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Chelation strategy induced blue-shift for efficient deep-blue perovskite light-emitting diodes

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Science Bulletin 2024年第15期69卷 2332-2336页

作者： Yu Xia Zhipeng Zhang Yu-Hang Zhou Yu-Han Li Bin wang Kai-Li wang Chun-Hao Chen Jing Chen Ilhan Yavuz Guichuan Xing zhao-kui wang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory of Advanced Negative Carbon TechnologiesJiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao 999078China Department of Physics Marmara UniversityZiverbeyIstanbul 34722Turkey

Metal halide perovskite, regarded as a potential material for next-generation display and lighting applications, has attracted great attention [1,2]. The development of blue perovskite light-emitting diodes (Pe LEDs) ... 详细信息

关键词： diodes emitting perovskite

Highly conductive dodecaborate/MXene composites for high performance supercapacitors

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Nano Research 2020年第1期13卷 196-202页

作者： Zhenxing Li Chang Ma Yangyang Wen Zhiting Wei Xiaofei Xing Junmei Chu Chengcheng Yu Kaili wang zhao-kui wang Key Laboratory of Heavy Oil Processing Institute of New EnergyChina University of Petroleum(Beijing)Beijing102249China Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou215123China

With the increasingly prominent energy and environmental issues,the supercapacitors,as a highly efficient and clean energy conversion and storage devices,meet the requirements ***,it is still a challenge to enhance the capacitance and energy density of supercapacitors.A novel and highly conductive dodecaborate/MXene composites have been designed for high performance *** surface charge property of MXene was modified by a simple ultrasonic treatment with ammonium ion,and the dodecaborate ion can be inserted into the inner surface of MXene by electrostatic *** to the unique icosahedral cage conjugate structure formed by the B-B bond and the highly delocalized three-dimensionalπbond structure of the electrons,the negative charge is delocalied on the whole dodecaborate ion,which reduces the ability to bind to ***,the cations can move easily,and the dodecaborate can act as a“lubricant”for ion diffusion between the MXene layers,which significantly improves the ion transfer rate of *** dodecaborate/MXene composites can achieve an extremely high specific capacitance of 366 F.g^-1 at a scan rate of 2 mV.s^-1,which is more than eight times higher than that of MXene(43 F1-)at the same scan *** finding provides a novel route on the fabrication of the high performance supercapacitors.

关键词： dodecaborate MXene supercapacitors electrostatic adsorption

Indium doped CsPbI3 films for inorganic perovskite solar cells with efficiency exceeding 17%

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Nano Research 2020年第8期13卷 2203-2208页

作者： Xiaomei Li Kaili wang Femi Lgbari Chong Dong Wenfan Yang Chang Ma Heng Ma zhao-kui wang Liang-Sheng Liao Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou215123China Henan Province Key Laboratory of Photovoltaic Materials College of Physics&Materials ScienceHenan Normal UniversityXinxiang453007China

In recent years,all-inorganic perovskite materials have set off a research boom owing to features,such as good thermal stability,suitable bandgap,and fascinating optical ***,the power conversion efficiency(PCE)and the ambient stability of all-inorganic perovskite solar cells still remain a ***,we investigate the effect of the addition of InI3 into CsPbI3 film on the corresponding ***3 incorporation could retard the crystallization process and control the growth rate of CsPbI3 polycrystalline films,yielding a high quality film with large grains and few *** increment in electrostatic potential and the reduction of carrier recombination enabled the open-circuit voltage of fabricated perovskite solar cell to be increased from 0.89 to 0.99 *** champion device delivered a power conversion efficiency of 17.09%,which is higher than 14.36%for the reference *** the InI3-included solar cell without any encapsulation retained 77%of its original efficiency after 860 h aging at room temperature in N2 condition.

关键词： indium doping CsPbI3 crystallization retardation stability

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π-π堆叠构建钙钛矿光伏高效电荷通道

Science Bulletin 2024年第1期69卷 26-29页

作者：陈春浩胡凡王凯礼陈静滕天禹史怡然夏宇苏圳煌高兴宇 Ilhan Yavuz 王照奎廖良生 Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory of Advanced Negative Carbon TechnologiesJiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteShanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Department of Physics Marmara UniversityIstanbul 34722Turkey

Perovskite solar cells(PSCs)have emerged as strong potential candidates for future photovoltaic *** power conversion efficiency(PCE)of PSCs has already surpassed 26%,approaching their theoretical limit[1].The commonly used device structure for PSCs is ITO/SnO_(2)/perovskite/2,2',7,7'-tetrakis-(N,N-di-4-methox yphenylamino)-9,9'-spirobifluorene(spiro-OMeTAD)/Au[2].

关键词：钙钛矿 approaching perovskite

Ultra-small hollow ternary alloy nanoparticles for efficient hydrogen evolution reaction

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National Science Review 2021年第7期8卷 185-197页

作者： Zhenxing Li Chengcheng Yu Yikun Kang Xin Zhang Yangyang Wen zhao-kui wang Chang Ma Cong wang Kaiwen wang Xianlin Qu Miao He Ya-Wen Zhang Weiyu Song State Key Laboratory of Heavy Oil Processing College of New Energy and Materials Beijing Key Laboratory of Biogas Upgrading Utilization China University of Petroleum (Beijing) College of Science China University of Petroleum (Beijing) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Institute of Functional Nano and Soft Materials (FUNSOM) Soochow University Beijing Key Laboratory and Institute of Microstructure and Property of Advanced Materials Beijing University of Technology Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications PKU–HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry College of Chemistry and Molecular Engineering Peking University

Hollow nanoparticles with large specific surface area and high atom utilization are promising catalysts for the hydrogen evolution reaction(HER). We describe herein the design and synthesis of a series of ultra-small hollow ternary alloy nanostructures using a simple one-pot strategy. The same technique was demonstrated for hollow PtNiCu nanoparticles, hollow PtCoCu nanoparticles and hollow CuNiCo nanoparticles. During synthesis, the displacement reaction and oxidative etching played important roles in the formation of hollow structures. Moreover, our hollow PtNiCu and PtCoCu nanoparticles were single crystalline, with an average diameter of 5 nm. Impressively, ultra-small hollow PtNiCu nanoparticles,containing only 10% Pt, exhibited greater electrocatalytic HER activity and stability than a commercial Pt/C catalyst. The overpotential of hollow Pt Ni Cu nanoparticles at 10 mA cm-2was 28 mV versus reversible hydrogen electrode(RHE). The mass activity was 4.54 A mg Pt-1at-70 mV versus RHE, which is 5.62-fold greater than that of a commercial Pt/C system(0.81 A mg Pt-1). Through analyses of bonding and antibonding orbital filling, density functional theory calculations demonstrated that the bonding strength of different metals to the hydrogen intermediate(H*) was in the order of Pt > Co > Ni > Cu. The excellent HER performance of our hollow PtNiCu nanoparticles derives from moderately synergistic interactions between the three metals and H*. This work demonstrates a new strategy for the design of low-cost and high-activity HER catalysts.

关键词： ultra-small hollow nanostructure hydrogen evolution reaction density functional theory

Formation of ZnSe magic-size clusters displaying optical absorption doublets from prenucleation clusters

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Nano Research 2024年第7期17卷 6741-6748页

作者： Dingyu zhao Shasha wang Jiawei Xue Chunchun Zhang Shanling wang Xiaoqin Chen Chaoran Luan kui Yu Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China Engineering Research Center in Biomaterials Sichuan UniversityChengdu 610065China Analytical&Testing Center Sichuan UniversityChengdu 610065China College of Biomedical Engineering Sichuan UniversityChengdu 610065China

The formation pathway of colloidal semiconductor ZnSe magic-size clusters(MSCs)in a reaction that display an optical absorption doublet remains poorly *** reaction of Zn(OAc)_(2)/OLA(made from zinc acetate and oleylamine)and tri-noctylphosphine selenide(SeTOP)in OLA in the presence of diphenylphosphine(HPPh_(2))is studied,in which dMSC-345 displays a doublet peaking at 328/345 *** suggest that the development is from the clusters that form in the initial prenucleation stage of the *** clusters are the precursor compound(PC-299)of MSC-299(displaying an absorption singlet peaking at 299 nm).PC-299 transforms to PC-345 at a later *** presence of alcohol(such as methanol or ethylene glycol)promotes another pathway,which is the PC-299 to PC-320 ***-320 transforms to dMSC-320(with a doublet at 305/320 nm),followed by dMSC-345 via *** present study provides additional evidence that clusters(PC-299)form and transform(such as to dMSC-345 via PC-345)in the prenucleation stage of ZnSe quantum dots(QDs).

关键词： magic-size cluster(MSC) prenucleation cluster precursor compound(PC) quantum dot(QD) zinc selenide(ZnSe)

Long-wave infrared emission properties of strain-balanced InAs/In_(x)Ga_(1-x)As_(y)Sb_(1-y)type-Ⅱsuperlattice on different substrates

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Rare Metals 2024年第7期43卷 3194-3204页

作者： Chao Shi Xuan Fang Hong-Bin zhao Deng-kui wang Xi Chen Dan Fang Dong-Bo wang Xiao-Hua wang Jin-Hua Li State Key Laboratory of High Power Semiconductor Lasers School of PhysicsChangchun University of Science and TechnologyChangchun 130022China State Key Laboratory of Advanced Materials for Smart Sensing China General Research Institute for Nonferrous MetalsBeijing 100088China Department of Opto-Electronic Information Science School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China

High-performance type-Ⅱsuperlattices ofⅢ-Ⅴsemiconductor materials play an important role in the development and application of infrared optoelectronic *** the quality of epitaxial materials and clarifying the luminescent mechanism are of great significance for practic al applic *** this work,strain-balanced and high-quality In As/In_(x)Ga_(1-x)As_(y)Sb_(1-y)superlattices without lattice mismatch were achieved on InAs and GaSb substrates *** grown on In As substrate could exhibit higher crystal quality and surface flatness based on high-resolution X-ray diffraction(HRXRD)and atomic force microscopy(AFM)measurements'***,the strain distribution phenomenon from geometric phase analysis indicates that fluctuations of alloy compositions in superlattices on GaSb substrate are more *** addition,the optical properties of superlattices grown on different substrates are discussed *** of the difference in fluctuations of element composition and interface roughness of superlattices on different substrates,the superlattices grown on In As substrate would have higher integral intensity and narrower full-width at half maximum of long-wave infrared ***,the thermal quenching of emission intensity indicates that the superlattices grown on the In As substrate have better recombination ability,which is beneficial for increasing the operating temperature of infrared optoelectronic devices based on this type of superlattices.

关键词： Photoluminescence Alloy compositions fluctuations InAs(Sb)/In_(x)Ga_(1-x)As_(y)Sb_(1-y) Type-Ⅱsuperlattice Substrate

Effect of the Filling Liquid Ratio on the Thermal Performance of a Novel Thermal Diode with Wick

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Journal of Thermal Science 2024年第2期33卷 396-407页

作者： LI Zhiyong MING Tingzhen ZHANG Heyu zhao Sitong wang Qinggang CAI Cunjin YIN kui FANG Yueping WU Yongjia School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan430070China Sanya Science and Education Innovation Park Wuhan University of TechnologySanya572004China Deparment of Four Station Logistics AcademyXuzhou221000China School of Energy Construction and EnvironmentCoventry UniversityPriory StreetCoventryCV15FBUK

The application of thermal diodes,which allow heat to flow more readily in one direction than the other,is an important way to reduce energy consumption in buildings and enhance the battery heat dissipation of electric *** on various factors including the specific design,materials used,and operating conditions,the convective thermal diode can exhibit the best thermal rectification effect in intended applications compared to the other thermal *** this study,a novel convective thermal diode with a wick was proposed based on the phase change heat transfer *** design takes advantage of both capillary forces provided by the wick and gravity to achieve enhanced unidirectional heat transfer performance for the designed convective thermal *** effect of the filling liquid ratio on the thermal performance of the thermal diode was experimentally investigated,which was in good agreement with the theoretical *** research findings showed that with an optimal liquid filling ratio of 140%,the thermal diode with a wick can achieve a better thermal rectification ratio when subjected to a lower heating power,and the maximum thermal rectification ratio of 21.76 was experimentally achieved when the heating power of the thermal diode was 40 W.

关键词： filling liquid ratio thermal diode wick structure gravity

CsPbBrI perovskites with low energy loss for high-performance indoor and outdoor photovoltaics

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Science Bulletin 2021年第4期66卷 347-353,M0004页

作者： Kai-Li wang Xiao-Mei Li Yan-Hui Lou Meng Li zhao-kui wang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China College of Physics Soochow Institute for Energy and Materials InnovationsSoochow UniversitySuzhou 215006China

Over the years,the efficiency of inorganic perovskite solar cells(PSCs)has increased at an unprecedented ***,energy loss in the device has limited a further increase in efficiency and *** this work,we used(NH4)2C2O4·H2O to treat CsPbBrI2 perovskite film during *** CsPbBrI2 underwent secondary crystallization to form high quality films with micrometer-scale and low trap density.(NH4)2C2O4·H2O treatment promoted charge transfer capacity and reduced the ideal *** also dropped the energy loss from 0.80 to 0.64 *** resulting device delivered a power conversion efficiency(PCE)of 16.55%with an open-circuit voltage(Voc)of 1.24 V,which are largely improved compared with the reference device which exhibited a PCE of 13.27%and a Voc of 1.10 *** addition,the optimized treated device presented a record indoor PCE of 28.48%under a fluorescent lamp of 1000 lux,better than that of the reference device(19.05%).

关键词： Perovskite solar cells Energy loss Indoor light Carrier dynamics Grain size