Electronics from the printer

January 5, 2009,
In order for printed electron devices to work, the researchers need to match the properties of the ink and the substrate surface to one another. The untreated insulator (left) is difficult to wet, unlike the surface-treated insulator (right). © Fraunhofer IISB

(PhysOrg.com) -- Electronic systems designed to perform simple functions, such as monitor the temperature on a yogurt pot, mustn’t cost much: This is where printed electronics are at an advantage. Researchers are now significantly improving the properties of printed circuits.

Televisions have changed dramatically: While bulky TV sets dominated our living rooms until just a few years ago, the screens are now so flat that they can easily be hung on the wall. A close look at the inside of these devices will reveal fine conductor paths and transistors that supply the electricity needed to switch the pixels on the screen on and off. These circuits are manufactured layer by layer, usually by photolithography. The materials are deposited onto the entire surface of a substrate and covered with photoresist, which is exposed to light at specific points using a mask.

The exposed photoresist alters its chemical properties: It becomes soluble and can be easily removed. The layer to be structured returns to the surface and can be etched away. However, the parts of the layer still covered with photoresist remain intact. One major disadvantage of this process is that a large fraction of the deposited material is not used. A more cost-efficient and resource-saving method is to deposit the material by printing only in places where it will actually be needed later.

Printed electronics already exist in the form of conductor paths and devices made from polymers. However, their electrical properties cannot compete with those of inorganic materials. The charge carriers in the polymers travel more slowly, with the result that a printed RFID tag, for example, will have a shorter transmission range than a conventional one. Moreover, polymers tend to react more sensitively to moisture and UV light. Researchers at the Fraunhofer Institute of Integrated Systems and Device Technology IISB in Erlangen have now commissioned a process line in which electron devices can be printed from inorganic materials using an ink jet similar to those in any office printer. “We use ink made of nanoparticles and add a stabilizer so that the particles can be easily processed and do not clump together,” says IISB group manager Dr. Michael Jank.

The nano ink has passed the first printing tests and Jank hopes that the researchers will be able to print circuits performing simple functions in about a year’s time. “We expect printed products to cost around 50 percent less than silicon-based ones in the case of simple circuits,” he says. “Printed RFID tags should then be cheap enough to be attached to the packaging of low-cost products such as yogurts, where they can then monitor the temperature, and store and transmit data.”

Provided by Fraunhofer-Gesellschaft

Explore further: MEMS chips get metatlenses

Related Stories

MEMS chips get metatlenses

February 20, 2018

Lens technologies have advanced across all scales, from digital cameras and high bandwidth in fiber optics to the LIGO lab instruments. Now, a new lens technology that could be produced using standard computer-chip technology ...

New method to manufacture organic solar cells

February 5, 2018

The ability to use cheap materials and simple manufacturing methods are two huge advantages of printed organic solar cells. Olle Inganäs, professor at Linköping University, is head of a research group that has now developed ...

Recommended for you

Researchers find tweeting in cities lower than expected

February 20, 2018

Studying data from Twitter, University of Illinois researchers found that less people tweet per capita from larger cities than in smaller ones, indicating an unexpected trend that has implications in understanding urban pace ...

Augmented reality takes 3-D printing to next level

February 20, 2018

Cornell researchers are taking 3-D printing and 3-D modeling to a new level by using augmented reality (AR) to allow designers to design in physical space while a robotic arm rapidly prints the work.

1 comment

Adjust slider to filter visible comments by rank

Display comments: newest first

parker
not rated yet Jan 06, 2009
electronic Printed how is working

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.