U.S. develops defect-free semiconductor nanocrystal film According to the physicist organization network August 21 (Beijing time), researchers at the Massachusetts Institute of Technology used electron beam lithography and stripping process to develop defect-free semiconductor nanocrystal film . This is a promising new material that can be widely used and open up potential key research areas. The relevant report was published in the online version of the recently published "Nano Express" magazine. The size of semiconductor nanocrystals determines their electronic and optical properties. However, it is very difficult to form a thin film with a uniform structure by controlling the arrangement of nanocrystals on the surface. Typical nanocrystalline films generally have cracks that limit their effectiveness, making it impossible for scientific researchers to measure the basic characteristics of these materials. The conductivity of the defect-free film made this time is about 180 times that of the cracked film made by traditional methods. Scientists claim that this manufacturing method can also be applied to the silicon surface to make a 30-nanometer wide film. The trick is to make the thin film structure uniform and tightly adhere to the silica base. This can be achieved by covering the surface with a thin polymer layer before the nanocrystalline layer is deposited on the silicon surface. It is speculated that the tiny organic molecules on the surface of the nanocrystals can also help them combine with the polymer layer. At the initial stage of the research, the nano-film produced by the researchers can emit invisible infrared light. But the work based on this system is very monotonous, because each fine-tuning requires a time-consuming electron microscope inspection. And when successfully obtaining semiconductor nanocrystal patterns that emit visible light, it means that the research team can greatly speed up the development of new technologies. Even if the nanofilm is below the resolution limit of the optical microscope, the nanocrystals can be used as a light source to make them visible. The researchers said that this nanocrystalline film can be used in a variety of applications. Because they can not only emit light, but also absorb multiple colors of light. This helps to form light-emitting pixels on the screen of high-resolution displays, or to make new types of high-efficiency, broad-spectrum solar cells. At the same time, this material can also be used to develop high-sensitivity detectors for a small number of specific biomolecules, such as toxin screening systems or medical testing equipment. In addition, the success of this technology has also opened up new research on how electrons move within nanocrystalline films, which has been regarded as a major problem in the academic world.
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