif-sur-Yvette 91190France State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Institute of Optoelectronics Fudan UniversityShanghai 200433China Collaborative Innovation Center of Extreme Optics Shanxi UniversityShanxi 030006China

Hafnium-based ferroelectric films,remaining their ferroelectricity down to nanoscale thickness,present a promising application for low-power logic devices and nonvolatile *** has been appealing for researchers to reduce the required temperature to obtain the ferroelectric phase in hafnium-based ferroelectric films for applications such as flexible and wearable *** work demonstrates that a remanent polarization(P_(r))value of>5μC/cm^(2)can be obtained in asdeposited Hf_(0.5)Zr_(0.5)O_(2)(HZO)films that are fabricated by thermal atomic layer deposition(TALD)under low temperature of 250℃.The ferroelectric orthorhombic phase(o-phase)in the as-deposited HZO films is detected by scanning transmission electron microscopy(STEM).This low fabrication temperature further extends the compatibility of ferroelectric HZO films to flexible electronics and avoids the cost imposed by following high-temperature annealing treatments.

关键词： Hf_(0.5)Zr_(0.5)O_(2)(HZO) ferroelectric orthorhombic without annealing

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Double Side Interfacial Optimization for Low-Temperature Stable CsPbI_(2)Br Perovskite Solar Cells with High Efficiency Beyond 16%

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Energy & Environmental materials 2022年第2期5卷 637-644页

作者： Jing Ma Jie Su Zhenhua Lin Jian He Long Zhou Tao Li Jincheng Zhang Shengzhong Liu Jingjing Chang Yue Hao State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of GrapheneSchool of MicroelectronicsXidian UniversityXi’an 710071China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi’an 710071China Centre for Spintronics and Quantum System State Key Laboratory for Mechanical Behavior of MaterialsSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China

CsPbI_(2)Br perovskite solar cells have achieved rapid development owing to their exceptional optoelectronic properties and relatively outstanding ***,open-circuit voltage(Voc)loss caused by band mismatch and charge recombination between perovskite and charge transporting layer is one of the crucial obstacles to further improve the device ***,we proposed a bilayer electron transport layer ZnO(bottom)/SnO_(2)(top)to reduce the Voc loss(Eloss)and promote device Voc by ZnO insert layer thickness modulation,which could improve the efficiency of charge carrier extraction/transfer and suppress the charge carrier *** addition,guanidinium iodide top surface treatment is used to further reduce the trap density,stabilize the perovskite film and align the energy levels,which promotes the fill factor,short-circuit current density(Jsc),and stability of the *** a result,the champion cell of double-side optimized CsPbI_(2)Br perovskite solar cells exhibits an extraordinary efficiency of 16.25%with the best Voc as high as 1.27 V and excellent thermal and storage stability.

关键词： CsPbI_(2)Br dual interfacial optimization high performance low temperature perovskite solar cells

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Antioxidant high-conductivity copper paste for low-cost flexible printed electronics

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npj Flexible electronics 2022年第1期6卷 176-184页

作者： Shuqing Hong Chimin Liu Shuqiang Hao Wenxing Fu Jian Peng Binghui Wu Nanfeng Zheng Pen-Tung Sah Institute of Micro-Nano Science and Technology State Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy MaterialsNational&Local Joint Engineering Research Center of Preparation Technology of NanomaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China

The flexible printed electronics(e.g.,wearable devices,roll-up displays,heating circuits,radio frequency identification(RFID)tags)calls for high-conductivity and low-cost materials,particularly for copper *** is still a big challenge to develop reliable copper pastes for both antioxidant and high-conductivity flexible printed films and *** this work,an antioxidant copper paste was achieved using copper microflakes with surface passivation by formate ions and thiols,with high conductivity of 13400 S cm^(−1)(the same order of magnitude of silver pastes,1.8-2.5×10^(4) S cm^(−1)).The universal applications of as-prepared copper paste in flexible printed electronics(e.g.,electromagnetic interference(EMI)shielding films,anti-fog films,and RFID tags)via screen printing and curing at 170℃ under ambient atmosphere were *** as-printed electronics showed high performance in flexibility,stability,and *** work shows the great potential of anti-oxidation copper pastes in low-cost flexible printed electronics for commercial usage.

关键词： paste copper cost

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Stabilizing layered superlattice MoSe_(2) anodes by the rational solvation structure design for low-temperature aqueous zinc-ion batteries

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Electron 2023年第1期1卷 70-79页

作者： Zeheng Lv Yuanhong Kang Rong Tang Jin Yang Guanhong Chen Yuhan Hu Pengxiang Lin Huiya Yang Qilong Wu Minghao Zhang Fenghua Chen Yueying Peng Yang Yang Jinbao Zhao State Key Laboratory of Physical Chemistry of Solid Surfaces State-Province Joint Engineering Laboratory of Power Source Technology for New Energy VehicleTan Kah Kee Innovation Laboratory(IKKEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamenChina School of Resources and Chemical Engineering Sanming UniversitySanmingChina International Center for Young Scientists Center for Green Research on Energy and Environmental MaterialsNational Institute for Material ScienceTsukubaIbarakiJapan

Aqueous zinc-ion batteries(AZIBs)have attracted widespread attention due to their intrinsic merits of low cost and high ***,the poor thermodynamic stability of Zn metal in aqueous electrolytes inevitably cause Zn dendrites growth and interface parasitic side reactions,resulting in unsatisfactory cycling stability and low Zn *** Zn anode with intercalation-type anodes have emerged as a promising alternative strategy to overcome the above issues but the lack of appropriate anode materials is becoming the ***,the interlayer structure of MoSe_(2) anode is preintercalated with long-chain polyvinyl pyrrolidone(PVP),constructing a periodically stacked p-MoSe_(2)superlattice to activate the reversible Zn^(2+) storage performance(203 mAh g^(−1)at 0.2 A g^(−1)).To further improve the stability of the superlattice structure during cycling,the electrolyte is also rationally designed by adding 1,4-Butyrolactone(γ-GBL)additive into 3 M Zn(CF_(3)SO_(3))_(2),in whichγ-GBL replaces the H2O in Zn^(2+) solvation *** preferential solvation ofγ-GBL with Zn^(2+)effectively reduces the water activity and helps to achieve an ultra-long lifespan of 12,000 cycles for p-MoSe_(2).More importantly,the reconstructed solvation structure enables the operation of p-MoSe_(2)||ZnxNVPF(Na3V2(PO4)2O_(2)F)AZIBs at an ultra-low temperature of−40°C,which is expected to promote the practical applications of AZIBs.

关键词： intercalation-type anodes p-MoSe_(2)||Zn_(x)NVPF periodically stacked p-MoSe_(2)superlattice solvation sheath ultra-long lifespan

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Mitigating fast thermal instability by engineered laser sweep in AlN soliton microcomb generation

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Photonics research 2023年第8期11卷 I0012-I0020页

作者： KEWEI LIU ZIHAO WANG SHUNYU YAO YANAN GUO JIANCHANG YAN JUNXI WANG CHANGXI YANG CHENGYING BAO State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua UniversityBeijing 100084China Center for Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Research and Development Center for Solid State Lighting Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Transient thermal instability represents a significant challenge in generating soliton *** laser sweep can be an efficient method to mitigate thermal instability,but it requires an ultrahigh laser sweep rate for crystalline microresonators with fast thermal ***,we engineer a laser sweep waveform to generate AlNon-sapphire soliton microcombs with an intermediate sweep speed(<30 GHz∕μs).Two laser sweep methods with backward plus forward tuning or two-step backward tuning added after the fast forward laser sweep were demonstrated to stabilize *** the soliton number is found to be useful to stabilize solitons in fast laser *** effectiveness of the methods was numerically *** measurements and simulations also reveal the impacts of different thermal relaxation processes occurring at quite different time scales on thermal *** requirement of the laser sweep protocols is discussed.

关键词： tuning laser sapphire

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Nonlinear optical characterization of Ag2Se and PbSe colloidal quantum dots using 1030 nm femtosecond pulses

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Optical and Quantum electronics 2024年第12期56卷 1-17页

作者： Ganeev, Rashid A. Bejoy, Namitha Brijit Piatkowski, Piotr A. Boltaev, Ganjaboy S. Aslanov, Sergey V. Zvyagin, Andrey I. Smirnov, Mikhail S. Ovchinnikov, Oleg V. Alnaser, Ali S. Materials Research Center College of Arts and Science American University of Sharjah Sharjah26666 United Arab Emirates Department of Optics and Spectroscopy Voronezh State University Voronezh394018 Russia TIIAME National Research University Tashkent100000 Uzbekistan Department of Sciences Western Caspian University BakuAZ1001 Azerbaijan Department of Physics College of Arts and Sciences American University of Sharjah Sharjah26666 United Arab Emirates Materials Science and Engineering Program College of Arts and Sciences American University of Sharjah Sharjah26666 United Arab Emirates

Nonlinear optical characteristics of chemically prepared silver selenide (Ag2Se, 3.7 nm) and lead selenide (PbSe, 6.3 nm) colloidal quantum dots (QDs) are investigated using the 1030 nm femtosecond pulses. Ag2Se QDs demonstrated two-photon absorption followed by saturable absorption. PbSe QDs initially showed the saturable absorption at small intensities of 1030 nm probe pulses, followed by reverse saturable absorption at stronger excitation. The difference in the positive nonlinear optical absorption mechanisms in these two QD colloids is attributed to their different bandgaps. The studied QD colloids exhibited the Kerr-induced positive nonlinear refraction. Transient absorption studies of the QDs showed that photoexcitation creates a hot exciton that forms band-edge exciton within 1.2 ps after excitation. Most of the electron-hole pairs further recombine through band-to-band recombination with a time constant of 1490 ps. Furthermore, the results from the transient absorption studies indicate the contribution of trap-assisted recombination occurs on a time scale exceeding that of the experimental time window. © The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature 2024.

关键词： Semiconductor quantum dots

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WO_(3)@Fe_(2)O_(3) Core-Shell Heterojunction Photoanodes for Efficient Photoelectrochemical Water Splitting

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Chinese Journal of Structural Chemistry 2022年第8期41卷 25-30页

作者： Guobing Mao Heng Wu Tianyang Qiu Dingjie Bao Longjie Lai Wenguang Tu Qi Liu School of Materials Science and Engineering Anhui Polytechnic UniversityWuhuAnhui 241000China School of Mechanical Engineering Anhui Institute of Information TechnologyWuhuAnhui 241100China Key Laboratory of Modern Acoustics(MOE) Institute of AcousticsSchool of PhysicsEco-materials and Renewable Energy Research Center(ERERC)National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresJiangsu Key Laboratory for Nano Tech-nologyNanjing UniversityNanjing 210093China School of Science and Engineering The Chinese University of Hong KongShenzhenGuangdong 518172China

Photoelectrochemical(PEC) hydrogen production from water splitting is a green technology to convert solar energy into renewable hydrogen fuel. The construction of host/guest architecture in semiconductor photoanodes has been proven to be an effective strategy to improve solar-to-fuel conversion efficiency. In this study, WO_(3)@Fe_(2)O_(3) core-shell nanoarray heterojunction photoanodes are synthesized from the in-situ decomposition of WO_(3)@Prussian blue(WO_(3)@PB) and then used as host/guest photoanodes for photoelectrochemical water splitting, during which Fe_(2)O_(3) serves as guest material to absorb visible solar light and WO_(3) can act as host scaffolds to collect electrons at the contact. The prepared WO_(3)@Fe_(2)O_(3) shows the enhanced photocurrent density of 1.26 m A cm^(-2)(under visible light) at 1.23 V. vs RHE and a superior IPEC of 24.4% at 350 nm, which is higher than that of WO_(3)@PB and pure WO_(3)(0.43 m A/cm^(-2) and 16.3%, 0.18 m A/cm^(-2) and 11.5%) respectively, owing to the efficient light-harvesting from Fe_(2)O_(3) and the enhanced electron-hole pairs separation from the formation of type-Ⅱ heterojunctions, and the direct and ordered charge transport channels from the one-dimensional(1D) WO_(3) nanoarray nanostructures. Therefore, this work provides an alternative insight into the construction of sustainable and cost-effective photoanodes to enhance the efficiency of the solar-driven water splitting.

关键词： host/guest photoelectrodes WO_(3) a-Fe_(2)O_(3) core-shell nanostructures one-dimensional nanoarray

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铌酸锂调控固态电解质电场结构促进锂离子高效传输

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science China materials 2024年第6期67卷 1947-1955页

作者：刘晓潼温博华钟贵明程醒简翠英郭勇黄妍斐马家宾史沛然陈立坤张丹丰吴士超柳明吕伟贺艳兵康飞宇 Shenzhen All-Solid-State Lithium Battery Electrolyte Engineering Research Center Institute of Materials Research(IMR)Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Laboratory of Advanced Spectro-electrochemistry and Li-ion Batteries Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023China Department of Mechanical Engineering York UniversityTorontoON M3J 1P3Canada Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518055China

聚合物基固态电解质得益于其易加工性,最有希望应用于下一代固态锂金属电池.目前,聚合物基态电解质的离子电导率提升策略多为加入导锂陶瓷以构建离子传输通道,其提升程度有限.电场在锂离子输运过程中存在重要影响,目前研究中有关电场对... 详细信息

聚合物基固态电解质得益于其易加工性,最有希望应用于下一代固态锂金属电池.目前,聚合物基态电解质的离子电导率提升策略多为加入导锂陶瓷以构建离子传输通道,其提升程度有限.电场在锂离子输运过程中存在重要影响,目前研究中有关电场对锂离子传输的影响机制尚不明确.本文将兼具高离子电导率和高介电常数的铌酸锂嵌入聚偏氟乙烯基体中,设计了一种新型复合固态电解质.铌酸锂颗粒有效调节电解质内部电场结构,增强了离子输运方向电场强度,实现了离子电导率的大幅提升(7.39×10^(-4)S cm^(-1),25℃).该电解质匹配高镍正极和锂金属负极的固态电池可稳定循环1000次以上,容量保持率为72%.该研究为设计下一代固态锂电池用高离子电导复合固态电解质提供了新的策略.

关键词： lithium niobate solid-state electrolytes dielectric ceramics electric field regulation

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Three-dimensional-printed polycaprolactone scaffolds with interconnected hollow-pipe structures for enhanced bone regeneration

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Regenerative Biomaterials 2022年第1期9卷 471-479页

作者： Jiahua Duan Dong Lei Chen Ling Yufeng Wang Zhicheng Cao Ming Zhang Huikang Zhang Zhengwei You Qingqiang Yao Department of Orthopaedic Surgery Nanjing First HospitalNanjing Medical UniversityNanjing 210006China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringInstitute of Functional MaterialsDonghua UniversityShanghai 201620China Research Base of Textile Materials for Flexible Electronics and Biomedical Applications(China Textile Engineering Society) Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineShanghai 201620China Department of Cardiology Shanghai 9th People’s HospitalShanghai Key Laboratory of Tissue EngineeringSchool of MedicineShanghai Jiao Tong UniversityShanghai 200011China

Three-dimensional(3D)-printed scaffolds are widely used in tissue engineering to help regenerate critical-sized bone ***,conventional scaffolds possess relatively simple porous structures that limit the delivery of oxygen and nutrients to cells,leading to insufficient bone ***,in the present study,perfusable and permeable polycaprolactone scaffolds with highly interconnected hollow-pipe structures that mimic natural micro-vascular networks are prepared by an indirect onepot 3D-printing *** vitro experiments demonstrate that hollow-pipe-structured(HPS)scaffolds promote cell attachment,proliferation,osteogenesis and angiogenesis compared to the normal non-hollow-pipe-structured ***,in vivo studies reveal that HPS scaffolds enhance bone regeneration and vascularization in rabbit bone defects,as observed at 8 and 12weeks,***,the fabricated HPS scaffolds are promising candidates for the repair of critical-sized bone defects.

关键词： three-dimensional printing interconnected hollow-pipe structure bone regeneration vascularization polycaprolactone

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Observation of magnetic domain evolution in constrained epitaxial Ni–Mn–Ga thin films on MgO(0 0 1) substrate

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Journal of materials science & Technology 2022年第7期102卷 56-65页

作者： Bo Yang Ivan Soldatov Fenghua Chen Yudong Zhang Zongbin Li Haile Yan Rudolf Schäfer Dunhui Wang Claude Esling Xiang Zhao Liang Zuo Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China Institute for Metallic Materials Leibniz Institute for Solid State and Materials Research(IFW)DresdenHelmholtzstrasse 2001069 DresdenGermany Institute of Natural Sciences Ural Federal University620002 EkaterinburgRussia Department of Physics School of Applied ScienceTaiyuan University of Science and TechnologyTaiyuan 030024China Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux(LEM3) CNRS UMR 7239Universitéde Lorraine57045 MetzFrance Institute for Materials Science Dresden University of Technology01062 DresdenGermany National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory for Nanotechnology and Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Epitaxial Ni–Mn–Ga thin films have promising application potential in micro-electro-mechanical sensing and actuation systems. To date, large abrupt magnetization changes have been observed in some epitaxial Ni–Mn–Ga thin films, but their origin-either from magnetically induced martensite variant reorientation(MIR) or magnetic domain evolution-has been discussed controversially. In the present work, we investigated the evolutions of the magnetic domain and microstructure of a typical epitaxial Ni–Mn–Ga thin film through wide-field magneto-optical Kerr-microscopy. It is demonstrated that the abrupt magnetization changes in the hysteresis loops should be attributed to the magnetic domain evolution instead of the MIR.

关键词： Ni–Mn–Ga thin films Magnetic field-induced variant reorientation Magnetic domains Magnetization process Magneto-optical Kerr microscopy

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