检索结果-南通市图书馆

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

在线全文

学校读者我要写书评

暂无评论

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

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

在线全文

学校读者我要写书评

暂无评论

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

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

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

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

在线全文

学校读者我要写书评

暂无评论

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

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

酬金制下物业管理会计核算模式初探

价值工程 2010年第27期29卷 6-7页

作者：蒋园枝第一太平戴维斯物业顾问(成都)有限公司重庆分公司重庆404100

酬金制物管模式是我国未来物管行业的发展方向。本文从我国目前酬金制物管的现状入手,通过对代管基金进行合理分类和定性分析,力求呼吁解决在酬金制下税收政策和会计处理方法的矛盾,使其向着有利于企业健康的方向发展。

关键词：酬金制现状代管资金矛盾发展

在线全文

学校读者我要写书评

暂无评论

摆线针轮传动时变微观弹流润滑数值分析

机械传动 2016年第8期40卷 16-19,59页

作者：姜元志王优强青岛理工大学机械工程学院山东青岛266033 青岛农业大学机电工程学院山东青岛266109

结合摆线针轮传动中啮合点处综合曲率半径、卷吸速度、轮齿载荷随时间变化的特点,利用多重网格技术,得到了摆线针轮时变微观弹流润滑的完全数值解,分别讨论了单独粗糙峰和粗糙谷对弹流润滑的影响,并与其光滑解进行了比较。结果表明,粗... 详细信息

结合摆线针轮传动中啮合点处综合曲率半径、卷吸速度、轮齿载荷随时间变化的特点,利用多重网格技术,得到了摆线针轮时变微观弹流润滑的完全数值解,分别讨论了单独粗糙峰和粗糙谷对弹流润滑的影响,并与其光滑解进行了比较。结果表明,粗糙度的存在,能较大程度影响油膜压力,但对油膜厚度影响轻微;并且粗糙峰和粗糙谷对油膜压力影响有明显的不同表现。

关键词：粗糙峰粗糙谷微观弹流润滑摆线针轮

Advances in Triboelectric Nanogenerators for Blue Energy Harvesting and Marine Environmental Monitoring

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Engineering 2024年第2期33卷 204-224页

作者： Yang jiang Xi Liang Tao jiang Zhong Lin Wang CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro–Nano Energy and SensorsBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Georgia Institute of Technology AtlantaGA 30332USA

Blue energy,which includes rainfall,tidal current,wave,and water-flow energy,is a promising renewable resource,although its exploitation is limited by current technologies and thus remains *** form of energy is mainly harvested by electromagnetic generators(EMGs),which generate electricity via Lorenz force-driven electron *** nano genera tors(TENGs)and TENG networks exhibit superiority over EMGs in low-frequency and high-entropy energy harvesting as a new approach for blue energy harvesting.A TENG produces electrical outputs by adopting the mechanism of Maxwell’s displacement *** date,a series of research efforts have been made to optimize the structure and performance of TENGs for effective blue energy harvesting and marine environmental *** the great progress that has been achieved in the use of TENGs in this context so far,continuous exploration is required in energy conversion,device durability,power management,and environmental *** review reports on advances in TENGs for blue energy harvesting and marine environmental *** introduces the theoretical foundations of TENGs and discusses advanced TENG prototypes for blue energy harvesting,including TENG structures that function in freestanding and contact-separation *** enhancement strategies for TENGs intended for blue energy harvesting are also ***,marine environmental applications of TENGs based on blue energy harvesting are discussed.

关键词： Triboelectric nanogenerator TENG networks Blue energy Energy harvesting Ocean sensors

在线全文

学校读者我要写书评

暂无评论

滑动电接触界面粗糙度对电枢熔化特性的影响

电工技术学报 2018年第7期33卷 1607-1615页

作者：李白鲁军勇谭赛姜远志张永胜赫蕾海军工程大学舰船综合电力技术国防科技重点实验室武汉430074 不详

电磁发射过程中电枢表面熔化会改变枢轨接触状态,一旦接触状态被破坏则容易出现转捩,因此有必要对电枢表面的熔化特性进行分析。考虑枢轨接触面的粗糙度,列出了枢轨接触界面间金属液化层的Reynolds方程,并耦合温度场、应力场及电磁场,... 详细信息

电磁发射过程中电枢表面熔化会改变枢轨接触状态,一旦接触状态被破坏则容易出现转捩,因此有必要对电枢表面的熔化特性进行分析。考虑枢轨接触面的粗糙度,列出了枢轨接触界面间金属液化层的Reynolds方程,并耦合温度场、应力场及电磁场,建立了热弹性磁流体动力学模型,在此基础上分析了粗糙度量级及分布形态对枢轨接触面间电枢表面熔化速度与金属液化层厚度的影响。结果表明,在设定参数下的动态发射过程中,枢轨接触面粗糙度量级越大,电枢表面的熔化速度越大,最小液化层厚度也越大;相比于粗糙的分布形态,粗糙度量级对电枢表面的熔化速度和金属液化层厚度的影响更大。分析结果对于改善枢轨接触状态,避免转捩情况的发生具有重要意义。

关键词：滑动电接触粗糙度熔化金属液化层磁流体动力学