According to the report of the American Physicists Organization Network on February 17 (Beijing time), recently, scientists have developed a new type of carbon nanotubes with an optimal balance between metallicity and semiconductivity, and used this nanotube to create a thin film Transistor (TFT) is expected to develop high-performance, transparent and flexible devices such as e-books and electronic tags in the future.
Sun Dongming, a scientist at Nagoya University in Japan, and his colleagues, as well as scientists at Aalto University in Finland, in the latest issue of "Nature · Nanotechnology" magazine, introduced the use of this new carbon nanotube manufacturing thin film transistors and flexible integrated circuits.
The electronic properties of carbon nanotubes can be divided into two types: metallic and semiconducting, and the carbon nanotubes of these two properties "stick" to each other into a rope or a bundle. At this time, metallicity is stronger than semiconducting, but only semiconductor Only nanotubes can be used as transistors, which makes the use of carbon nanotubes greatly reduced. Although metallicity can increase the ability of transistor charge carriers to move, it can also reduce the switching frequency of the transistor.
In the latest research, scientists have developed a new method of manufacturing carbon nanotubes, which optimizes the balance between the metallicity and semiconductority of nanotubes. The new nanotube network contains straight, relatively long (10 micron) nanotubes (30% of which are metal), and the nanotubes of the new network have more Y-shaped interfaces than X-shaped interfaces, and their resistance is more low.
Scientists have used this new nanotube network to fabricate thin film transistors. Compared with previous nanotransistors, the new transistors have a high charge carrier movement capability and high switching frequency. The researchers said that the high movement ability is mainly due to the unique shape of the nanotube network; the high switching frequency is due to the construction process that can control the density of the metal nanotubes, making it lower in density.
Scientists have also made integrated circuits that can handle sequential logic, which is the first sequential logic integrated circuit based on carbon nanotubes. In this circuit, the output value depends not only on the current input value, but also on the historical input value, which gives it storage or memory capabilities.
Co-author of the study, Professor Naoya Ono said that by scaling up the manufacturing process and using improved printing technology, scientists can use these nanotube-based thin-film transistors to manufacture inexpensive flexible electronic products, such as smart phones and E-paper etc. And is expected to achieve commercial production within 5 years.
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