Moving the Light - Ambipolar Light-Emitting Polymer Transistors
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Date: 08-18-2006
Start Time:
2:00pm
End Time: 3:00pm
Speaker: Jana Zaumseil
From:
University of Cambridge, UK
Location: 414 Schapiro/CEPSR
Hosted by:
Center for Integrated Science
Since the discovery of their electroluminescent properties, conjugated polymers have been extensively investigated as active materials in light-emitting diodes (LEDs). They can also serve as the semiconducting layer in organic field-effect transistors (FETs) where they show good charge transport characteristics. Ambipolar light-emitting field-effect transistors combine the emission properties of polymer LEDs with the switching behaviour of FETs in a planar structure. Light emission due to the recombination of holes and electrons can then be directly observed within the transistor channel. The position of the narrow emission zone is controlled by the applied voltages and can be varied throughout the entire channel. This vividly visualizes simultaneous hole and electron accumulation in ambipolar FETs and furthermore could enable novel integrated electro-optical devices. This presentation will introduce the prerequisites to achieve ambipolar transport and light emission in polymer field-effect transistors, demonstrate examples for different semiconducting polymers and transistor geometries and show how they can be used to study charge transport and recombination in conjugated polymers.