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Ultra-low cost flexible display in dev't at UNIST

Posted: 29 Jan 2013 ?? ?Print Version ?Bookmark and Share

Keywords:thin film transistors? TDPP? flexible display devices? RFID tags?

A way to make paper-like flexible display devices with a remarkably low cost has been developed by a research team at the Ulsan National Institute of Science and Technology (UNIST). The Polymer-based electronic circuits are expected to open up possibilities for ubiquitous electronics such as flexible displays, RFID tags and large-area sensors.

Circuits made from unipolar semiconductors are high in electricity resistance, and low in mobility and stability. Through a combination of improved semiconducting polymer design and fabrication techniques, progress has been achieved in enhancing the charge carrier mobility of organic thin-film transistors. However, novel ambipolar polymers with better performance and further advances in fabrication processes are still required to truly realise practical organic integrated circuits.

The characteristics of these organic thin film transistors(OTFTs) depend on organic semiconductors. There are two types of polymer-organic semiconductors: ambipolar and unipolar ones, the researchers say.

The research team developed a dithienyl-diketopyrrolopyrrole (TDPP) and selenophene containing polymer with hybrid siloxane-solubilizing groups (PTDPPSe-Si). A synergistic combination of rational polymer backbone design, side-chain dynamics, and solution processing affords an enormous boost in ambipolar TFT performance. The resulting polymer exhibited unprecedentedly high hole and electron mobilities in solution-sheared polymer films. "To the best of our knowledge, these are the highest recorded hole and electron mobilities for organic- or polymer-based ambipolar TFTs reported to date" said the research team.

- Christoph Hammerschmidt
??EE Times Europe

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