Dimensional perovskite halide epitaxial lateral heterojunction

April 24 morning, the top international academic journal \”Science\” published online at the same time two important findings Shanghai University of Science and Technology are the first completed units.

Institute of immunochemical research team successfully resolve key mycobacteria Arab glycosyltransferase complex \”target drug – drug\” three-dimensional structure, for the first time revealed the first-line anti-TB drugs B amine alcohol acts on the precise molecular mechanism of the target (study long article) ; won an important breakthrough in the study of obesity drugs target · iHuman Institute research team , for the first time to resolve human melanocortin receptor atomic resolution crystal structure (Research report) 4.

in less than a week, Shanghai University of Science and Technology Professor Yu Yi Task Force and Purdue University professor Letian Dou (Dou music Tim) , Professor Brett Savoie cooperation , has made important progress in the research of new junctions in semiconductor heterostructures, the first successful preparation and characterization of two-dimensional halide epitaxial perovskite lateral heterojunction. Beijing on the evening of April 29, the research results to \”Two-dimensional halide perovskite lateral epitaxial heterostructures\” in the title, published online in top international academic journals \”Nature\” (Nature). 二维卤化物钙钛矿横向外延异质结 The semiconductor material is the basis of the information age, the precise preparing a semiconductor heterojunction semiconductor device is the starting point, is the cornerstone of modern electronics and optoelectronics. As the information society and improve product performance requirements, while undergoing a semiconductor material represented by silicon simple substance semiconductors, gallium arsenide and the like and represented by gallium nitride compound semiconductor as the wide bandgap semiconductor represented by three generations the rapid development of semiconductor materials, but still can not meet people\’s thirst for new semiconductor materials. Halide perovskite material as a new class of semiconductors in recent years caused widespread concern, exhibit potential application in the field of solar cells, light emitting diodes, laser or the like. Meanwhile, with the conventional semiconductor covalentDifferent body, perovskite materials halide high tolerance for defects, and therefore has a unique advantage in the large scale integration device further constructed and heterojunction. On the road to build halide perovskite semiconductor heterojunction, There are two scientific problem has not been resolved at the international level. Since the material aspect of ion diffusion prone, difficult to obtain a high quality hetero atomically flat interface. On the other hand, the perovskite halide to air, moisture, and other factors sensitive to electron beam irradiation, the microstructure resolution, in particular atomic structure of the imaging difficult. Lack of information on the atomic structure of guidance materials to build accurate difficult to carry out design and performance. Our hospital with Purdue University research team to work together to Wilson Task Force, made a breakthrough in both the forefront of solving problems. ion diffusion is suppressed by the introduction of organic ligands rigid material during the manufacturing process, Purdue team successfully preparing a two-dimensional organic – inorganic hybrid perovskite halide lateral heterojunction. Wilson Task Force in the development of low-dose aberration-corrected electron microscopy, for the first time revealed the two-dimensional lateral heterojunction interface atomic structure, directly strong evidence that the Purdue University team has successfully obtained atom grade level interface. contains a large amount of organic component, such organic – inorganic hybrid perovskite material system is a halide the most radiation-sensitive one, to the high-resolution structure analysis huge challenge, especially in the two-dimensional organic – inorganic hybrid perovskite halide atomic resolution imaging still had never been implemented. On microscopic imaging for radiation-sensitive materials, today was undoubtedly the most effective means of cryo-biological technology in 2017 awarded the Nobel Prize in Chemistry. Biological samples are typically the most sensitive to the irradiated materials, but a few nanometers thick two-dimensional organic – inorganic halide perovskite materials since the binding force between atoms which significantly weakened, in the process of electron microscopic observation, becomes larger than the organisms molecules also vulnerable to their atomic scale structure analysis, the most advanced technology and biological materials cryo electron microscopy, aberration correction is difficult to achieve. Based on the Wilson team aberration correction electron microscopy study of many years of accumulated experience and technology, further development of low doses of aberration-corrected electron microscopy, through trial and error and repeated attempts to improve the long, finally found in a species optimized low-dose imaging method, the first time the radiation-sensitive two-dimensional atomic structure of a lateral heterojunction resolution. This breakthrough providedInterface atomic structure, and the lattice strain defective configurations such accurate information, provides the most intuitive guidance for such new semiconductor heterojunction microstructure design. In these findings, based on the entire research team to further work together successfully demonstrated a new type of heterojunction rectifying effect prototype devices, verify that the prospect of this new class of semiconductors to the application.

二维卤化物钙钛矿横向外延异质结
High-resolution lattice at the heterojunction interface like

Electron Microscopy Center, School of Physical Science and Technology, Shanghai University of Science and Technology (CħEM) After several years of construction and run, we have built up a diverse, open platform for advanced electron microscopy, the research group at Wilson 2017 graduate Shuoboliandu original Biao It is in this freedom, growth and innovative research environment under study, along with mentor We made a breakthrough in research. Director of the Center for Electron Microscopy, professor well-known electron microscopy expert Osamu Terasaki the research, commented: \”Shanghai University of Science and Technology is a young and vibrant university, college young professor substance to the original Biao Yi to guide students in the two-dimensional titanium halide calcium ore lateral epitaxial heterojunction aspects made remarkable achievements. Electron microscopy Center is pleased to support this challenging and original research projects. CћEM and I congratulate the research team to outstanding young professors and graduate students made . \”in this study, and material Science and technology 2017 Ph.D graduate from Purdue University postdoctoral Enzheng Shi (Shien government) Shanghai University of Science and technology original Biao as co-first author of the paper. Purdue University Letian Dou (Dou music Tim) Professor , Professor Brett Savoie and a professor at Shanghai University of Science and Technology Yi co-corresponding author for the paper. Sample preparation and synthesis of molecular dynamics simulation done by Purdue University team studied the atomic scale microstructure is completed by the Shanghai University of Science and Technology team. In addition, MIT, UC Berkeley research team is also involved in the study. The research was supported by start-up funding research, the National Natural Science Foundation of youth, substance Electron Microscopy Center College of Shanghai University of Science and Technology (CћEM) and the Shanghai Science and Technology Natural Science Foundation of Shanghai University of Science and Technology. Article link: https: // www.nature.com / articles / is 41586-020-2219-7

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