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Sketch of nanowalls
A schematic diagram of the use of gold wiring to make a grid-like transparent electrode has a wiring width of 300 nm
Researchers at the Swiss Federal Institute of Technology in Zurich (ETH Zurich) used silver (Ag) or gold (Au) nanoparticles to form transparent electrodes on glass substrates, achieving unprecedented high light transmittance and low square resistance values. Related papers have been published in academic journals (links to papers). The light transmittance was 94% and the sheet resistance was 8Ω/□.
The method for realizing such a transparent electrode is that the researchers use the 3D printing technology to repeatedly draw the original wire-like wiring in the same place so that it can accumulate a certain height to form a wall. The wiring width is very fine, only 80 nm to 500 nm, and the resistance value is successfully reduced while preventing the light transmittance from decreasing. Dimos Poulikakos, a professor at ETH Zurich responsible for the development, called the wiring "nanowall" instead of nanowire. The height of a "wall" is 2 to 4 times its width.
The technical focus this time is on the improvement of inkjet technology. On the inkjet nozzle, a self-developed glass capillary was installed to reduce the diameter of the droplet “NanoDrip†to 1/10 of the nozzle diameter. Therefore, after the silver or gold nano ink droplets are ejected, they will dry before reaching the glass. By repeating this process, you can increase the height without increasing the wiring width. (Reporter: Nozawa Tetsuo)
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