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Surface passivation by multifunctional carbon dots toward highly efficient and stable inverted perovskite solar cells

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Journal of Energy Chemistry 2023年第11期86卷 9-15,I0001页

作者： Qi Cao Yixin Zhang Xingyu Pu Junsong Zhao Tong Wang Kui Zhang Hui Chen Xilai He Jiabao Yang Cheng Zhang Xuanhua Li State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072ShaanxiChina School of Chemistry and Chemical Engineering Anhui University of TechnologyMaanshan 243032AnhuiChina

Interfacial imperfections between the perovskite layer and the electron transport layer(ETL)in perovskite solar cells(PSCs)can lead to performance loss and negatively influence long-term operational ***,we introduce an interface engineering method to modify the interface between perovskite and ETL by using multifunctional carbon dots(CDs).C=O in the CDs can chelate with the uncoordinated Pb2+in the perovskite material,inhibit interfacial recombination,and enhance the performance and stability of *** addition,–OH in CDs forms hydrogen bonds with I-and organic cation in perovskite,inhibiting light-induced I2release and organic cation volatilization,causing irreversible degradation of perovskite films,thereby enhancing the long-term operational stability of ***,we achieve the champion inverted device with an efficiency of 24.02%.The CDs-treated PSCs exhibit high operational stability,and the maximum power point tracking only attenuates by 12.5%after 1000 *** modification engineering supported by multifunctional quantum dots can accelerate the road to stable PSCs.

关键词： Interfacial engineering Carbon dots Non-radiative recombination

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Interface optimization and defects suppression via Na F introduction enable efficient flexible Sb_(2)Se_(3) thin-film solar cells

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Journal of Energy Chemistry 2024年第3期90卷 165-175,I0006页

作者： Mingdong Chen Muhammad Ishaq Donglou Ren Hongli Ma Zhenghua Su Ping Fan David Le Coq Xianghua Zhang Guangxing Liang Shuo Chen Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060GuangdongChina State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004GuangxiChina CNRS ISCR(Institut des Sciences Chimiques de Rennes)UMR 6226Universitéde RennesRennes F-35000France

Sb_(2)Se_(3) with unique one-dimensional(1D) crystal structure exhibits exceptional deformation tolerance,demonstrating great application potential in flexible ***,the power conversion efficiency(PCE) of flexible Sb_(2)Se_(3) photovoltaic devices is temporarily limited by the complicated intrinsic defects and the undesirable contact ***,a high-quality Sb_(2)Se_(3) absorber layer with large crystal grains and benign [hkl] growth orientation can be first prepared on a Mo foil *** NaF intermediate layer is introduced between Mo and Sb_(2)Se_(3),which can further optimize the growth of Sb_(2)Se_(3)thin ***,positive Na ion diffusion enables it to dramatically lower barrier height at the back contact interface and passivate harmful defects at both bulk and *** a result,the champion substrate structured Mo-foil/Mo/NaF/Sb_(2)Se_(3)/CdS/ITO/Ag flexible thin-film solar cell delivers an obviously higher efficiency of 8.03% and a record open-circuit voltage(V_(OC)) of 0.492 *** flexible Sb_(2)Se_(3) device also exhibits excellent stability and flexibility to stand large bending radius and multiple bending times,as well as superior weak light photo-response with derived efficiency of 12.60%.This work presents an effective strategy to enhance the flexible Sb_(2)Se_(3) device performance and expand its potential photovoltaic applications.

关键词： Sb_(2)Se_(3) Flexible solar cells NaF intermediate layer Interface optimization Defects suppression

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synthesis,formation mechanism,and intrinsic physical properties of several As/P-containing MAX phases

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Journal of materials Science & technology 2023年第2期133卷 23-31页

作者： Hongxiang Chen Sheng Li Jun Deng Zhilong Zhang Jianeng Huang Fa Chang Li Huang Shixuan Du Pinqiang Dai School of Materials Science and Engineering Fujian University of TechnologyFuzhou 350118China Institute of Physics&University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fuzhou 350118China Center for Advanced Energy and Functional Materials Fujian University of TechnologyFuzhou 350118China Songshan Lake Materials Laboratory Dongguan 523808China CAS Key Laboratory of Vacuum Physics Beijing 100049China

321 phases are an atypical series of MAX phases,in which A=As/P,with superior elastic properties,fea-turing in the MA-triangular-prism bilayers in the crystal *** now,besides Nb 3 As 2 C,the pure phases of the other 321 compounds have not been realized,hampering the study of their intrinsic ***,molten-salt sintering(MSS)and solid-state synthesis(SSS)were applied to synthesize As/P-containing 321 phases and 211 *** the phase composition of the end-product via multiple-phase Rietveld refinement,we found that MSS can effectively improve the purity of P-containing MAX phases,with the phase content up to 99%in Nb_(3)P_(2)C and 75.4(5)%in Nb 2 *** contrast,MSS performed poorly on As-containing MAX phases,only 8.9(4)%for Nb 3 As 2 C and 64(2)%for Nb 2 AsC,as opposed to the pure phases obtained by *** experimental analyses combined with first-principles calculations reveal that the dominant formation route of Nb_(3)P_(2)C is through NbP+Nb+C→Nb_(3)P_(2)***,we found that the benefits of MSS on P-containing MAX phases are on the facilitation of three consid-ered chemical reaction routes,especially on Nb 2 PC+NbP→Nb_(3)P_(2)***,the intrinsic physical properties and Fermi surface topology of two 321 phases consisting of electron,hole,and open orbits are revealed theoretically and experimentally,in which the electron carriers are dominant in electrical *** feasible synthesis methods and the formation mechanism are instructive to obtain high-purity As/P-containing MAX phases and explore new MAX ***,the intrinsic physical properties will give great support for future applications on 321 phases.

关键词： MAX phase Molten-salt synthesis Chemical reaction route Metallic ceramics Formation mechanism Quasi-harmonic approximation

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Holographic Polymer Nanocomposites with High Refractive Index Modulation by Doping Liquid Crystal E6M

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Chinese Journal of Polymer Science 2024年第7期42卷 926-935,I0006页

作者： Meng-Yun Wang Yue Zhang Dan Wang Ming Yao Yi-Xuan Wang Xing-Ping Zhou Hai-Yan Peng Xiao-Lin Xie Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan430074China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan430074China National Anti-counterfeit Engineering Research Center Huazhong University of Science and TechnologyWuhan430074China

Holographic optical elements(HOEs)based on polymer composites have become a research hot spot in recent years for augmented reality(AR)due to the significant improvement of optical performance,dynamic range,ease of processing and high yield ***,it remains a formidable challenge to obtain a large field of view(FOV)and brightness due to the limited refractive index ***,we report an effective method to tackle the challenge by doping an epoxy liquid crystal termed E6M,which enables a large refractive index modulation of 0.050@633 nm and low haze of 5.0%at a doping concentration of 5 wt%.This achievement may be ascribed to the improved molecular ordering of liquid crystals within the holographic polymer *** high refractive index modulation can endow transmission-type holographic polymer composites with a high diffraction efficiency of 96.2%at a small thickness of 5μm,which would promise the design of thin and lightweight AR devices.

关键词： Polymer nanocomposites Holography AR/VR Refractive index modulation Liquid crystal

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Stable operation of polymer electrolyte-solid-state batteries via lonepair electron fillers

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Nano Research 2023年第11期16卷 12727-12737页

作者： Hongbin Liu Qing Sun Jun Cheng Hongqiang Zhang Xiao Xu Yuanyuan Li Zhen Zeng Yue Zhao Deping Li Jingyu Lu Lijie Ci State Key Laboratory of Advanced Welding and Joining School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Science Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Research Center for Carbon Nanomaterials Key Laboratory for Liquid–Solid Structural Evolution&Processing of Materials(Ministry of Education)School of Materials Science and EngineeringShandong UniversityJinan 250061China College of Materials and Chemistry China Jiliang UniversityHangzhou 310018China

Due to the increasing demand and wide applications of lithium-ion batteries,higher requirements have been placed on the energy density and *** solid-state electrolytes have gained significant popularity due to their excellent interface compatibility and ***,their applications have been greatly restricted by the high crystallinity at room temperature,which hinders the transport of lithium ***,we utilize inorganic tubular fillers with abundant lone-pair atoms to reduce the crystallinity of the polyethylene oxide(PEO)solid-state electrolyte membrane and improve its ionic conductivity at room temperature,enabling stable operation of the *** tubular lone-pair-rich inorganic fillers play a key role in providing avenues for both internal and external charge *** surface lone-pair electrons facilitate the dissociation and transport of lithium ions,while the internally tubular electron-rich layer attracts ions into the cavities,further enhancing the ion *** 100 cycles at room temperature,the lithium battery loaded with this solid-state electrolyte membrane delivers a specific capacity of 141.6 mAh·g−1,which is 51.3%higher compared to the membrane without the fillers.

关键词： nanotube filler polymer electrolyte ion transport room temperature(RT)operation

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Tailoring the morphology and charge transfer pathways of ultrathin Cd_(0.8)Zn_(0.2)S nanosheets via ionic liquid-modified Ti_(3)C_(2)MXenes towards remarkable photocatalytic hydrogen evolution

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Journal of materials Science & technology 2025年第1期204卷 47-59页

作者： Qianqian Hu Haiyan Yin Yifan Liu Abdusalam Ablez Zhuangzhuang Wang Yue Zhan Chengfeng Du Xiaoying Huang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry Fuzhou UniversityFuzhou 350116China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China University of the Chinese Academy of Sciences Beijing 100039China

Small-sized Cd_(x) Zn_(1-x) S solid solution nanomaterial is an important candidate for efficient photocatalytic hydrogen evolution(PHE),but it still suffers from easy agglomeration,severe photo corrosion,and fast photogenerated electron-hole *** tackle these issues,herein,we propose a new strategy to modify Cd_(x) Zn_(1-x) S nanoreactors by the simultaneous utilization of ionic-liquid-assisted morphology engineering and MXene-incorporating *** is,we designed and synthesized a novel hierarchi-cal Cd_(0.8) Zn_(0.2) S/Ti_(3) C_(2) Schottky junction composite through the in-situ deposition of ultrathin Cd_(0.8) Zn_(0.2) S nanosheets on unique IL-modified Ti_(3) C_(2) MXenes by a one-pot solvothermal method for efficiently *** unique construction strategy tailors the thickness of ultrathin Cd_(0.8) Zn_(0.2) S nanosheets and prevents them from stacking and agglomeration,and especially,optimizes their charge transfer pathways during the photocatalytic *** with pristine Cd_(0.8) Zn_(0.2) S nanosheets,Cd_(0.8) Zn_(0.2) S/Ti_(3) C_(2) has abun-dant photogenerated electrons available on the Ti_(3) C_(2) surface for proton reduction reaction,owing to the absence of deep-trapped electrons,suppression of electron-hole recombination in Cd_(0.8) Zn_(0.2) S and high-efficiency charge separation at the Cd_(0.8) Zn_(0.2) S/Ti_(3) C_(2) Schottky junction ***,the hy-drophilicity,electrical conductivity,visible-light absorption capacity,and surficial hydrogen desorption of Cd_(0.8) Zn_(0.2) S/Ti_(3) C_(2) heterostructure are significantly *** a result,the heterostructure exhibits out-standing photocatalytic stability and super high apparent quantum efficiency,being rendered as one of the best noble-metal-free Cd-Zn-S-based *** work illustrates the mechanisms of mor-phology control and heterojunction construction in controlling the catalytic behavior of photocatalysts and highlights the great potential of the IL

关键词： Ionic liquid Ultrathin Cd_(0.8)Zn_(0.2)S nanosheets MXene Schottky junction Photoexcited charge separation Photocatalytic H_(2)evolution

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Generation mechanism and motion behavior of sliver defect in single crystal Ni-based superalloy

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Journal of materials Science & technology 2023年第6期137卷 232-246页

作者： Huxiang Xia Yanhong Yang Qiushui Feng Qingyan Xu Hongbiao Dong Baicheng Liu Key Laboratory for Advanced Materials Processing Technology(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Engineering University of LeicesterLeicesterLE17RHUnited Kingdom

Sliver is a common but easily neglected defect in single crystal Ni-based superalloy *** date,there is still no unified viewpoint on its formation mechanism and generation *** this work,the orientation discontinuity and motion behavior of sliver defects were studied through experiments and numerical *** ultrathin wedge-shaped specimen containing the grain boundary of the sliver and the matrix was prepared at the initial position of the sliver defect for the observation of equal thick-ness *** discontinuity of equal thickness fringes on both sides of the grain boundary was ob-served through a transmission electron microscope,which directly confirms the abrupt change in the orientation between the sliver and matrix from the *** crystal lattices at the smooth area and the bulging area of the grain boundary were found to have unusually different *** irregular lattice arrangement at the bulging area shows that the grain boundary has experienced high-stress *** results of sliver orientation deviation with a further composition analysis show the micro protuberance of the mold shell has a noticeable inductive effect on the sliver ***,a self-developed three-dimensional phase-field simulation model coupled with the spatial topology algorithm is established to simulate the orientation deflection behavior and orientation devia-tion threshold of fractured *** simulation results indicated that there is an upper limit of the cross-section solid fraction at the fracture position for the motion of the fractured *** the cross-section solid fraction at the fracture position is higher than this upper limit,it will be difficult to produce large deviation slivers due to the structural limitation of surrounding *** upper limit does not change with the solidification temperature gradient.

关键词： Single crystal Ni-based superalloys Directional solidification Sliver defect Phase-field simulation

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Fabrication of wear-resistant PA6 composites with superior thermal conductivity and mechanical properties via constructing highly oriented hybrid network of SiC-packed BN platelets

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Journal of materials Science & technology 2023年第15期146卷 200-210页

作者： Jing Chen Jiaming Zhu Yang Pan Hong Wu Shaoyun Guo Jianhui Qiu The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of PlasticRubber Complex Processing TechnologyPolymer Research Institute of Sichuan UniversityChengdu 610065China Jiangsu Industrial Technology Research Institute of Advanced Polymer Materials Nanjing 211899China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityAkita 015-0055Japan

Herein,a strong extensional and shearing field was introduced to construct highly oriented hybrid networks of silicon carbide(SiC)-packed boron nitride(BN)platelets to fabricate high-performance wearresistant PA6 *** show that in-plane and through-plane thermal conductivity(TC)of the prepared PA6 composites with a total filler loading of 20 wt.%reached 1.31 and 0.35 W/(m K),352%and 25%higher than those of pure PA6,*** is attributed to the highly oriented hybrid network that facilitates the formation of efficient thermal conductivity *** monitoring results during friction confirm that high TC favors the friction heat dissipation ***,the yield strength of PA6 composites increased by 39.1%and they still have excellent ductility with an elongation at break of 207.1%.Finally,the wear rate of PA6 composites decreased sharply by 92.5%.This method can be used to manufacture advanced linear bearing and guideway parts,etc。

关键词： Polymer-matrix composites(PMCs) Hybrid Wear Thermal properties

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High-temperature ultra-strength of dual-phase Re_(0.5)MoNbW(TaC)_(0.5) high-entropy alloy matrix composite

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Journal of materials Science & technology 2021年第25期84卷 1-9页

作者： Qinqin Wei Guoqiang Luo RongTu Jian Zhang Qiang Shen Yujie Cui Yunwei Gui Akihiko Chiba State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Institute for Materials Research Tohoku UniversitySendai980-8577Japan

The dual-phase Re_(0.5)MoNbW(TaC)_(0.5) composite,consisting of refractory body-centered cubic(BCC)highentropy alloy and carbide with many fine eutectic structures,was successfully synthesized by arc *** phase stability,high-temperature mechanical properties and strengthening mechanism of the ascast composite were *** microstructure of the composite remained stable after annealing at 1300℃for 168 *** exhibited remarkably high-temperature strength,yield strength~901 MPa,and true ultimate compressive strength~1186 MPa at 1200℃.The BCC phase and carbide exhibited a semi-coherent interface with good bonding after severe deformation at 1200℃.The dipolar dislocation walls in BCC phase,restricted dynamic interaction between defects in carbide,and the pinning effect of semi-coherent interface offered effective strengthening effects.

关键词： High-entropy alloy Composite Eutectic structure Strength Strengthening mechanism

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Thermoelectric Properties of an Individual Suspended Single-Crystalline Sb_(2)Se_(3)Nanowire

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Journal of Thermal Science 2022年第4期31卷 1106-1114页

作者： DU Yanzheng SHI Shaoyi MIAO Tingting MA Weigang MAI Liqiang ZHANG Xing Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China Beijing Key Laboratory of Process Fluid Filtration and Separation College of Mechanical and Transportation EngineeringChina University of PetroleumBeijing 102249China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Nanowires exhibit excellent thermoelectric performance,due to the stronger quantum confinement and phonon scattering effect compared to bulk ***,it is a challenge to accurately evaluate the thermoelectric performance of *** this paper,the thermoelectric properties of an individual suspended Sb_(2)Se_(3) nanowire have been characterized by comprehensive T-type method,including thermal conductivity,electrical conductivity,Seebeck coefficient and figure of *** thermal conductivity increases from 0.57 W/(m·K)to 3.69 W/(m·K)with temperature increasing from 80 K to 320 *** lattice vibration dominates the heat conduction process,and due to its flawless crystal structure,the thermal conductivity is not lower than the reported values of bulk Sb_(2)Se_(3).The electrical conductivity increases from 7.83 S/m to 688 S/m in the temperature range of 50 K–320 K,which is a great improvement compared with the corresponding bulk *** 294 K,the Seebeck coefficient of the Sb_(2)Se_(3) nanowire is–1120μV/K and the corresponding figure of merit is 0.064.

关键词： Sb_(2)Se_(3)nanowire thermoelectric properties thermal conductivity Seebeck coefficient electrical conductivity

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