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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 layers.The packing geometry of the soft organic molecules and the stiff ionic crystals induce structural deformation of the inorganic octahedra,generating complex lattice dynamics.Especially,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 applications.The anharmonicity and dynamic disorder from the organic cations participate in the relaxation dynamics coupled with excitations.However,a detailed understanding of this underlying mechanism remains obscure.This work investigates the electron–optical phonon coupling dynamics by employing ultrafast pump-probe transient absorption spectroscopy.The activated different optical phonon modes are observed via systematic studies of(PEA)_(2)PbBr_(4) perovskite films on the ultrafast lattice vibrational dynamics.The experimental results indicate that solvent engineering has a significant influence on lattice vibrational modes and coherent phonon dynamics.This 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

Suppressing trap states and energy loss by optimizing vertical phase distribution through ternary strategy in organic solar cells

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Science China Chemistry 2021年第4期64卷 599-607页

作者： Pengqing Bi Shaoqing Zhang Tong Xiao minghuan cui Zhihao Chen Junzhen Ren Chaochao Qin Guanghao Lu Xiaotao Hao Jianhui Hou State Key Laboratory of Polymer Physics and Chemistry Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory of Crystal Materials School of PhysicsShandong UniversityJinan 250100China School of Chemistry and Biology Engineering University of Science and Technology BeijingBeijing 100083China Frontier Institute of Science and Technology State Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710054China Department of Physics Henan Normal UniversityXinxiang 453007China

Suppressing the trap-state density and the energy loss via ternary strategy was demonstrated.Favorable vertical phase distribution with donors(acceptors)accumulated(depleted)at the interface of active layer and charge extraction layer can be obtained by introducing appropriate amount of polymer acceptor N2200 into the systems of PBDB-T:IT-M and PBDB-TF:Y6.In addition,N2200 is gradiently distributed in the vertical direction in the ternary blend film.Various measurements were carried out to study the effects of N2200 on the binary systems.It was found that the optimized morphology especially in vertical direction can significantly decrease the trap state density of the binary blend films,which is beneficial for the charge transport and collection.All these features enable an obvious decrease in charge recombination in both PBDB-T:IT-M and PBDB-TF:Y6 based organic solar cells(OSCs),and power conversion efficiencies(PCEs)of 12.5%and 16.42%were obtained for the ternary OSCs,respectively.This work indicates that it is an effective method to suppress the trap state density and thus improve the device performance through ternary strategy.

关键词： non-fullerene organic solar cells ternary strategy vertical phase distribution trap state density energy loss

3-6 Molecular Dynamics Simulation of Displacement Cascade under Strain Field in Tungsten

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IMP & HIRFL Annual Report 2015年第1期 96-98页

作者： Wang Dong Gao Ning Wang Zhiguang Gao Xing He Wenhao cui minghuan 不详

Due to its unique properties, e:g: high melting temperature, high thermal conductivity and low sputtering erosion, tungsten has been selected as one of the most promising candidate materials for the divertor in ITER and future fusion devices. In the extreme environment of fusion reactors, tungsten will not only be exposed to high energy particles such as hydrogen, helium and neutrons, which lead to heavy radiation damages, but also suffer from the combined high thermal fluxes and high mechanical stresses.

关键词： Molecular Dynamics Simulation

北京新航城地区地面沉降演化规律及多源监测方法对比研究

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地质科技通报 2023年第1期42卷 398-406页

作者：刘贺罗勇雷坤超崔文君齐鸣欢赵龙孔祥如北京市地质环境监测所北京100195

为查明北京新航城地区地面沉降演化规律,结合基岩标-分层标和水准测量对新航城地区地面沉降特征进行了分析,并结合不同监测方法进行了对比研究评价。研究发现:(1)近十年新航城地区浅部地层中沉降量和沉降比例越来越小,沉降比例由2009年6... 详细信息

为查明北京新航城地区地面沉降演化规律,结合基岩标-分层标和水准测量对新航城地区地面沉降特征进行了分析,并结合不同监测方法进行了对比研究评价。研究发现:(1)近十年新航城地区浅部地层中沉降量和沉降比例越来越小,沉降比例由2009年67.62%下降到2019年19.69%,而中部地层和深部地层则随着时间沉降量和沉降比例越来越大,中部地层沉降比例由2009年21.39%增加到2019年35.83%,深部地层沉降比例则由2009年10.99%增加到2019年44.48%;浅部地层含水层水位呈现周期性往复变化,中部和深部地层含水层在周期性变化中持续下降,地层在水位周期性往复变化中持续压缩。(2)根据历年水准测量和地下水动态监测成果,研究区自北向南累计沉降量逐渐减小。地面沉降和地下水位数据拟合后发现二者具有一定的相关性,相关性随着水位降幅的增大,相关性也随之增大,二者成正相关。(3)基岩标—分层标静力水准测量系统与人工水准测量系统对同一监测点和不同深度数据互校后的误差值非常接近,符合正态分布规律,不同深度的监测数据相关系数为0.993 6;对比2种方法各有优势与不足,应根据实际情况,多方面获取沉降信息与数据,满足地区级地面沉降监测与防治的不同需求。

关键词：北京新航城地面沉降监测方法演化规律基岩标-分层标水准测量

Atomistic insights into early stage corrosion of bcc Fe surfaces in oxygen dissolved liquid lead-bismuth eutectic(LBE-O)

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Chinese Physics B 2023年第3期32卷 384-395页

作者：周婷高星马志伟常海龙申铁龙崔明焕王志光 Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

Classical molecular dynamics simulations with global neural network machine learning potential are used to study early stage oxidation and dissolution behaviors of bcc Fe surfaces contacting with stagnant oxygen dissolved liquid leadbismuth eutectic(LBE-O).Both static and dynamic simulation results indicate that the early stage oxidation and dissolution behaviors of bcc Fe show strong orientation dependence under the liquid LBE environments,which may explain the experimental observations of uneven interface between iron-based materials and liquid LBE.Our investigations show that it is the delicate balance between the oxide growth and metal dissolution that leads to the observed corrosion anisotropy for bcc Fe contacting with liquid LBE-O.

关键词： liquid lead-bismuth eutectic(LBE) global neural network(G-NN)potential dissolution

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准二维钙钛矿超快动力学的研究进展

河南师范大学学报（自然科学版） 2023年第4期51卷 1-10,F0002页

作者：江玉海孙鹏云崔明焕秦朝朝河南师范大学物理学院河南新乡453007 河南师范大学生命科学学院上海201210 上海科技大学物质科学与技术学院河南新乡453007

基于三维有机-无机杂化钙钛矿光电转换材料制备的光电器件的环境稳定性较差,严重阻碍了其大规模商业应用,准二维钙钛矿有望解决这一问题.准二维钙钛矿打破了三维钙钛矿结构上的对称性,突破了容忍因子的限制.此外,材料的激子结合能较大,... 详细信息

基于三维有机-无机杂化钙钛矿光电转换材料制备的光电器件的环境稳定性较差,严重阻碍了其大规模商业应用,准二维钙钛矿有望解决这一问题.准二维钙钛矿打破了三维钙钛矿结构上的对称性,突破了容忍因子的限制.此外,材料的激子结合能较大,表现出较强的量子和介电限域效应,拥有特殊的载流子动力学和光物理特性.目前准二维钙钛矿光电转换器件的效率仍然与三维钙钛矿相差较大,因此必须对其内部的超快动力学和物理机制进行深入研究,为进一步优化器件性能提供指导.总结了准二维钙钛矿光电转换器件的研究进展,归纳了准二维钙钛矿的俄歇复合、能量转移和电荷转移等超快动力学特性,分析了准二维钙钛矿光电转换器件目前面临的问题并对其未来的研究趋势进行了展望.

关键词：准二维钙钛矿俄歇复合能量转移电荷转移超快动力学

4-12 Mechanical Properties of Monocrystalline Tungsten Simulated with Molecular Dynamics

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IMP & HIRFL Annual Report 2016年第1期 124-125页

作者： Wang Dong Gao Ning He Wenhao cui minghuan Gao Xing Wang Zhiguang 不详

Due to its unique properties,e:g:high melting temperature,high thermal conductivity and low sputtering erosion,tungsten(W)has been selected as one of the most promising candidate materials for the divertor in ITER and future fusion devices[1].In fusion reactors,tungsten will suffer from radiation damages by energetic particles,leading to the degradation of material properties,affecting the life time of components.Void is one of important typical radiation defects.It changes the local stress field,which influences the dislocation behaviors and the mechanical properties of materials.

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3-7 Molecular Dynamics Simulation of Threshold Displacement Energy under Strain Field in Tungsten

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IMP & HIRFL Annual Report 2015年第1期 98-99页

作者： Wang Dong Gao Ning Wang Zhiguang Gao Xing He Wenhao cui minghuan 不详

Tungsten has been selected as one of the most promising candidate materials for the divertor in the International Thermonuclear Experimental Reactor (ITER) and future fusion devices due to its unique properties, e:g: high melting temperature, high thermal conductivity and low sputtering erosion. In fusion reactors, tungsten will be exposed to high-energy particles, which result in microstructure and property changes[1], affecting the lifetime of divertor and reactor.

关键词： Strain Field Tungsten

3 - 4 Microstructural and Nano-hardness Changes in He Irradiated 6H-SiC

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IMP & HIRFL Annual Report 2013年第1期 65-66页

作者： Li Bingsheng Wang Zhiguang Du Yangyang Sun Jianrong cui minghuan Wei Kongfang Yao Cunfeng