Japan develops 3D curved printed circuit

Professor Shizuru Shishi, deputy director of Yamagata University's Organic Electronics Research Center (ROEL), delivered a speech at the "Thinking the Future of Organic Electronics" seminar on July 11, 2014, introducing the technology group being developed by the research team he led. Among them, Shi Ren specifically mentioned the "3D-PE technology" (3D-PE) that directly printed circuits on curved surfaces, saying that "no one else has been involved in this kind of technology yet."

At that time, he disclosed the characteristics of silver (Ag) nano inks patented by Yamagata University, which can be sintered at low temperature, and copper (Cu) nano inks.

After coating, the silver nano-ink is dried for several hours at room temperature, and the conductivity drops to about 200 μΩcm. After firing at a temperature of 100 ° C, the conductivity can be reduced to 6μΩcm, and firing at a temperature of 120 ° C can be reduced to 3μΩcm.

In the field of copper nano-ink, the research group of Shiren and Ishihara Chemical jointly developed the thermal sintering technology under nitrogen environment. After sintering at a temperature of 300 ℃, the conductivity dropped to about 100μΩcm. Sintering at 350 ℃ reduced the conductivity to about 18μΩcm. The conductivity of the copper block is 1.7 μΩcm.

In addition, Shi Ren also developed the photonic sintering technology of copper nano-ink with Ishihara Chemical. It is only necessary to irradiate 6000J of light in an extremely short time of 0.8ms in the atmospheric environment to reduce the conductivity of copper wiring to 9μΩcm.

In the past, when inkjet technology was used to form electrodes and wiring using silver or copper nano-inks, a "coffee stain effect" was generated, that is, the surroundings and edges of the wiring and electrodes appeared bulging. The technology developed by the then research group can also solve this problem.

The specific method is to use water as a solvent, a temperature of 30 ° C and a relative humidity of 85-90% to dry the ink, and the cross section of the wiring will form a mesa shape or a raised hill shape in the center, thereby eliminating the coffee stain effect. After sintering at a relative humidity of 85-90% and a temperature of 140 ° C, the conductivity is about 30 μΩcm.

Regarding the 3D-PE technology, the printing method was not disclosed this time, but it is said that the silver nano ink can be directly printed on the curved surface. The wiring width can be up to 20μm, and it can also be printed on curved surfaces such as cylinders.

It is envisaged for instruments around the driver's seat of the car, touch panels installed on the operation panel (dashboard), wiring in the car's interior, and antennas on the curved casing. Professor Shi Ren said, "This is not possible with the original lithography process."

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