Analysis and modelling of charge transport properties in organic field-effect transistors

  • Printed organic electronics for flexible, low-cost and large-area applications require solution-processable semiconductors with sufficiently high performance. Many of these soluble semiconductors are organic polymers. Charge transport mechanisms in these disordered systems differ from those in crystalline semiconductors, and various models exist for their description. In this work, top-gate organic field-effect transistors (OFETs) on flexible and transparent plastic foil substrates with solution-processed organic gate insulator are used to investigate on charge transport features in the widely used poly-thiophene P3HT (poly(3-hexyl thiophene)). In addition to standard transistor parameters such as charge carrier mobility and threshold voltage, the modeling takes into account features like bulk current and the charge carrier density dependence of the mobility. These parameters are analyzed upon their variation with temperature, semiconductor layer thickness or changes in the composure of the insulator and its solvent, in order to achieve a comprehensive description. In addition, a model is elaborated and experimentally verified that predicts, from the charge carrier mobility and the contact resistance as well as the parasitic capacitances, the maximum frequency of an OFET, a crucial parameter for any application. Having been realized in the frame of an industrial cooperation aiming for suitable materials for printed electronics, the thesis includes the implementation of a high-quality material test and analysis setup, with which different semiconductor/insulator systems are evaluated, also with respect to the parameters found to be crucial in the modeling section, with the goal of achieving not only high mobility for good on-current, but also suitable threshold voltage and bulk conductivity for low off-current.

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Publishing Institution:IRC-Library, Information Resource Center der Jacobs University Bremen
Granting Institution:Jacobs Univ.
Author:Benedikt Gburek
Referee:Veit Wagner, Dietmar Knipp, Jean Geurts
Advisor:Veit Wagner
Persistent Identifier (URN):urn:nbn:de:101:1-2013052411350
Document Type:PhD Thesis
Date of Successful Oral Defense:2010/04/30
Date of First Publication:2010/05/12
PhD Degree:Physics
School:SES School of Engineering and Science
Library of Congress Classification:Q Science / QC Physics / QC501-766 Electricity and magnetism / QC501-721 Electricity / QC601-625 Electric current / QC610.3-QC612 Electric conductivity / QC610.9-611.8 Semiconductor physics / QC611.8 Specific semiconducting substances and types, A-Z / QC611.8.O7 Organic substances
Call No:Thesis 2010/6

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