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Organic field-effect transistors

Rodriguez Yebra, M.d.-M.; (2009) Organic field-effect transistors. Masters thesis , UCL (University College London).

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Abstract

Electronic devices based on organic materials are increasingly becoming groundwork of semiconductor technology. Organic materials are currently recognized as promising in general because of their interesting properties in the solid state, such as electrical, optical, photoelectrical or magnetic properties. Moreover, there are more reasons for the application of organic materials, for example low cost manufacturing, solution processability or advantages for large-scale applications (such as scanners or displays). Organic materials can be the next generation of electronic applications, such as solar cells, vapor sensors, nanoscale lasers, phototransistors or the active layer for organic field-effect transistor (OFETs). OFET-based circuits are of particular interest because of their wide range of applications where high speeds are not critical, such as flexible electronics. Nevertheless, OFETs are not only interesting for their electronic applications but also because we can use them to study charge transport in different materials. For a long time now, it has been a lot of the effort aimed to improve carrier transport and emission properties in organic materials, focusing in the study of their physical and chemical characteristics and device fabrication. In this dissertation, the main focus will be in the review of organic semiconductors and organic field-effect transistors. I will dedicate one chapter to review the main characteristics of organic semiconductors, with more emphasis in polymer semiconductors, the different electronic processes (injection, charge transport, trapping and recombination techniques) as well as the experimental techniques employed to measure mobility. Another chapter will be fully dedicated to OFETs, their history, types of transistors and working principles. Moreover, I will talk about the different materials used to fabricate transistors with the most recent results reported for mobilities and the methods employed in the fabrication of organic transistors. Finally, there will be two chapters on my experimental work, where nanofabrication techniques, device setup and transistor characterization will be analyzed.

Type: Thesis (Masters)
Title: Organic field-effect transistors
Language: English
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/18927
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