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wooden chip

06.06.2015

Researchers at the University of Wisconsin-Madison and the US Department of Agriculture have developed a chip that uses cellulose, a substance obtained by processing wood (cellulose is also used to make paper), on a substrate that houses semiconductor transistors.

According to the project leader, professor of electrical engineering Zhenqiang Ma (Zhenqiang Ma), the substrate in the chip accounts for the bulk of the material. So the researchers are talking about developing a chip "virtually entirely made of wood."

Cellulose fibers, which the researchers managed to obtain, have the necessary strength to accommodate transistors. However, the surface of the material is not flat enough for this purpose. Moreover, cellulose well absorbs moisture from the surrounding air and as a result swells - which will certainly lead to the destruction of the microcircuit.

In order to make cellulose suitable for use as a substrate, the research team applied an epoxy composition to it. This helped to solve both problems at once - both the problem of uneven surface and the problem of swelling, said Ma.

"The main advantage of cellulose fiber over polymers is that it is made from plant materials, while most other polymers are made from petroleum products. Biopolymers are safer for the environment, they rot quickly and are easily recycled," the project leader explained.

In addition to using the new material as a substrate in a chip, the researchers demonstrated a way to place a much larger number of transistors on a cellulose substrate compared to traditional semiconductor industry technologies.

In particular, on a substrate with an area of 30 sq. m, the researchers were able to place 1,5 thousand transistors made of gallium arsenide, while usually only eight to 40 transistors are placed on such an area. According to the project participants, this method can significantly reduce the amount of toxic electronic waste accumulated on Earth.

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