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WAKE Forest University researchers have developed an organic semiconductor spray paint that can be applied to large surface areas without losing electric conductivity.
Currently, organic thin film transistors are only deposited by one of three methods. Drop casting and spin coating are limited to small area applications, but result in good electrical conductivity.
Organic spray-on techniques can be applied to larger areas, but tend to perform poorly.
According to Oana Jurchescu of the Organic Electronics Group at Wake Forest University, the spray-deposition technology developed in her lab produced the highest performance organic thin film transistors for this method to date.
The conductivity was comparable to that attainable via drop casting and spin coating. However, the spray-deposition technology can be applied over large surfaces, on any medium, from plastic and metal to human skin.
Because of its superb performance and the fact it can be applied over large areas quickly (it is also inexpensive to process compared to inorganic semiconducting materials like silicon), it has the potential to be produced in commercial quantities.
The research can be found in the report titled High Mobility Field-Effect Transistors with Versatile Processing from a Small-Molecule Organic Semiconductor, published 2 April 2013 in the journal Advanced Materials.