Rega, Romina (2014) OTFTs FOR ELECTRONIC SYSTEMS:DEVICES FABRICATION, CHARACTERISATION, ANALYSIS AND RELIABILITY. [Tesi di dottorato]

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Item Type: Tesi di dottorato
Lingua: English
Title: OTFTs FOR ELECTRONIC SYSTEMS:DEVICES FABRICATION, CHARACTERISATION, ANALYSIS AND RELIABILITY
Creators:
CreatorsEmail
Rega, Rominaregaromina@gmail.com
Date: 31 March 2014
Number of Pages: 153
Institution: Università degli Studi di Napoli Federico II
Department: Fisica
Scuola di dottorato: Ingegneria industriale
Dottorato: Tecnologie innovative per materiali, sensori ed imaging
Ciclo di dottorato: 26
Coordinatore del Corso di dottorato:
nomeemail
Lanotte, Lucianolanotte@na.infn.it
Tutor:
nomeemail
Maddalena, PasqualinoUNSPECIFIED
Tassini, PaoloUNSPECIFIED
Maglione, Maria GraziaUNSPECIFIED
Date: 31 March 2014
Number of Pages: 153
Uncontrolled Keywords: OTFT, organic thin film transistor, Stability, Stress
Settori scientifico-disciplinari del MIUR: Area 03 - Scienze chimiche > CHIM/05 - Scienza e tecnologia dei materiali polimerici
Area 03 - Scienze chimiche > CHIM/06 - Chimica organica
Area 02 - Scienze fisiche > FIS/01 - Fisica sperimentale
Area 02 - Scienze fisiche > FIS/03 - Fisica della materia
Area 09 - Ingegneria industriale e dell'informazione > ING-INF/01 - Elettronica
Aree tematiche (7° programma Quadro): NANOSCIENZE, NANOTECNOLOGIE, MATERIALE E PRODUZIONE > Nanoscienze e Nanotecnologie
NANOSCIENZE, NANOTECNOLOGIE, MATERIALE E PRODUZIONE > Materiali
NANOSCIENZE, NANOTECNOLOGIE, MATERIALE E PRODUZIONE > Nuove produzioni
NANOSCIENZE, NANOTECNOLOGIE, MATERIALE E PRODUZIONE > Integrazione di tecnologie per applicazioni industriali
Date Deposited: 11 Apr 2014 15:48
Last Modified: 27 Jan 2015 08:40
URI: http://www.fedoa.unina.it/id/eprint/9921

Abstract

Field-effect transistor (FET) is an electronic device that relies on the electric field to control a current through a "conductive channel" made of a semiconducting material. When the active layer is fabricated from organic semiconductors, the device is referred to as an organic field-effect transistor (OFET). The most common configuration of an OFET is the organic thin film transistor (OTFT). In this thesis it has been proposed to study and characterize innovative solution process OTFTs made using organic semiconductors and insulators, and in particular the influence of some process parameters for their behaviour under various stress conditions. Solution-processed organic materials used for electronic devices have been deposited and processed employing very cheap and simple methods, like spin-coating and drop casting. The properties of organic materials strongly depend on their morphology, which depends on the method of deposition. Morphology also influences the behaviour of the interfaces between the materials, so can be very important for the performances of the device, in particular for OTFTs. Device instability and limited lifetime have been so far the hurdles to commercialization of organic electronics. Through electrical characterizations and microscopy techniques, much progress has been made in understanding the stress mechanism that limits the stability of organic field-effect transistors. In this thesis, one device architecture and different technological configurations have been applied, while three distinct sources of stress have been used (voltage, environment and light) to study their actions on the properties of the devices, to deduce the influence of the devices’ processing on their stability and to enable controllable and reproducible devices fabrication. The kinetics and the mechanisms of charge trapping in organic semiconductors are found able to explain the observed instability behaviours in OTFTs.

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