The researchers printed and demonstrated organic transistors that are capable of operating at almost the limit of their theoretical capabilities without requiring high voltage, thus reducing energy consumption. These transistors can be used to produce flexible and flexible displays.
For the past ten years, displays for smartphones or computers have been manufactured using thin film transistor technology. These inorganic devices consume very little power and have proven their effectiveness. But they also have limitations that scientists at the University of Tokyo have tried to overcome, Science Daily reports.
They have turned to organic thin-film transistors – not a new idea, but no successful method of printing such devices has been proposed so far. Professor Tatsuo Hasegawa and his team found a way to print organic semiconductor film – the main element of such transistors – on a special lyophobic surface that weakly interacts with fluids. This means that the surface will repel the materials required to print the transistor structure.
Scientists have used the lyophobic properties of the coating, which can be observed on my hands with soap. Soap bubbles can retain their shape, reducing the surface tension of the fluid. It is assumed that such a mechanism will be effective in forming a thin liquid layer on the lyophilic surface. It can be used to form and grow semiconducting film in the printing process.
“After a series of trial and error experiments, we finally realized that using a special U-shaped metal film template is effective for uniform film growth due to its ability to form a thin liquid layer on a lyophilic surface,” said one of the researchers, Gio Kitahara.