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Employ ionic liquid to stabilize black-phase formamidinium perovskites

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Science China Chemistry 2021年第8期64卷 1263-1264页

作者： Saisai Li mingjian yuan Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin300071China

The certified power conversion efficiency(PCE)of per-ovskite solar cells which have emerged as the most promising candidates for next-generation thin-film photovoltaics has exceeded 25%.Among all available compositions,formamidinium lead iodide perovskite(FAPbI_(3))has a theoretically higher efficiency than the other perovskite analogues due to its narrower bandgap[1,2]and hence has attracted widespread attention.

关键词： perovskite hence narrow

Methylammonium-and bromide-free perovskites enable efficient and stable photovoltaics

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Journal of Energy Chemistry 2021年第12期30卷 12-24,I0002页

作者： Saisai Li Tingwei He yuanzhi Jiang mingjian yuan Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China

Hybrid perovskite solar cell(PSC)has attracted extensive research interest due to its rapid increase in efficiency,regarding as one of the most promising candidates for the next-generation photovoltaic *** certified power conversion efficiency of the devices based on formamidinium lead iodide(FAPbI_(3))perovskite has reached 25.5%,approaching the record of monocrystalline silicon solar ***,the blackα-phase FAPbI_(3)materials can spontaneously transform to non-optically activeδ-phase at room temperature,which greatly hinder their photovoltaic *** order to overcome this problem,various strategies,especially introducing methylammonium(MA^(+)),caesium(Cs^(+))and bromide(Br^(-))ions into the materials,have been widely ***,MA^(+)can largely reduce the thermal stability of the ***,the introduction of Br^(-)can enlarge the materials'bandgap,resulting in a reduced theoretical *** these in mind,developing the strategies which without using MA^(+)and Br^(-)is the inevitable ***,we focus on the recent progresses of stabilizingαFAPbI_(3)without employing MA^(+)and Br^(-),and discuss the advantages of inorganic ions doping and dimensionality engineering to stabilizedαFAPbI_(3).Meanwhile,in order to deeply understand the relationship between the semiconducting properties and device performance of the corresponding materials,we then summarize several significant strategies to suppress the non-radiation recombination,such as interface modification and trap ***,we propose to develop more effective'A-site'alternatives to stabilizeαFAPbI_(3),which is expected to achieve high-efficient PSCs with long-term stability,facilitating its commercialization process.

关键词： Perovskites Solar cells Stability α-FAPbI_(3) Dimensionality engineering

Two-dimensional perovskite capping layer for stable and efficient tin-lead perovskite solar cells

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Science China Chemistry 2019年第5期62卷 629-636页

作者： Jin yuan yuanzhi Jiang Tingwei He Guodong Shi Zixiong Fan mingjian yuan Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) College of ChemistryNankai University Renewable Energy Conversion and Storage Center Nankai University

Mixed tin-lead iodide perovskites exhibit the characteristics of low toxicity and improved light harvesting ability up to nearinfrared(NIR) spectral region, making them as an attractive alternative for traditional lead based perovskites. However, the performance of lead-based perovskites solar cells is still far inferior to their lead analogues owing to the unavoidable oxidation of Sn^(2+)to Sn^(4+). Here we introduced two-dimensional(2D) perovskite on the top of three dimensional(3D) perovskite film as a capping layer to reduce the self-oxidation, and thus improved the device stability. 2D capping layer was then confirmed by X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) analysis. The existence of the 2D protecting thin layer significantly reduce the spontaneous Sn^(2+)oxidation, thus improve the device performance and reduce the hysteresis. The phenomena could be ascribed to the improved charge extraction efficiency causing by prohibited nonradiative recombination. On top of this, the photovoltaic devices based on conventional-structure configuration were fabricated. Taking advantage of the 2D capping layer, 2D/3D hybrid perovskite photovoltaic devices achieve a open-circuit voltage(Voc) of 0.77 V with short circuit current density(Jsc) of 26.60 mA cm^(-2), delivering the best-performing power conversion efficiency of 15.5%. Moreover, the 2D/3D perovskite devices maintained 60% its initial efficiency after 40 h exposed in air(humidity around 30%, temperature 22 °C),while 3D perovskite-based devices completely failed.

关键词： two-dimensional perovskites tin-lead perovskites 2D/3D stability

Chemical sensors based on π-conjugated organic molecules and gold nanoparticles

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Science China Chemistry 2009年第6期52卷 715-730页

作者： yuan mingjian LI YongJun LIU HuiBiao LI YuLiang Beijing National Laboratory for Molecular Science(BNLMS) and CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Graduate University of Chinese Academy of Sciences Beijing 100049China

Scientists have developed techniques for synthesizing and characterizing many new materials including conjugated small molecules, polymers and gold particles protected by conjugated organic chromophores for testing specific sensing properties in the past decade. Still, the design and synthesis or supermolecular systems fabrication of novel materials with controlled sensing properties is a significant and ongoing challenge within nanoscience and nanotechnology. Recently, our group has successfully constructed a series of chemosensors using small organic molecules, conjugated polymers and gold nanoparticles for real-time detection of specific analytes. The chemosensors show high selectivity and sensitivity in the detection of cations and biologic analytes and thus are potentially promising for applications in sensing assay system. In this review, recent sutdies on the design, synthesis and photo-physical properties of novel materials and construct of chemosensors are summarized with an emphasis on the development in our groups in recent years.

关键词： energy transfer charge transfer nanotechnology organic-inorganic hybrid composites.

High-performance quasi-2D perovskite light-emitting diodes: from materials to devices

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Light(Science & Applications) 2021年第4期10卷 516-541页

作者： Li Zhang Changjiu Sun Tingwei He yuanzhi Jiang Junli Wei Yanmin Huang mingjian yuan Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai University300071 TianjinPeople's Republic of China

Quasi-two-dimensional(quasi-2D)perovskites have attracted extraordinary attention due to their superior semiconducting properties and have emerged as one of the most promising materials for next-generation lightemitting diodes(LEDs).The outstanding optical properties originate from their structural *** particular,the inherent quantum-well structure endows them with a large exciton binding energy due to the strong dielectricand quantum-confinement effects;the corresponding energy transfer among different n-value species thus results in high photoluminescence quantum yields(PLQYs),particularly at low excitation *** review herein presents an overview of the inherent properties of quasi-2D perovskite materials,the corresponding energy transfer and spectral tunability methodologies for thin films,as well as their application in high-performance *** then summarize the challenges and potential research directions towards developing high-performance and stable quasi-2D *** review thus provides a systematic and timely summary for the community to deepen the understanding of quasi-2D perovskite materials and resulting LED devices.

关键词： diodes performance quantum

Stabilization of Cu/Ni Alloy Nanoparticles with Graphdiyne Enabling Efficient CO_(2) Reduction

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Chemical Research in Chinese Universities 2021年第6期37卷 1328-1333页

作者： FU Xinliang ZHU Aonan CHEN Xiaojie ZHANG Shifu WANG Mei yuan mingjian Key Laboratory of Advanced Energy Materials Chemistry Ministry of EducationRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin300071P.R.China Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao266100P.R.China

Electrocatalysis has become an attractive strategy for the artificial reduction of CO_(2) to high-value ***,the design and development of highly selective and stable non-noble metal electrocatalysts that convert CO_(2) to CO are still a *** a new type of two-dimensional carbon material,graphdiyne(GDY),is rarely used to explore the application in carbon dioxide reduction reaction(CO_(2)RR).Therefore,we tried to use GDY as a substrate to stabilize the copper-nickel alloy nanoparticles(NPs)to synthesize Cu/Ni@***/Ni@GDY requires an overpotential(−0.61 V)to 10 mA/cm^(2) for the formation of CO,and it shows better activity than Au and Ag,achieving a higher Faraday efficiency of about 95.2%and high stability of about 26 h at an overpotential(−0.70 V).The electronic interaction between GDY substrate and Cu/Ni alloy NPs and the large specific surface area of GDY is responsible for the high performance.

关键词： Graphdiyne(GDY) Carbon dioxide reduction reaction(CO_(2)RR) CO Electrocatalysis Cu/Ni alloy nanoparticle

Tuning coherent phonon dynamics in two-dimensional phenylethylammonium lead bromide perovskites

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Nano Research 2023年第2期16卷 3408-3414页

作者： Minghuan Cui Chaochao Qin Zhongpo Zhou yuanzhi Jiang Shichen Zhang Zeye yuan mingjian yuan Kun Yu Yuhai Jiang Yufang Liu Henan Key Laboratory of Infrared Materials&Spectrum Measures and Applications School of PhysicsHenan Normal UniversityXinxiang 453007China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China Center for Transformative Science and School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Organic-inorganic layered perovskites are two-dimensional quantum well layers in which the layers of lead halide octahedra are stacked between the organic cation *** packing geometry of the soft organic molecules and the stiff ionic crystals induce structural deformation of the inorganic octahedra,generating complex lattice ***,the dielectric confinement and ionic sublattice lead to strong coupling between the photogenerated excitons and the phonons from the polar lattice which intensively affects the properties for device *** anharmonicity and dynamic disorder from the organic cations participate in the relaxation dynamics coupled with ***,a detailed understanding of this underlying mechanism remains *** work investigates the electron–optical phonon coupling dynamics by employing ultrafast pump-probe transient absorption *** activated different optical phonon modes are observed via systematic studies of(PEA)_(2)PbBr_(4) perovskite films on the ultrafast lattice vibrational *** experimental results indicate that solvent engineering has a significant influence on lattice vibrational modes and coherent phonon *** work provides fresh insights into electron-optical phonon coupling for emergent optoelectronics development based on layered perovskites.

关键词： two-dimensional perovskites electron–optical phonon coupling ultrafast dynamics transient absorption

Perovskite light-emitting diodes toward commercial full-colour displays:progress and key technical obstacles

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Light(Advanced Manufacturing) 2023年第3期4卷 272-291页

作者： Changjiu Sun yuanzhi Jiang Keyu Wei mingjian yuan Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai University300071TianjinChina

Metal-halide perovskite light-emitting diodes(PeLEDs)possess wide colour gamut,high luminescence efficiency,and low-cost synthesis,making them a promising photonic source for next-generation display *** the first room-temperature emission PeLED was demonstrated in 2014,their performance has improved rapidly within a few years,leading to considerable attention from academia and *** this review,we discuss the primary technical bottlenecks of PeLEDs for commercial display applications,including large-area PeLED preparation,patterning strategies,and flexible PeLED *** review the technical approaches for achieving these targets and highlight the current challenges while providing an outlook for these perovskite materials and PeLED devices to meet the requirements of the next-generation high-colour-purity full-colour display market.

关键词： Perovskite Light-emitting diodes Full-colour displays Large-area flexible LED

CoS_(2)nanowires supported graphdiyne for highly efficient hydrogen evolution reaction

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Journal of Energy Chemistry 2021年第9期30卷 272-278页

作者： Wangjing Xie Kang Liu Guodong Shi Xinliang Fu Xiaojie Chen Zixiong Fan Min Liu mingjian yuan Mei Wang Key Laboratory of Marine Chemistry Theory and Technology (Ministry of Education)College of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)Renewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai University300071 TianjinChina School of Physics and Electronics State Key Laboratory of Powder MetallurgyCentral South UniversityChangsha 410083China College of Science Henan University of TechnologyZhengzhou 450001China

Transition metal sulfides are an important category for hydrogen evolution reaction(HER).However,only few edge unsaturated sulfurs functionalize as catalytic sites,which has dramatically limited the catalytic activity and *** this work,planar unsaturated sulfurs in(211)plane of the CoS_(2)nanowires have been successfully activated through constructing Graphdiyne-CoS_(2)heterojunction *** corresponding electrons transfer energy barriers for these planar unsaturated sulfurs have been significantly diminished,which are induced by the synergetic effects of the sp~1 hybridized carbons and unsaturated planar *** addition,DFT simulations reveal the synergetic effects of the sp~1 hybridized carbons and unsaturated planar sulfurs can promote electron transfer kinetics of the key step,VolmerHeyrovsky step,of the *** expected,the Graphdiyne-CoS_(2)heterojunction nanocomposites exhibit superior HER catalytic performance with low overpotential of 97 mV at 10 mA cm^(-2),and the Tafel slope of 56 mV dec^(-1).Furthermore,the heterojunction shows outstanding stability as well due to the pr tection of the Graphdiyne(GDY).The approach thus paves the way for the further efficient transition metal disulfides catalyst manufactures.

关键词： Graphdiyne Electrocatalysts Hydrogen evolution reaction DFT simulation 2D carbon material