By Gary Thomas
A collaborative study conducted by the Organic Electronics Research Group at Linköping University (LiU) in Sweden has revealed that transistors designed using plastic can be controlled with high accuracy. The scientists from the Group worked together with a research team at the Université Paris Diderot in Paris 7.
The Organic Electronics Research Group attracted more attention, when Lars Herlogsson’s doctoral thesis showed that it was possible to design completely functional field-effect transistors using plastic. At present, Loïg Kergoat from the Group has shown that transistors made from plastic can be precisely controlled.
If a transistor needs to be used in a logic circuit, it is necessary to define the threshold voltage, where the component shifts from off to on or from zero to one. Kergoat’s research revealed that by altering the material used on the gate electrode, the threshold voltage can be shifted slowly. For example, by altering the gold electrode material to calcium, the threshold voltage is decreased as much as 0.9V.
Kergoat stated that transistors constructed from organic electronics must be controlled with weak voltages,close to zero. This allows accurate control of one of the key properties of transistors, which is major advantage in fabricating different types of circuits, remarked Professor Magnus Berggren, who leads the Organic Electronics Research Group.