A group of researchers from the University of Tokyo recently published a paper on a new method of printing thin-film transistors from organic semiconductor materials (OSC). It is claimed that the elements of the technical process have been developed, during the implementation of which low-power transistors with the highest switching speed for organic materials are obtained. Opening can lead to lightweight and flexible displays with excellent performance.
The idea that the Japanese scientist came up with borders on a paradox. In the process of growing thin semiconductor films, the researchers combined liquid materials and a lyophobic base. In other words, the liquid ingredients repelled and did not bind to the base. This combination has an interesting effect.
Liquid solutions with organic materials that were supposed to turn into a solid semiconductor film – part of future thin-film transistors – were evenly distributed over a vast surface due to the action of repulsive forces and surface tension. The distribution was so uniform (which was also helped by special devices and a U-shaped border made of metal foil on the substrate) that the process of growing transistors (layers) went evenly over the entire substrate.
Experiments with the resulting transistors have shown that very low voltage is required to operate at high speeds, which will reduce the power consumption of such arrays. The switching speed reached the theoretical capabilities of organic semiconductor materials, which is very encouraging. On the basis of such TF-transistors, it will be possible to produce flexible and foldable displays on liquid crystals or electronic ink, or maybe something else new and unusual.
“We used the flow property that you probably see every time you wash your hands with soap and water.Professor Kitahara said. – Soap bubbles can maintain their shape by reducing the surface tension of the liquid. We believed that the soap film mechanism should be effective for the formation of a thin liquid layer on lyophobic surfaces, despite the repulsive forces. Solid semiconductor films can be formed and grown by forming thin liquid layers during printing. “…
Research data published in Science Advances. Scientists did not give recommendations for direct commercial use of the experience.
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