Exploring new materials for future electronics
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Exploring new materials for future electronics

　　Imagine a world where our electronic devices are smarter and faster, lighter, more flexible, and capable of pushing the boundaries of what we thought was possible.　　Examining the research underway in electronics materials provides a keyhole view into what may be possible in future electronics design. Although some of this research will not end up in commercial products, it does provide an indication of the kinds of problems that are being addressed, how they are being approached, and where the research dollars are being spent.　　Designers and manufacturers from many industries are facing new challenges as they develop next-generation products while working to fulfill evolving consumer needs. With a broad portfolio of electronics materials and global technical expertise, we are ready to deliver on today’s needs and collaborate with you on tomorrow’s challenges. Together we can help you achieve faster processing, higher purity, higher conductivity and more sustainable solutions across the entire electronics value chain.　　· Semiconductor, novel display and printed circuit board applications: Providing high purity, low metal, consistent quality solvents, amines, chelants, and surfactants for photo resist, color resist, etchant, stripper and thinner applications　　· Silicone solutions for display applications: Offering optically clear silicone resins (OCRs), including UV cure and other cure systems for displays, silicone thermal conductives for heat management in displays, as well as materials for assembly and protection　　· Electronic and advanced modules/systems applications: Delivering solutions for electronic modules, sensors and components used across segments in the electronics industry – including silicone and polyurethane sealants, adhesives, thermal and electrical conductives, electromagnetic interference (EMI) conductives, conformal coatings, gels and encapsulants that protect against heat, moisture, contamination and vibration　　· Energy applications: Delivering heat transfer and cooling fluids to protect a wide variety of electronics from damaging heat　　· Printed circuit board assemblies: Delivering an industry leading line of gels and pottants, thermally conductive materials, optically clear materials, conformal coatings and encapsulants to enable compact devices and help draw heat away from sensitive components　　· Battery and e-mobility applications: Providing cathode, anode, slurry, coatings, electrolyte, thermally conductive interface materials, foams, gels, and assembly materials like adhesives or sealants for battery, inverter, electric motor, on-board charger and other applications　　While the prospect of technological use is still far off, this new material opens up new avenues in the exploration of very high-speed electromagnetic signal manipulation. These results can also be used to develop new sensors. The next step for the research team will be to further observe how this material reacts to high electromagnetic frequencies to determine more precisely its potential applications.
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Release time：2023-07-17 15:10 reading：2231 Continue reading>>
<span style='color:red'>New material</span> design space discovered for light-based applications
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New material design space discovered for light-based applications

Materials scientists at Duke University claim to have computationally predicted the electrical and optical properties of semiconductors made from extended organic molecules sandwiched by inorganic structures. These types of so-called layered "hybrid organic-inorganic perovskites" (HOIPs) are popular targets for light-based devices such as solar cells and LEDs. The ability to build accurate models of these materials atom-by-atom will allow researchers to explore new material designs for next-generation devices."Ideally, we would like to be able to manipulate the organic and inorganic components of these types of materials independently and create semiconductors with new, predictable properties," said Professor David Mitzi of Duke. "This study shows that we are able to match and explain the experimental properties of these materials through complex supercomputer simulations.”HOIPs are a promising class of materials according to the scientists, due to their combined strengths of their constituent organic and inorganic pieces. Organic materials have more desirable optical properties and may be bendable, but can be ineffective at transporting electrical charge. Inorganic structures, on the other hand, are typically good at conducting electricity and offer more robust mechanical strength.Combining the two can affect their individual properties while creating hybrid materials with the best of both worlds, the researchers reveal. But, understanding the electronic and atomic-scale consequences of their interaction is challenging at best, since the resulting crystals or films can be structurally complex. However, as these particular HOIPs have their organic and inorganic components in well-ordered layers, their structures are somewhat easier to model, and researchers are now beginning to have success at computationally predicting their behaviours on an atomic level."The computational approach we used has rarely been applied to structures of this size," said Associate Professor Volker Blum of Duke. "We couldn't have done it even just 10 years ago. Even today, this work would not have been possible without access to one of the fastest supercomputers in the world."That supercomputer - dubbed Theta - is currently the 21st fastest in the world and resides at Argonne National Laboratory. The group was able to gain time on the behemoth through Blum securing one of only a dozen Theta Early Science Projects, aimed at paving the way for other applications to run on the system first launched in late 2017. They are now co-investigators on one of Department of Energy's "Innovative and Novel Computational Impact on Theory and Experiment" (INCITE) awards, enabling them to continue their work.In their study, the team used Theta's computational power to model the electronic states within a layered HOIP first synthesised by Mitzi more than ten years ago. While the electrical and optical properties of the material are well-known, the physics behind how they emerge have been much debated.The team believe to now have settled this debate.In a series of computational models, the team calculates the electronic states and localises the valence band and conduction band of the HOIP's constituent materials, the organic bis(aminoethyl)-quaterthiophene (AE4T) and the inorganic lead bromide (PbBr4). These properties dictate how electrons travel through and between the two materials, which determines the wavelengths and energies of light it absorbs and emits, among other important properties such as electrical conduction.The results showed that the team's computations and experimental observations match, proving that the computations can accurately model the behaviours of the material.The team furthered their study by tweaking the materials – varying the length of the organic molecular chain and substituting chlorine or iodine for the bromine in the inorganic structure – and running additional computations.The team are also working on synthesising these variations to further verify their theoretical models.The work is part of a larger initiative called the HybriD3 project aimed at discovering and fine-tuning new functional semiconductor materials. The collaborative effort features a total of six teams of researchers. Joining those researchers located at Duke University and the University of North Carolina at Chapel Hill, Professors Kenan Gundogdu and Franky So at North Carolina State University are working to further characterise the materials made in the project, as well as exploring prototype LEDs."By using the same type of computation, we can now try to predict the properties of similar materials that do not yet exist," said Prof. Mitzi. "We can fill in the components and, assuming that the structure doesn't change radically, provide promising targets for materials scientists to pursue."The idea is that this will allow scientists to more easily search for better materials for a wide range of applications. For this particular class of materials, that includes lighting and water purification.Inorganic light sources are typically surrounded by diffusers to scatter and soften their intense, concentrated light, which leads to inefficiencies. This class of layered HOIPs could make films that achieve this more naturally while wasting less of the light, according to the scientists. For water purification, the material could be tailored for efficient high-energy emissions in the ultraviolet range, which can be used to kill bacteria."The broader aim of the project is to figure out the material space in this class of materials in general, well beyond the organic thiophene seen in this study," said Assoc Prof. Blum. "The key point is that we've demonstrated we can do these calculations through this proof of concept. Now we have to work on expanding it."
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Release time：2018-10-11 00:00 reading：1280 Continue reading>>
Spin current from heat: new material increases efficiency
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Spin current from heat: new material increases efficiency

　　Physicists at Bielefeld University have found a way to use the heat from electronic devices to create energy, applying the heat to generate magnetic signals known as ‘spin currents’.　　According to researchers it could be possible in the future to use these signals to replace some of the electrical current currently used in electronic components.　　In a new study, physicists from the University of Greifswald, Gie?en University, and the Leibniz Institute for Solid State and Materials Research in Dresden tested which materials generated this spin current most effectively from heat. Their findings have been published in the research journal ‘Nature Communications’.　　The Bielefeld physicists are working on the basic principles for making data processing more effective and energy-efficient in the young field of ‘spin caloritronics’ and the study determines the strength of the spin current for various combinations of thin films.　　A spin current is produced by differences in temperature between two ends of an electronic component. These components are extremely small and only one millionth of a millimetre thick. Because they are composed of magnetic materials such as iron, cobalt, or nickel, they are called magnetic nanostructures.　　The physicists take two such nanofilms and place a layer of metal oxide between them usually only a few atoms thick. One of the external films is then heated and then electrons with a specific spin orientation then pass through the metal oxide. This produces the spin current.　　The teams led by Dr. Alexander B?hnke and Dr. Torsten Hübner have tested different combinations of ultra-thin films. ‘Depending on which material we used, the strength of the spin current varied markedly,’ says B?hnke. ‘That is because of the electronic structure of the materials we used.’　　According to the researchers, magnetic nanostructures with special combinations made up of cobalt, iron, silicon, and aluminium were particularly productive.　　The study is one of a number of projects in the ‘Spin Caloric Transport’ (SpinCaT) Priority Programme of the German Research Foundation (DFG).
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Release time：2017-11-21 00:00 reading：1086 Continue reading>>

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