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Design, Fabrication and Characterization of MultifunctionalField-Effect Transistors (FETs) based on novel n-conjugated organic semiconductors.

Dadvand, Afshin (2012). Design, Fabrication and Characterization of MultifunctionalField-Effect Transistors (FETs) based on novel n-conjugated organic semiconductors. Thèse. Université du Québec, Institut national de la recherche scientifique, Doctorat en sciences de l'énergie et des matériaux, 140 p.

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Résumé

For over 50 years the mainstream electronics industry has been dominated by thin film transistors based on inorganic semiconductors such as silicon and gallium arsenide. The fabrication of these devices requires high temperature and high vacuum deposition techniques that result in high production costs, which are particularly prohibitive for large-area electronics. Organic semiconductors (OSCs) offer an attractive alternative since their fabrication processes are much less complex compared to conventional inorganic technology. In particular, low temperature deposition and solution processing techniques provide a simple, low cost alternative. π-Conjugated organic semiconductors are therefore attracting considerable attention for applications such as organic light-emitting diodes (OLEDs), field-effect transistors (OFETs) and photovoltaic cells. Furthermore, the mechanical properties (flexibility) of organic compounds coupled with their low temperature solution-based processing provides the potential for new applications inc1uding flexible displays, pliable electronic paper and smart cards. While molecular and polymer OLEDs have already been commercialized in a number of consumer products, OLED displays still employ an inorganic (amorphous silicon, a-Si) thin-film transistor (TFT) matrix to control the emissive pixels. Organic TFTs (OTFTs) are nevertheless extensively investigated by numerous, both industrial and academic, research groups. The mobility of the best OSCs have already approached and even surpassed that of a-Si (~1 cm² V/s). However, the limited stability of OSCs and the "difficult to control" molecular packing, particularly in solution-processed devices, are among the major limitations hampering industrial development, and the design of new OSCs continues to be an important area of materials research. This project involves elaboration of the thin film technology of new organic semiconducting materials, inc1uding small molecules (fused polyaromatic systems and heterocyc1ic oligomers, mainly fused thiophene and selenophene derivatives) and polymers, and characterization of their electronic properties for applications in optoelectronic devices. A large emphasis of this project is the study of new organic materials as an active semiconducting layer in transistors. Along the typical switching function of OTFTs, the research is directed to the design, fabrication and characterization of multifunctional transistors that can have electroluminescence and possible lasing properties.

Type de document: Thèse
Directeur de mémoire/thèse: Rosei , Federico
Co-directeurs de mémoire/thèse: Perepichka, Dmitrii F.
Mots-clés libres: organique; semi-conducteurs; FETs
Centre: Centre Énergie Matériaux Télécommunications
Date de dépôt: 22 janv. 2013 16:37
Dernière modification: 16 déc. 2015 22:01
URI: http://espace.inrs.ca/id/eprint/718

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