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Contribution à l'élaboration de composants électroniques organiques à base de poly(3-octylthiophène)

Abstract : The work presented in this manuscript relates to the study and the realization of diodes and transistors with polymeric active layers. The polymer used for this study is a regioregular poly (3-octylthiophene) synthesized by Mr. Delabouglise from the Laboratory of electrochemistry and physicochemistry of materials and interfaces (LEPMI).
The first chapter constitutes a rather exhaustive review of the literature in the field. We detailed the principles of conduction in organic materials by pointing out the importance of molecular orbitals in the charges transport. This state of the art also consisted in making an inventory of principal organic materials referred in the literature and to compare their performances. The continuation of the manuscript gives a report on realization and characterization of the diodes based on P3OT. The 2nd chapter describes the various technological stages of the diodes achievement. They are based on the principle of a P3OT layer sandwiched between an anode as ITO and a metal cathode. We identified by using the diodes electric characteristics the models most adapted to the description of their behaviour. A capacitive study in particular made it possible to reveal the presence of a space charge at the metal/polymeric interface.
The 3rd chapter approaches the realization of thin film transistors containing P3OT. We extracted from the characterization of these components a field effect mobility 4,1.10-5 cm². V-1.s-1. We also put forward the mobility increase according to the grid voltage. The important presence of traps at the SiO2/P3OT interface or in the volume of material was highlighted. The ageing of our transistors was also approached, in particular during their exposure to oxygen.
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  • HAL Id : tel-00131179, version 1

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Jérôme Ballet. Contribution à l'élaboration de composants électroniques organiques à base de poly(3-octylthiophène). Micro et nanotechnologies/Microélectronique. Université Paul Sabatier - Toulouse III, 2006. Français. ⟨tel-00131179⟩

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