Yu Kobayashi

Fine patterning method for silver nanoparticle electrodes using differential hydrophobic and hydrophilic surface properties

Using a simple spin-coating process, we have demonstrated a fine patterning method for silver nanoparticle ink by combining hydrophobic and hydrophilic substrate surface properties. The hydrophobic/hydrophilic treated areas were precisely formed on a glass substrate by employing a hydrophobic photoresist and a hydrophilic polymer with a conventional photolithographic patterning process. Using this technique, fine silver electrodes with spaces of 5 µm were successfully formed. We applied this method to the short-channel source/drain electrodes in organic thin-film transistor (TFT) devices and succeeded in fabricating a TFT electrode array with a resolution of 100 ppi. The short-channel pentacene TFT with silver nanoparticle electrodes showed good electrical characteristics with high yields and no hysteresis.

Fine Patterning Method for Silver Nanoparticle Electrodes Using Difference of Hydrophilic and Hydrophobic Surface Properties

By using a UV curable hydrophobic photoresist, short channel silver nanoparticle electrodes (less than 10 μm) were successfully formed by simple spin-coating process. The channel length was varied with a photomask, and we succeeded in a fabrication of a 100 ppi electrode array. This method was applied to source/drain electrodes of organic thin-film transistor, and a mobility of 0.03 cm 2 /Vs and on/off ratio of 10 6