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Two-dimensional semiconductors and liquid metals are saving Moore's law of semiconductors

wallpapers News 2020-10-10
These two-dimensional materials are so thin that they can allow free charge carriers, namely electrons and holes in information-carrying transistors, to travel along the ultra-thin plane. These charge bodies can switch semiconductors very easily. It also allows the charge carrier's directional path to move without scattering, causing the transistor's resistance to being infinitely small.

This means that in theory, two-dimensional materials can cause the transistor not to waste energy when switching on/off. In view, they can be switched very quickly, and can also be turned off to an absolute zero resistance value in a non-operating state. This sounds ideal, but there are many technical obstacles to creating such a perfect ultra-thin semiconductor. One of the current technological barriers is that the deposited ultra-thin film fills the grain boundaries, causing the charge carriers to bounce back from it, so the resistance loss increases.

One of the most exciting ultra-thin semiconductors is molybdenum disulfide (MoS2), the subject of research for the past two decades due to its electronic properties. However, it turns out that obtaining super-large two-dimensional MoS2 without any grain boundaries is a real challenge. Using any current large-scale deposition technology, an acceptable level of maturity has been reached, and MoS2 without grain boundaries is essential for IC manufacturing. However, researchers have now developed a method based on a new deposition method to eliminate this grain boundary.
This unique function is realized with the help of liquid metal gallium. Gallium is a fantastic metal with a melting point of only 29.8 degrees Celsius. This means that it is stable at average office temperature but will become liquid when placed on the palm. It is molten metal, so its atomic surface is smooth. It is also a conventional metal, which means that its surface provides many free electrons to promote chemical reactions.

By bringing the source of molybdenum and sulfur to the vicinity of the gallium liquid metal's surface, the chemical reaction of forming the molybdenum-sulfur bond can be realized, thereby establishing the required MoS2. The resulting two-dimensional material is templated onto an atomically smooth surface. Gallium so it is naturally nucleated and has no grain boundaries. This means that through the second annealing step, a substantial MoS2 area can be obtained without grain boundaries, which is crucial for expanding this magnetic super smooth semiconductor.
 
2D transition metal-carbon disulfide (TMD) is playing an increasingly important role in research and future optoelectronics. However, due to sparse nucleation and dependence on the substrate, the large-scale deposition of two-dimensional TMD is still challenging. Liquid metals can provide practical solutions to these challenges due to their reactive, non-polarization and template properties.

The researchers demonstrated the auto deposition of 2D molybdenum sulfide by introducing a molybdenum precursor into the surface of a eutectic alloy of gallium and indium (again). Again is used as an ultra-smooth template and reducing agent for the precursor to form large-scale planar molybdenum sulfide, which can be transferred to any substrate. Molybdenum sulfide forms spontaneously on the surface of EGaIn, which has sufficient potential to drive the cathodic reaction of the deposition process. After the final annealing step, highly crystalline 2H-MoS2 was obtained. This work demonstrates the fundamental formation of new features of large-scale 2D TMD.

This method may be extended to the manufacture of other two-dimensional semiconductor and dielectric materials to produce many materials that can be used as different parts of transistors.
 
Luoyang Trunnano Tech Co., Ltd (TRUNNANO) is a professional molybdenum disulfide with over 12 years experience in chemical products research and development. If you are looking for high quality molybdenum disulfide, please feel free to contact us and send an inquiry.

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Tag: molybdenum