Afshin Dadvand

PHD Student

Université du Québec
Institut national de la recherche scientifique
Énergie, Matériaux et Télécommunications
1650, boulevard Lionel-Boulet
Varennes, Québec, Canada
J3X 1S2

Telephone: +1 (514) 228-6936
Fax: +1 (450) 929-8102
dadvand@emt.inrs.ca
www.emt.inrs.ca

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Design and fabrication of multifunctional Organic Field Effect Transistors (OFETs)
Organic semiconductors (OSC) are an important class of functional materials due to their use in electronic and optoelectronic devices such as light-emitting devices (LEDs), field-effect transistors (FETs), photovoltaic cells, etc. While the charge carrier mobilities achieved for some OSCs already rival that of amorphous silicon, the long term operational and storage stability, which is inherently linked to molecular structure, still limits the wide implementation of OFETs. Therefore, the design of new stable organic semiconducting materials is of great practical interest.

In this project and in collaboration with synthetic chemists from Dr. Perepichka’s group, we will be working on the design, fabrication and characterization of multifunctional electronic devices based on organic materials. Along the typical switching function of OFETs, we focus on other applications where OFETs can have electroluminescence properties as well as transducing properties such as non-volatile transistor effect and/or a chemical sensor in which species adsorbed onto the semiconductor alter the output current of an OFET. In this work, OFETs will be generally fabricated on thermally oxidized silicon surfaces to provide a convenient substrate, gate contact, and smooth gate insulator for processing and characterization. However, we will try to use a ferroelectric material with perovskite structure (BaTiO3) as a gate insulator material to study the possible memory effects in OFETs.