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Soft and flexible thin-film transistor backplane materials can be used to develop smart plastic electronic devices in the future.
According to foreign media reports, U.S. researchers successfully developed a soft and elastic “electronic skin†using carbon nanotube solution. The electronic skin sensor can sense the touch, and the sensitivity is three times that of the previous nanowire-based electronic skin. This technology will enable scientists to produce soft and flexible smart plastic electronic devices at a low cost in the future.
Many industries want to create soft and flexible electronic products, but to make such devices, first there must be a suitable backplane. If the electronic circuit is imprinted on a flexible and flexible backplane, it will revolutionize some industries and make "smart devices" everywhere. Among the applications that have been envisioned include food packaging that can detect spoilage; medical bandages that can treat infections; paints that can monitor surface cracks and other structural damage; electronic screens that can fold like paper; from solar energy to pacemakers To clothing, these smart applications are the so-called "plastic electronics": soft and elastic. A suitable floor must be mass-produced in a cost-effective manner.
Researchers at the US Department of Energy's Lawrence Berkeley National Laboratory have developed a new viable technology that can produce flexible backplanes on a large scale at a low cost. The new technology utilizes a semiconductor-concentrated carbon nanotube solution to produce a thin-film transistor network with excellent electrical properties. The researchers used a solution of 99% semiconducting single-walled carbon nanotubes as a substrate, combined with a highly elastic polyimide polymer as a substrate, and the substrate was laser-cut into a hexagonal honeycomb pattern with a side length of 3.3 mm. The silicon and aluminum oxide layers are then deposited on the substrate and the base plate is made. To prove the effectiveness of their carbon nanotube substrates, the researchers also created an electronic skin sensor that felt the touch.
Ali Javey, a professor of electrical engineering and computer science at the University of California, Berkeley, said: "We have developed a flexible, flexible base plate that will completely cover the highly passivated, highly uniform thin-film transistor arrays at approximately 56. On the square centimeter base plate, this technology is combined with metal ink jet printing to produce flexible, flexible electronic devices at low cost in the future."
With the increase in the demand for plastic electronic products, research and development in this area have been in full swing for the past 10 years. Single-walled carbon nanotubes emerged as the top semiconductor materials for plastic electronic products, mainly because they have highly mobile electrons and can measure how fast a semiconductor conducts electricity. However, single-walled carbon nanotubes can take the form of semiconductors or metals. A typical single-walled carbon nanotube includes two-thirds of a semiconductor and one-third of a metal tube. This hybrid-produced nanotube network shows a relatively low on/off ratio, which has become a major issue in the field of electronic applications. Takahashi, the lead author of the research report, said: “In electronic devices, the higher the ratio of on/off current is, the better the pixel size of the sensor is, and the 99% of high purity provides up to 100 on/off current ratio."
In order to develop the bottom plate, the research team used a solution of single-walled carbon nanotubes. High-strength polymers have excellent flexibility, laser-cut substrates, and stretchable hexagonal honeycomb patterns. Takahas said: "The substrate can be stretched to a certain extent by 60%. In the future, the degree of extensibility and directionality should be changed by changing the size of the hole or by optimizing the adjustable parameters of the mesh design." The single-walled carbon nanotube thin film transistor backplane was used to create electronic skin. The electronic skin is composed of 96 sensor pixel arrays. Each pixel is controlled by a single thin film transistor and can sense the spatial pressure distribution in a 24 cm2 range. The electronic skin can detect 0-15 kPa pressure.
Takahas said: "The sensitivity of the electronic skin is three times higher than that of the nanowire electronic skin sensor developed by the laboratory last year. This is because of the increased sensitivity of single-walled carbon nanotube devices. In the future, we should be able to increase Our backplane technology, by adding various sensors or other functional components to expand the application of this backplane, is expected to develop versatile artificial skin. In addition, the soleplate of single-walled carbon nanotubes can be used to develop flexible displays."
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