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According to a report by the Physicist Organization Network on June 15 (Beijing time), recently, engineers from Stanford and the University of Southern California have developed a new method for designing carbon nanotube circuits, which for the first time can produce a carbon nanotube-based method. In the case of full-wafer digital circuits, the entire circuit can still operate even if many nanotubes are twisted and biased.
Carbon nanotubes (CNTs) surpass traditional silicon technologies and are expected to have a tenfold increase in energy efficiency over silicon-based circuits. The first primary nanotube transistor was born in 1998. It is expected that this will open a new era of high energy efficiency and advanced computing equipment. However, due to the inherent shortcomings of carbon nanotubes, this vision has not been realized.
"As a future intensive high-efficiency integrated circuit, carbon nano-transistors are very attractive. However, when people want to use them in the field of microelectronics, they encounter huge obstacles. The most important is their location and electrical properties. Change," said Subradike Gaohua, head of the physical science department at IBM's Thomas Watson Research Center.
Before carbon nanotubes can become a technology with real influence, there are at least two major obstacles to overcome. First, studies have shown that it is impossible to create nanotubes with “perfect†straight lines. Twisting misaligned nanotubes can result in faulty circuits, resulting in functional disruption. Second, there is no technology that can produce completely identical semiconductor nanotubes. If metal carbon nanotubes appear in the circuit, it will cause short circuit, leakage, and fragility. Vulnerable to interference.
In response to these two challenges, the researchers designed a unique "defect-immune" model to produce the first full-wafer-level digital logic device that is immune to carbon nanotube misdirection and positional errors. In addition, they also invented a method that can remove unnecessary elements from the circuit, thus solving the problem of metal carbon nanotubes. Their design method has two outstanding features. First of all, it does not sacrifice the energy efficiency of carbon nanotubes. Second, it can be compatible with existing manufacturing methods and facilities. It is easy to realize commercial applications.
Their research has also recently been used as an "Invited Paper" by the International Electron Devices Conference (IEDM), as well as "Thematic Papers" on computer-aided design of integrated circuits and systems for the IEEE's Institute of Electrical and Electronics Engineers (IEEE).
In the next step, researchers will try to create the basic components of a digital integrated system: computing line and sequence storage, and the first highly integrated 3D integrated circuit. (Reporter Chang Lijun)
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