2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Polyvinyl Alcohol (PVA)/Layered Silicate Nanocomposite Approaches for Organic Passivation Layers in Organic Thin Film Transistors

T. Ahn, H.J. Suk and M.Y. Yi
Korea Reserch Institute of Chemical Technology, KR

Keywords:
layered silicate nanocomposite, organic passivation, organic thin film transistor

Abstract:
Organic thin-film transistors (OTFTs) have been demonstrated as promising candidates for flexible displays, smart cards (badges), and gas sensors. These applications with organic electronics offer many advantages, such as light weight, low cost processing, and mechanical flexibility. On the other hand, organic devices also have some significant shortcomings, such as relative low mobility and performance degradation due to moisture (H2O) and oxygen (O2). Most of researches have been focused on the mobility improvement and now the mobility of OTFT is almost the same as that of amorphous silicon thin-film transistor (TFT) or even higher. However to realize the real array device such as active matrix display, the passivation of OTFT is the most important process, especially by solution processable materials for all organic devices. Unfortunately there are not so many candidates for organic passivation because organic passivation solution can damage the OTFT device such as organic semiconductor. Most frequently used organic material for OTFT passivation is polyvinyl alcohol (PVA) in water to be safe to organic semiconductor layer by the effect of large difference of surface energy. In our works, we have tried the modification of PVA passivation layer by nanocomposite approach with synthetic smectite clays to improve the barrier property of PVA layer to oxygen and moisture.

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