2021-07-22

The next generation of touch screen materials has an “indium-free solution”

By yqqlm yqqlm

They developed a new method of using plasma technology to make indium-free transparent conductive films. The new film can be flexibly manipulated, the production process consumes low power and is environmentally friendly. Related research was published on the 19th in the “Solar Materials and Solar Cells” magazine.

The next generation of touch screen materials has an “indium-free solution”

The new touch screen film invented does not contain Plasma, but the manufacturing process uses plasma technology, which is a new tungsten oxide deposition method called HiPIMS. Through this method, researchers have developed a nanocomposite material composed of tungsten oxide and silver, allowing electrochromic devices to efficiently and quickly change colors according to user needs.

Using a process called “plasma sputtering”, researchers made a new type of ultra-thin “sandwich” material on glass-a layer of ultra-thin silver sandwiched between two layers of oxidation Between tungsten. The thickness of this structure is less than 100 nanometers, which is about one thousandth of the width of a human hair.

During the production process, the researchers placed a mixture of argon and oxygen in a strong electric field until the mixture turned into a plasma state. The plasma is used to bombard a solid tungsten target, separating atoms from it and depositing them as an ultra-thin layer on the glass surface.

Next, the researchers repeated the process with metallic silver, and finally used tungsten oxide embedded with silver nanoparticles for the third time. The whole process only takes a few minutes, produces very little waste, and is cheaper than using indium. The resulting film can be used on any glass surface, such as mobile phone screens or windows.

The finished plasma film is electrochromic, which is different from color-changing glasses that react to ambient light. If voltage is applied to the film, its transparency and color can be changed.

Benan Akavan, a researcher at the School of Biomedical Engineering and the School of Physics at the University of Sydney, said: “Smart windows coated with new plasma films can be used to block light and heat as needed. It can also be applied to any The glass surface is set to adjust the transparency according to the outdoor weather.”

The researchers said that this new indium-free technology is used in the manufacture of next-generation touch screen devices (such as smart phones or electronic paper), or for environmentally friendly use. In terms of smart windows and solar cells, both have great potential. Currently, this technology is ready to open up a larger-scale commercial path. And their next goal is to make it suitable for future wearable electronic devices.