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Title: Organic semiconductor devices : fabrication, characterisation and sensing applications
Author: Dragoneas, Antonis
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2013
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Organic semiconductors have increased in popularity over the last two decades. The versatility of organic chemistry enables the development of organic semiconductor devices which can substitute for their abundant inorganic counterparts in various applications. A series of recent innovations in both synthetic chemistry and device fabrication have resulted in remarkable improvements in both the performance and the environmental stability of organic semiconductor devices, which had initially hindered their industrial growth. Moreover, the processability of organic materials facilitates the development of large-scale electronics on flexible plastic substrates. In addition, the interesting peculiarities of organic semiconductors can be harnessed for the development of gas sensors. The field of organic field-effect transistors (OFETs) is promising for the development of gas sensors capable of detecting more specific interactions between the substance under investigation (analyte) and the sensitive materials of the sensor; the advantage of OFET sensors derives from their complex structure and the plethora of parameters which govern their operation. This thesis focuses on the field of organic semiconductor devices intended for gas sensing applications. The research work presented here includes the optimisation of the device fabrication methodology with an emphasis on the field of OFETs, the development of bespoke readout electronics for the effective characterisation of these devices and the demonstration of their sensing capabilities by performing quantitative measurements with the aid of the developed readout electronics. Additionally, a study of the environmental stability of the fabricated devices was conducted; this study included an extensive investigation of the sensitivity of these devices to visible light illumination and a demonstration of how minor fabrication optimisations can result in significant light stability enhancement.
Supervisor: Grell, Martin Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available