Superionic conductors offer unique advantages for novel technological devices in various fields, such as energy storage and neuromorphic computing. Above 414 K, Cu2Se turns into a well-known superionic conductor via a phase transition, and it is demonstrated to exhibit peculiar electrical and thermoelectric properties in bulk. Here, we report a large-area synthesis of ultra-thin single crystalline Cu2Se using the chemical vapor deposition method. We demonstrate that Cu2Se crystals exhibit optically and electrically controllable robust phase reconfiguration below 414 K. Moreover, our results show that the mobility of the liquid-like Cu ion vacancies in Cu2Se causes macroscopic fluctuations in the Cu ordering. Consequently, phase variations are not dictated by the diffusive motion of the ions but by the local energy minima formed due to the interplay between the extrinsic and the intrinsic material parameters. As a result, long-range ordering of the crystal below 414 K is optically observable at a micrometer scale. Our results show that Cu2Se could find applications beyond thermoelectric such as smart optical coatings, optoelectronic switching, and ionic transistors.
Beijing Institute of Technology（北京理工大学）；Nanyang Technological University（南洋理工大学）；Henan Polytechnic University（河南理工大学）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；RIKEN（理化学研究所）；Beihang University（北京航空航天大学）
Synthesis and Structural Analysis of an Emissive Colloidal Argyrodite Nanocrystal: Canfieldite Ag8SnS6
Istituto Italiano di Tecnologia（意大利理工大学）；University of Toronto（多伦多大学）；Concordia University（康考迪亚大学）；Momentum Transfer GmbH（Momentum Transfer有限公司）；University of Toronto, Department of Materials Science and Engineering（多伦多大学材料科学与工程系）
Synthesis of Ultra-thin Potassium Tungsten Bronze Single Crystals with Optically Contrasting Domains and Resistive Switching
National Nanotechnology Research Center – UNAM（国家纳米技术研究中心 - UNAM）；Institute of Materials Science and Nanotechnology, Bilkent University（比尔肯特大学材料科学与纳米技术研究所）；Department of Engineering Fundamental Sciences, Sivas University of Science and Technology（锡瓦斯科技大学工程基础科学系）；Sivas Cumhuriyet University Nanophotonics Application and Research Center CÜNAM（锡瓦斯恰姆舍巴特大学纳米光子学应用与研究中心 CÜNAM）；Department of Physics, Bilkent University（比尔肯特大学物理系）；Department of Physics, Middle East Technical University（中东理工大学物理系）
Two-step flux synthesis of ultrapure transition metal dichalcogenides
在这里，我们描述了合成的TMD晶体使用两步助熔剂生长方法，消除了主要的潜在污染源。详细的表征，通过这两步方法生长的TMD揭示了带电和等价的缺陷密度的数量级低于通过一个单步通量技术生长的TMD。单层WSe 2的初始温度相关电输运测量产生高于840 cm 2/Vs的室温空穴迁移率和高于44，000 cm 2/Vs的低温无序限制迁移率。由两步助熔剂生长的WSe 2制造的石墨烯-WSe 2异质结构的电输运测量也显示出优异的性能：更高的石墨烯迁移率、更低的带电杂质密度和良好分辨的整数量子霍尔态。
Structural study and evaluation of thermoelectric properties of single-phase isocubanite (CuFe2S3) synthesized via an ultra-fast efficient microwave radiation technique
Ultra-high-vacuum cluster tool for epitaxial synthesis and optical spectroscopy of reactive 2D materials
Walter Schottky Institute and TUM School of Natural Sciences, Technical University of Munich（慕尼黑工业大学沃尔特·肖特基研究所与自然科学学院）；Cavendish Laboratory, University of Cambridge（剑桥大学卡文迪许实验室）
One-reactor vacuum and plasma synthesis of transparent conducting oxide nanotubes and nanotrees: from single wire conductivity to ultra-broadband perfect absorbers in the NIR
一维纳米材料的最终开发还需要开发可扩展的、高产率的、均质的和环境友好的方法，以满足设计中的功能纳米材料的制造要求。在这篇文章中，我们展示了真空和等离子体一反应器的方法，用于合成太阳能和光电子学中的基本共同元素，即透明导电电极，但以纳米管和纳米树结构的形式。虽然该工艺是通用的，可用于各种TCO和宽带隙半导体，但我们在本文中重点关注铟掺杂氧化锡（ITO），因为它在以前的应用中得到了最大的扩展。该协议结合了广泛应用的沉积技术，如热蒸发形成的有机纳米线作为1D和3D软模板，多晶层的磁控溅射沉积，并通过简单的退火在温和的真空条件下的模板的去除。调整工艺变量以控制ITO纳米管和纳米树的化学计量、形态和排列。四探针表征揭示了ITO纳米树的改进的横向连接性，并且应用于单个纳米管显示出低至3.5 +/- 0.9 x 10-4 Ω.cm的折射率，该值与单晶对应物相当。在UV-VIS范围内的漫反射率和透射率的评估证实了作为强散射层工作的随机光学介质的支撑ITO纳米管的可行性。形成ITO纳米树的进一步能力为实际应用开辟了道路，作为NIR中的超宽带吸收剂。这些ITO纳米结构的低电阻率和光学特性为它们在LED、IR屏蔽、能量收集、纳米传感器和光电化学应用中的应用开辟了道路
