The researchers used a cellulose material for the substrate of the chip, which is the part that supports the active semiconductor layer. Taken from cellulose, a naturally abundant substance used to make paper, cellulose nanofibril (CNF) is a flexible, transparent and sturdy material with suitable electrical properties.

Source: Computer chips made of wood promise greener electronics

In a conventional chip, the support substrate is made of the same material as the active layer, but in the CNF chip, only the active layer is semiconductor material