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Flexible double-wall carbon foam/Cu-Co oxides based symmetric supercapacitor with ultrahigh energy density

Journal of Materials Science & Technology 2023年第29期160卷 109-117页

作者： Ruimei Yuan Xuemin Yin Shengyue Gu jingjing chang Hejun Li Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi’an 710071China Carbon/Carbon Composites Research Center Northwestern Polytechnical UniversityXi’an 710072China School of Science XI’AN University of Posts&TelecommunicationsXi’an 710121China

Electrochemical supercapacitors are regarded as a promising electrochemical energy storage device,because of its fast chargeability,long cycle life,and high power *** connection of porous carbon and extensive electroactive substances have significantly improved their ***,the unsuitable constructing strategy and unclear electrochemical mechanism lead to a mismatch between the fast double-layer effect and the sluggish Faradaic behavior at the electrode,degrading the energy density and capacitance ***,the construction strategy based on the double-wall carbon foam,carbon nanotubes and copper nanocubes provides enhanced electronic structure and ion transport path,resulting in accelerated proton transport and redox insertion/deinsertion processes,as well as surprising electrochemical behaviors of Cu-Co oxide on both positive and negative electrodes(927.9 and 427.0 F g^(−1)at 1 A g^(−1)).A flexible symmetric supercapacitor assembled with the SCF/CNT@Cu/Cu-Co-O delivers a extremely excellent *** 1 A g^(−1),the specific capacitance is 337.8 F g^(−1),the energy density hits 60 Wh kg^(−1)at the power density of 17.8 kW kg^(−1).At 10 A g^(−1),the energy density is up to 120.1 Wh kg^(−1),representing the top energy density of *** systematical structural optimization and mechanism study,this work broadens the fabricating strategy of hierarchical nanostructures and high-performance electrode materials for energy storage.

关键词： Carbon foam Cu-Co oxides Symmetric supercapacitors Energy density

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Flexible Nanocomposite Conductors for Electromagnetic Interference Shielding

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Nano-Micro Letters 2023年第10期15卷 210-259页

作者： Ze Nan Wei Wei Zhenhua Lin jingjing chang Yue Hao State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian University2 South Taibai RoadXi’an 710071People’s Republic of China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian University2 South Taibai RoadXi’an 710071People’s Republic of China

With the extensive use of electronic communication technology in integrated circuit systems and wearable devices, electromagnetic interference(EMI) has increased dramatically. The shortcomings of conventional rigid EMI shielding materials include high brittleness, poor comfort, and unsuitability for conforming and deformable applications. Hitherto, flexible(particularly elastic) nanocomposites have attracted enormous interest due to their excellent deformability. However, the current flexible shielding nanocomposites present low mechanical stability and resilience, relatively poor EMI shielding performance, and limited multifunctionality. Herein, the advances in low-dimensional EMI shielding nanomaterials-based elastomers are outlined and a selection of the most remarkable examples is discussed. And the corresponding modification strategies and deformability performance are summarized. Finally, expectations for this quickly increasing sector are discussed, as well as future challenges.

关键词： Electromagnetic interference shielding Intrinsically stretchable nanocomposites Compressible monolith Low-dimensional materials Flexible devices

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Recent advances of carbon nanotubes in perovskite solar cells

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SusMat 2023年第5期3卷 639-670页

作者： Xian-Gang Hu Zhenhua Lin Liming Ding jingjing chang Advanced Interdisciplinary Research Center for Flexible Electronics Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’anChina State Key Discipline Laboratory ofWide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi’anChina Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijingChina

Perovskite solar cells(PSCs)have exhibited tremendous potential in photovoltaic fields owing to their appreciable performance and simple ***,device performances are still required to be further improved before commercial *** one-dimensional materials,carbon nanotubes(CNTs)have been utilized to regulate stability and efficiency of PSCs because of their excellent chemical stability,flexibility,as well as tunable optical and electrical *** this review,we comprehensively summarize various functions of CNTs in PSCs,such as transparent electrodes,hole/electron-transport layers,counter electrodes,perovskite additives,and ***,applications of CNTs toward the advancement of flexible and semitransparent PSCs are ***,we preview the challenges and research interests of using CNTs in high-efficiency and stable perovskite devices.

关键词： carbon nanotubes flexible solar cells long-term stability perovskite solar cells semitransparent solar cells

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Recent Progress of Electrode Materials for Flexible Perovskite Solar Cells

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Nano-Micro Letters 2022年第7期14卷 179-208页

作者： Yumeng Xu Zhenhua Lin Wei Wei Yue Hao Shengzhong Liu Jianyong Ouyang jingjing chang State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian University2 South Taibai RoadXi’an 710071People’s Republic of China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian University2 South Taibai RoadXi’an 710071People’s Republic of China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119People’s Republic of China Department of Materials Science and Engineering National University of Singapore7 Engineering Drive 1Singapore 117574Singapore

Flexible perovskite solar cells(FPSCs) have attracted enormous interest in wearable and portable electronics due to their high power-per-weight and low cost. Flexible and efficient perovskite solar cells require the development of flexible electrodes compatible with the optoelectronic properties of perovskite. In this review, the recent progress of flexible electrodes used in FPSCs is comprehensively reviewed. The major features of flexible transparent electrodes, including transparent conductive oxides, conductive polymer, carbon nanomaterials and nanostructured metallic materials are systematically compared. And the corresponding modification strategies and device performance are summarized. Moreover, flexible opaque electrodes including metal films, opaque carbon materials and metal foils are critically assessed. Finally, the development directions and difficulties of flexible electrodes are given.

关键词： Flexible electrode Flexible perovskite solar cell Carbon nanomaterials Metallic nanostructures Conductive oxide

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Defects and doping engineering towards high performance lead-free or lead-less perovskite solar cells

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Journal of Energy Chemistry 2022年第5期31卷 420-438页

作者： Wenying Cao Zhaosheng Hu Zhenhua Lin Xing Guo Jie Su jingjing chang Yue Hao State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian UniversityXi’an 710071ShaanxiChina Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi’an 710071ShaanxiChina

Up to now, perovskite solar cells(PSCs) have reached a certified 25.5% efficiency. As a promising photo-electric material, the metal halide perovskite possesses many outstanding properties such as tunable bandgap, long diffusion length, high absorption coefficient and carrier mobility. In spite of these remarkable properties, defects are inevitable during the solution processing. Therefore, many efforts have been made to reduce defects in perovskite films and thus improve the performance of devices. Among them,substitution or doping engineering is one of the most studied methods. Meanwhile, due to the poor stability of the organic-inorganic hybrid perovskite and the toxicity of Pb-based perovskite materials, all inorganic perovskite and lead-less or lead-free perovskite have emerged as promising materials. Here,we focus on the defect engineering especially substitutions on different sites in an ABX_(3) structure. The particular attention is devoted towards lead-less or lead-free perovskites, and we discuss several common elements or groups used to partially replace Pb^(2+). It is noted that proper elemental doping at different sites is an important guarantee for obtaining high-performance lead-less or lead-free PSCs.

关键词： Perovskite Defects Doping engineering Lead-free Lead-less Solar cells

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Optimizing the Performance of CsPbI3?Based Perovskite Solar Cells via Doping a ZnO Electron Transport Layer Coupled with Interface Engineering

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Nano-Micro Letters 2019年第04期11卷 605-618页

作者： Man Yue Jie Su Peng Zhao Zhenhua Lin Jincheng Zhang jingjing chang Yue Hao State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of Graphene School of Microelectronics Xidian University

Interface engineering has been regarded as an e ective and noninvasive means to optimize the performance of perovskite solar cells（PSCs）. Here, doping engineering of a ZnO electron transport layer（ETL） and CsPbI3/ZnO interface engineering via introduction of an interfacial layer are employed to improve the performances of CsPbI3-based PSCs. The results show that when introducing a TiO2bu er layer while increasing the ZnO layer doping concentration, the open-circuit voltage, power conversion e ciency, and fill factor of the CsPbI3-based PSCs can be improved to 1.31 V, 21.06%, and 74.07%, respectively, which are superior to those of PSCs only modified by the TiO2bu er layer or high-concentration doping of ZnO layer. On the one hand, the bu er layer relieves the band bending and structural disorder of CsPbI3. On the other hand, the increased doping concentration of the ZnO layer improves the conductivity of the TiO2/ZnO bilayer ETL because of the strong interaction between the TiO2and ZnO layers. However, such phenomena are not observed for those of a PCBM/ZnO bilayer ETL because of the weak interlayer interaction of the PCBM/ZnO interface. These results provide a comprehensive understanding of the CsPbI3/ZnO interface and suggest a guideline to design high-performance PSCs.

关键词： All-inorganic CsPbI3 perovskites Interface engineering Doping ZnO Simulation

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Cs_(2)TiI_(6):A potential lead-free all-inorganic perovskite material for ultrahigh-performance photovoltaic cells and alpha-particle detection

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Nano Research 2022年第3期15卷 2697-2705页

作者： Peng Zhao Jie Su Yujia Guo Lu Wang Zhenhua Lin Yue Hao Xiaoping Ouyang jingjing chang State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of GrapheneSchool of MicroelectronicsXidian University2 South Taibai RoadXi’an 710071China Shaanxi Engineering Research Center of Controllable Neutron Source School of ScienceXijing UniversityXi’an 710123China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an 710024China

The lead contamination and long-term stability are the two important problems limiting the commercialization of organic–inorganic lead halide *** this study,through an innovative multi-scale simulation strategy based on the first-principle calculations coupling with drift-diffusion model and Monte Carlo method,a new discovery is shed on the vacancy-ordered double perovskite Cs_(2)TiI_(6),a potential nontoxic and stable perovskite material for high-performance solar cell andα-particle *** excellent photon absorption character and ultrahigh carrier mobility(μn=2.26×10^(4)cm^(2)/Vs,μp=7.38×10^(3)cm^(2)/Vs)of Cs_(2)TiI_(6)induce ultrahigh power conversion efficiency(PCE)for both single-junction solar cell(22.70%)and monolithic all-perovskite tandem solar cell(26.87%).Moreover,the outstanding device performance can be remained even in high energy charge particle detection(α-particle)with excellent charge collection efficiency(CCE=99.2%)and mobility-lifetime product(μτh=1×10^(–3)cm^(2)/V).Furthermore,to our surprise,the solar cell andα-particle detector based on Cs_(2)TiI_(6)material are able to withstand ultrahigh fluence proton beam up to 1013 and 1015 p/cm2 respectively,which strongly suggests that semiconductor devices based on Cs_(2)TiI_(6)material are able to apply in the *** multi-scale simulation connecting from material to device reveals that Cs_(2)TiI_(6)perovskite has the great potential for photovoltaic cells,α-particle detection and even their space application.

关键词： Cs_(2)TiI_(6) first-principle theory drift-diffusion model Monte Carlo method alpha-particle detection

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Effect of drying methods on perovskite films and solar cells

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Journal of Semiconductors 2024年第1期45卷 1-5页

作者： Ling Liu Chuantian Zuo Guang-Xing Liang Hua Dong jingjing chang Liming Ding Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DeviceIsnstitute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Electronic and Information Engineering Xi’an Jiaotong UniversityXi’an 710049China Academy of Advanced Interdisciplinary Research Xidian UniversityXi’an 710126China

The high efficiency,solution processibility,and flexibility of perovskite solar cells make them promising candidates for the photovoltaic industry[1−8].The deposition method is one of the most critical factors that affect the performance of perovskite *** deposition methods have been developed to make perovskite films,including spin-coating,slotdie coating.

关键词： perovskite films critical

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Synergistic Interface Layer Optimization and Surface Passivation with Fluorocarbon Molecules toward Efficient and Stable Inverted Planar Perovskite Solar Cells

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Research 2021年第1期2021卷 1225-1235页

作者： Long Zhou Jie Su Zhenhua Lin Xing Guo Jing Ma Tao Li Jincheng Zhang jingjing chang Yue Hao State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of GrapheneSchool of MicroelectronicsXidian University2 South Taibai RoadXi’an 710071China Centre for Spintronics and Quantum System State Key Laboratory for Mechanical Behavior of MaterialsSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’anShaanxi 710049China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian University2 South Taibai RoadXi’an 710071China

Large-size organic halide passivation has been considered an efficient approach to enhance the perovskite solar cell(PSC)efficiency and ***,a facile posttreatment strategy was demonstrated,wherein trifluoromethyl-phenethylamine hydrobromide(CF_(3)-PEABr)is firstly used to passivate the perovskite film *** CF_(3)-PEABr surface posttreatment could coordinate with halide dangling bonds that exist at the perovskite crystal ***,the surface treatment with CF_(3)-PEABr could efficiently passivate the defects in the perovskite film and suppress the nonradiative carrier *** a result,a high efficiency of 21.3%is obtained,and an increment of 80 mV in V_(oc)(a large V_(oc)of 1.15 V,with a 0.42 V voltage deficit)occurs,compared to the control *** relieve the hydrophobic nature properties of the-CF_(3)functional group and the dewetting problem of PCBM layer deposition,a surfactant Triton X-100 is used to modify the PCBM ***,the devices with CF_(3)-PEABr posttreatment exhibit better operational,thermal(85℃),and long storage stabilities without any encapsulation.

关键词： surface stability perovskite

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Recent advances in resistive random access memory based on lead halide perovskite

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InfoMat 2021年第3期3卷 293-315页

作者： Jiayu Di Jianhui Du Zhenhua Lin Shengzhong(Frank)Liu Jianyong Ouyang jingjing chang State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of GrapheneSchool of MicroelectronicsXidian UniversityXi'anChina Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi'anChina Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologyInstitute for Advanced Energy MaterialsSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'anChina Department of Materials Science and Engineering National University of SingaporeSingaporeSingapore

Lead halide perovskites have attracted increasing attention in photovoltaic devices,light-emitting diodes,photodetectors,and other fields due to their excellent *** optoelectronic devices,growing numbers of studies have focused on the perovskite-based electrical devices in the past few years,such as transistors and resistive random access memories(RRAMs).Here,this article summarizes the recent progress the researchers have made of RRAM ***,the working mechanism and the key parameters of RRAM are ***,the working principles,including the conductive filament model(containing the types of the model of the metal cationsinduced filament and the model of the ions migration in bulk),the interface effect,and the electronic effect are the origins of the RRAM behaviors,and hence,various factors that affect the device performance are ***,RRAMs based on organolead halide perovskite and all-inorganic perovskite are discussed in terms of different structures,different compositions,and different fabrication ***,a brief conclusion and a broad outlook are given on the progress and challenges in the field of perovskite-based RRAMs.

关键词： all-inorganic perovskites conductive filament models organolead halide perovskites resistive random access memories resistive switching

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