High Aspect Ratio Silver Conductive Tracks in Inkjet Printing

It's difficult to improve the accuracy and aspect ratio of conductive tracks for the traditional screen printing technology. In order to achieve high aspect ratio of conductive tracks,an ink jet printing method for fabrication of high aspect ratio silver tracks was described. The mechanisms and influence factors of coffee-ring and M-type effect were revealed by experiments. The experiments of multi-pass inkjet printing on Teslin,Kapton,Polycrystalline silicon,glossy photo paper and altering substrates temperature procedure were carried out. The results show that when the substrate temperature is 60 ℃,the arch-type silver tracks are formed. When the substrate temperature is 80 ℃,the optimized aspect ratio of silver tracks is formed and the influence by different substrates is weak. As inkjet printing runs 20 pass,wave form on the edge of silver tracks comes out. When inkjet printing runs 80 pass,wave form fades away and high aspect ratio silver tracks are fabricated instead. When sintering temperature rise to200 ℃,the conductivity of silver tracks is improved greatly. Especially the resistivity on Teslin substrate reduces to the lowest 2. 13 μΩ·cm.