Organic Field Effect Transistor

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Definition

Cross section of an organic field effect transistor.

An organic field effect transistor is a field effect transistor that uses an organic semiconductor in its channel. The advantages of using an organic are their low cost, ease of fabrication, especially for complex geometries, and perhaps most importantly for future applications, their flexibility. The most popularly used organic semiconductor for this application is pentacene.

The structure of pentacene, a common organic semiconductor.

Applications

An exciting application to OFETs is their optical properties that can be used for visual displays. OFETS can carry charges and conduct electron, thus it can be used as a light emitting device. The first light emitting field effect transistor was fabricated in 2003 by a german group. They used a polycrystalline tetracine thin film bridge between a gold electrodes that acted as the electron source and sink. When electrons and holes are injected into this OFET, electroluminescence occurs in the organic bridge.

Future

As stated earlier the light emitting effects coupled with an OFETs flexibility are of the most interest to current scientists. General Electric (GE) has invested in a project to create OFETs for roll to roll wallpaper to be used as indoor lighting. Also, clothing made with OFETs could be worn that display different images depending on what the wearer chooses. Furthermore, OFET paper with countless pixels that could light up when it is touched with a stylus could be a future means of communication, expression, and art. Finally, biological and chemical sensing, along with the medical field may be able to use OFETs as a type of 'electronic nose' as they are a coupling of chemical and electronic information.

References

http://www.rsc.org/Publishing/ChemTech/Volume/2008/04/organic_transistors.asp