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Halide Perovskite Epitaxial Heterostructures

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Accounts of Materials Research 2020年第3期1卷 213-224页

作者： enzheng shi Letian Dou Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIndiana 47907United States School of Engineering Westlake UniversityHangzhou 310024Zhejiang ProvinceChina

CONSPECTUS:The past decade has witnessed the great success and rapid development of halide perovskite materials in photovoltaics and light-emitting devices,which is due to the inherently high photoluminescence quantum yield,long carrier diffusion length,high light absorption coefficient,great defect tolerance,and remarkable *** example,the record efficiency of perovskite solar cells has ramped up to 25.5%,comparable to single-crystal silicon solar *** combination with the facile solution processing,perovskite solar cells have gained tremendous attention and interest from both academia and the photovoltaic ***,as a newly emerging class of semiconductors with excellent properties and low manufacturing cost,it is also promising and meaningful to explore new applications beyond optoelectronic devices,such as transistors,lasers,and memory *** this end,the integration of different halide perovskites into epitaxial heterostructures provides an ideal *** the other hand,from the perspective of fundamental studies,halide perovskite heterostructures also provide a platform to directly visualize ion migration and to study the charge transfer behavior and anomalous exciton phenomena,*** aim of our Account is to summarize the synthetic strategies to achieve halide perovskite epitaxial heterostructures and to highlight the effective routes to stabilize halide perovskites and *** focus this Account on two-dimensional(2D)halide perovskites and emphasize the important roles the organic ligands ***,we discuss our recent findings on the incorporation of conjugated organic ligands into 2D halide perovskites leading to enhanced thermal and environmental stability and suppressed halide interdiffusion in the corresponding *** dynamics simulation and low-dose aberration corrected transmission electron microscopy were used as powerful tools to unveil and elucidate the working mechanism of stabil

关键词： perovskite halide directions

Direct fabrication of carbon nanotube-graphene hybrid films by a blown bubble method

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Nano Research 2015年第5期8卷 1746-1754页

作者： shiting Wu enzheng shi Yanbing Yang Wenjing Xu Xinyang Li Anyuan Cao Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China

有 graphene 的碳 nanotubes (CNT ) 的杂交提供集成两材料的属性的一个有希望的工具，从而创新的普遍申请。这里，我们在场直接由一个吹的水泡方法装配混合 CNT-graphene 电影的一个方法与选择底层退火结合了。我们把 polymethylmethac... 详细信息

有 graphene 的碳 nanotubes (CNT ) 的杂交提供集成两材料的属性的一个有希望的工具，从而创新的普遍申请。这里，我们在场直接由一个吹的水泡方法装配混合 CNT-graphene 电影的一个方法与选择底层退火结合了。我们把 polymethylmethacrylate (PMMA ) 用作聚合矩阵吹包含自我装配的多围的 CNT 数组的水泡，然后由在 Cu 底层上的热退火把水泡电影转变成一部 CNT-graphene 混合电影；PMMA 为在 CNT 网络之中对很少层 graphene 变得单个直到担任碳来源一连续地， hybridized 结构被形成。比作赤裸(non-hybridized ) CNT 联网，混合电影展览改进了电的电导率和结构的完整。我们的方法也启用一节多围的 CNT-Si 太阳能电池的制造，它有高力量变换效率，通过混合 CNT-graphene 结构的集会。

关键词：混合薄膜碳纳米管石墨泡法聚甲基丙烯酸甲酯结构完整性功率转换效率 NT网络

Recent progress in thermoelectric nanocomposites based on solution-synthesized nanoheterostructures

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Nano Research 2017年第5期10卷 1498-1509页

作者： Wei Zheng Biao Xu Lin Zhou Yilong Zhou Haimei Zheng Chenghan Sun enzheng shi Tanner Dale Fink Yue Wu Department of Chemical and Biological Engineering Iowa State University Ames IA 50011 USA Ames Laboratory Department of Energy Iowa State University Ames IA 50011 USA Material Science Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

Thermoelectric materials, which can convert waste heat into electricity, have received increasing research interest in recent years. This paper describes the recent progress in thermoelectric nanocomposites based on solution-synthesized nanoheterostructures. We start our discussion with the strategies of improving the power factor of a given material by using nanoheterostructures. Then we discuss the methods of decreasing thermal conductivity. Finally, we highlight a way of decoupling power factor and thermal conductivity, namely, incorporating phase-transition materials into a nanowire heterostructure. We have explored the lead telluride-copper telluride thermoelectric nanowire heterostructure in this work. Future possible ways to improve the figure of merit are discussed at the end of this paper.

关键词： thermoelectrics nanoheterostructures phase change

Origin of inhomogeneity in spark plasma sintered bismuth antimony telluride thermoelectric nanocomposites

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Nano Research 2020年第5期13卷 1339-1346页

作者： enzheng shi Shuang Cui Nicholas Kempf Qingfeng Xing Thomas Chasapis Huazhang Zhu Zhe Li Je-Hyeong Bahk G.Jeffrey Snyder Yanliang Zhang Renkun Chen Yue Wu Department of Chemical and Biological Engineering Iowa State UniversityAmesIA 50011USA Ames Laboratory Department of EnergyIowa State UniversityAmesIA 50011USA Department of Mechanical and Aerospace Engineering University of California-San DiegoLa JollaCA 92093USA Buildings and Thermal Sciences Center National Renewable Energy LaboratoryGoldenCO 80401USA Department of Aerospace and Mechanical Engineering University of Notre DameNotre DameIN 46556USA Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA Department of Mechanical and Materials Engineering University of CincinnatiCincinnatiOH 45221USA

Anisotropy and inhomogeneity are ubiquitous in spark plasma sintered thermoelectric ***,the origin of inhomogeneity in thermoelectric nanocomposites has rarely been investigated so ***,we systematically study the impact of inhomogeneity in spark plasma sintered bismuth antimony telluride(BiSbTe)thermoelectric nanocomposites fabricated from solution-synthesized *** figure of merit can reach 1.18,which,however,can be overestimated to 1.88 without considering the *** study reveals that the inhomogeneity in thermoelectric properties is attributed to the non-uniformity of porosity,textures and elemental distribution from electron backscatter diffraction and energy-dispersive spectroscopy *** finding suggests that the optimization of bulk material homogeneity should also be actively pursued in any future thermoelectric material research.

关键词： bismuth antimony telluride solution synthesis thermoelectrics inhomogeneity

Carbon nanotube-polypyrrole core-shell sponge and its application as highly compressible supercapacitor electrode

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Nano Research 2014年第2期7卷 209-218页

作者： Peixu Li enzheng shi Yanbing Yang Yuanyuan Shang Qingyu Peng shiting Wu Jinquan Wei Kunlin Wang Hongwei Zhu Quan Yuan Anyuan Cao Dehai Wu Department of Mechanical Engineering Tsinghua University Beijing 100084 China Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education) College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072 China Key Laboratory for Advanced Materials Processing Technology and School of Materials Science and Engineering Tsinghua University Beijing 100084 China

A carbon nanotube (CNT) sponge contains a three-dimensional conductive nanotube network, and can be used as a porous electrode for various energy devices. We present here a rational strategy to fabricate a unique CNT@polypyrrole (PPy) core-shell sponge, and demonstrate its application as a highly compressible supercapacitor electrode with high performance. A PPy layer with optimal thickness was coated uniformly on individual CNTs and inter-CNT contact points by electrochemical deposition and crosslinking of pyrrole monomers, resulting in a core-shell configuration. The PPy coating significantly improves specific capacitance of the CNT sponge to above 300 F/g, and simultaneously reinforces the porous structure to achieve better strength and fully elastic structural recovery after compression. The CNT@PPy sponge can sustain 1,000 compression cycles at a strain of 50% while maintaining a stable capacitance (> 90% of initial value). Our CNT@PPy core-shell sponges with a highly porous network structure may serve as compressible, robust electrodes for supercapacitors and many other energy devices.

关键词：超级电容器碳纳米管多孔电极聚吡咯可压缩海绵核壳应用

Graphene-CdSe Nanobelt Solar Cells with Tunable Configurations

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Nano Research 2011年第9期4卷 891-900页

作者： Luhui Zhang Lili Fan Zhen Li enzheng shi Xinming Li Hongbian Li Chunyan Ji Yi Jia Jinquan Wei Kunlin Wang Hongwei Zhu Dehai Wu Anyuan Cao Department of Advanced Materials and Nanotechnology College of Engineering Peking University Beijing 100871 China Key Laboratory for Advanced Materials Processing Technology and Department of Mechanical Engineering Tsinghua University Beijing 100084 China Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China

我们联合了二平面 nanostructures， graphene 和 CdSe nanobelts，到有大概 0.1% 的大约 0.5 V 和房间效率的开电路的电压的构造 Schottky 连接太阳能电池。由盖住，透明 graphene 或碳 nanotube (CNT ) 沿着肉眼可见地长的 CdSe nanob... 详细信息

我们联合了二平面 nanostructures， graphene 和 CdSe nanobelts，到有大概 0.1% 的大约 0.5 V 和房间效率的开电路的电压的构造 Schottky 连接太阳能电池。由盖住，透明 graphene 或碳 nanotube (CNT ) 沿着肉眼可见地长的 CdSe nanobelts 在选择位置上拍摄，我们从单个或多重的装配 nanobelts 与许多不同配置和平行连接表明了活跃太阳能电池的制造。graphene-CdSe nanobelt 太阳能电池这里报导了表演在创造多样的设备体系结构的大灵活性，和力量基于装配 nanobelt 数组和有图案的 graphene 为房间集成被扩大规模(或 CNT ) 电影。

关键词：太阳能电池 CdSe 纳米带石墨配置可调纳米结构开路电压

CuI-Si Heterojunction Solar Cells with Carbon Nanotube Films as Flexible Top-Contact Electrodes

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Nano Research 2011年第10期4卷 979-986页

作者： Peixu Li ShanshanWang Yi Jia Zhen Li Chunyan Ji Luhui Zhang Hongbian Li enzheng shi Zuqiang Bian Chunhui Huang Jinquan Wei Kunlin Wang Hongwei Zhu Dehai Wu Anyuan Cao Department of Mechanical Engineering Tsinghua University Beijing 100084 China College of Chemistry and Molecular Engineering Peking University Beijing 100871 China College of Engineering Peking University Beijing 100871 China Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China These authors contributed equally to this work.

我们作为一个透明电极与碳 nanotubes (CNT ) 报导 CuI-Si 异质接面太阳能电池的制造。一个灵活 CNT 网络被转移到多晶的 CuI 层的顶上，做有与内在的 CuI 的好接触的保角的涂层。太阳能电池在 6% ～ 10.5% 的范围显示出力量变换效率，... 详细信息

我们作为一个透明电极与碳 nanotubes (CNT ) 报导 CuI-Si 异质接面太阳能电池的制造。一个灵活 CNT 网络被转移到多晶的 CuI 层的顶上，做有与内在的 CuI 的好接触的保角的涂层。太阳能电池在 6% ～ 10.5% 的范围显示出力量变换效率，当在设备在空中被存储为 8 天以后，效率降级是不到 10% 时。与象铟听氧化物(ITO ) 那样的常规僵硬电极相比玻璃， CNT 电影的灵活性与活跃的层保证更好的接触并且为出版社接触电极移开需要。降级的房间能由 CNT 电极做的酸恢复他们的原来的表演。我们的结果建议 CNT 电影与不平的表面是为不平的材料和结构的合适的电的接触。

关键词：薄膜太阳能电池碳纳米管薄膜接触电极异质结顶部 Si 能量转换效率碳纳米管电极

Adaptive Space Expansion for Fast Motion Planning

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1499-1514页

作者： Shenglei shi Jiankui Chen State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The sampling process is very inefficient for sam-pling-based motion planning algorithms that excess random sam-ples are generated in the planning *** this paper,we pro-pose an adaptive space expansion(ASE)approach which belongs to the informed sampling category to improve the sampling effi-ciency for quickly finding a feasible *** ASE method enlarges the search space gradually and restrains the sampling process in a sequence of small hyper-ellipsoid ring subsets to avoid exploring the unnecessary ***,for a con-structed small hyper-ellipsoid ring subset,if the algorithm cannot find a feasible path in it,then the subset is ***,the ASE method successively does space exploring and space expan-sion until the final path has been ***,we present a particular construction method of the hyper-ellipsoid ring that uniform random samples can be directly generated in *** last,we present a feasible motion planner BiASE and an asymptoti-cally optimal motion planner BiASE*using the bidirectional exploring method and the ASE *** demon-strate that the computation speed is much faster than that of the state-of-the-art *** source codes are available at https://***/shshlei/ompl.

关键词： Adaptive space expansion(ASE) hyper-ellipsoid ring informed sampling motion planning.

Quantization and Event-Triggered Policy Design for Encrypted Networked Control

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 946-955页

作者： Yongxia shi Ehsan Nekouei the Department of Electrical Engineering City University of Hong KongHong KongChina

This paper proposes a novel event-driven encrypted control framework for linear networked control systems(NCSs),which relies on two modified uniform quantization policies,the Paillier cryptosystem,and an event-triggered *** to the fact that only integers can work in the Pailler cryptosystem,both the real-valued control gain and system state need to be first quantized before *** is dramatically different from the existing quantized control methods,where only the quantization of a single value,e.g.,the control input or the system state,is *** handle this issue,static and dynamic quantization policies are presented,which achieve the desired integer conversions and guarantee asymptotic convergence of the quantized system state to the ***,the quantized system state is encrypted and sent to the controller when the triggering condition,specified by a state-based event-triggered strategy,is *** doing so,not only the security and confidentiality of data transmitted over the communication network are protected,but also the ciphertext expansion phenomenon can be ***,by tactfully designing the quantization sensitivities and triggering error,the proposed event-driven encrypted control framework ensures the asymptotic stability of the overall closedloop ***,a simulation example of the secure motion control for an inverted pendulum cart system is presented to evaluate the effectiveness of the theoretical results.

关键词： Cyber-security encrypted control event-triggered control(ETC) networked control systems(NCSs) semi-homomorphic encryption