Polymer Gate Dielectrics

Besides the general insulating properties of insulating materials, chemical and thermal stability is required and excellent film-forming properties and methods for patterning the insulating layer. Therefore, the most common polymers (e.g. polyethylene, polypropylene, polyvinylchloride etc.) have not yet been used as gate-dielectric layers. 

Multi-layer and Multi-component Cate Dielectrics 

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Klauk H, Halik M, Zschieschang U, Schmid G, Radlik W, Weber W (2002) High-mobility polymer gate dielectric pentacene thin film transistors. J Appl Phys 92(9) 5259-5263... 

Pentacene routinely yields field-effect transistor (FET) devices with reliable hole mobility of 1 cm2 V-1 s 1 [6], with mobility > 3 cm2 V-1 s-1 reported for thin-film devices on polymer gate dielectrics [9]. For transistors fabricated on single crystals of pentacene, the measured mobility approaches 60 cm2 V-1 s 1 [10]. 

H. Klauk, M. Halik, U. Zschieschang, G. Schmid, W. Radlik, and W. Weher, High-mohility polymer gate dielectric pentacene thin film transistors, J. Appl. Phys. 92(9), 5259-5263 (2002). 

Table 18.2 Different investigated polymer gate dielectrics.

Klauk, H. et al., High-mobihty polymer gate dielectric pentacene thin film transistors,... 

Granstrom, J. and Katz, H.E., Pentacene transistors with polymer gate dielectrics on metallized optical fibers, J. Mater. Res. 19 (12), 3540-3546, 2004. 

M. Halik et al.. Polymer gate dielectric and conducting-polymer contacts for high-performance organic thin-fikn transistors, Arfv. Mater, 14, 1717, 2002. 

The situation with OTFTs is unclear. Our studies have shown that on-state bias stress instability in pentaeene OTFTs is somewhat worse than in a-Si TFTs and the off-state instability is mueh worse. The off-state instability is partieularly troubling, since a pixel switeh is usually in the off state. However, other organic semiconductors show much less instability. Polymer gate dielectrics are seeing increasing use in... 

Guo TF, Tsai ZJ, Chen SY, Wen TC, Chung CT (2007) Influence of polymer gate dielectrics on n-channel conduction of pentacene-based organic field-effect transistors. J Appl Phys 101 124505... 

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