Οπτοηλεκτρονικές διατάξεις οργανικών ημιαγωγών ως λειτουργικά μέρη μικροσυστημάτων ανίχνευσης και αποθήκευσης

Katsogridakis, Charalampos; Κατσογριδάκης, Χαράλαμπος

dc.contributor.author	Katsogridakis, Charalampos	el
dc.contributor.author	Κατσογριδάκης, Χαράλαμπος	en
dc.date.accessioned	2023-02-15T10:21:38Z
dc.date.available	2023-02-15T10:21:38Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/57144
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.24842
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	Τρανζίστορ	en
dc.subject	Οργανικών ημιαγωγοί	el
dc.subject	Πολυμερικά	el
dc.subject	Ηλεκτρονικές διατάξεις	el
dc.subject	Πυκνωτές	el
dc.subject	Άλατα τριαρυλοσουλφωνίου	el
dc.subject	Metal-Insulator-Semiconductor (MIS)	en
dc.subject	Organic Field Effect Transistor (OFET)	en
dc.subject	Conductive polymers	en
dc.subject	Semiconductors	en
dc.subject	Macromolecular materials	el
dc.title	Οπτοηλεκτρονικές διατάξεις οργανικών ημιαγωγών ως λειτουργικά μέρη μικροσυστημάτων ανίχνευσης και αποθήκευσης	el
heal.type	doctoralThesis
heal.classification	Μηχανική υλικών	el
heal.classification	Οργανικά ηλεκτρονικά	el
heal.language	el
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2022-11-10
heal.abstract	Αντικείμενο της παρούσας Διδακτορικής Διατριβής είναι η διερεύνηση της δυνατότητας καινοτόμων εφαρμογών των οργανικών ημιαγωγών ως λειτουργικών μερών διατάξεων για τη ανίχνευση και αποθήκευση πληροφορίας. Για την επίτευξη αυτού του στόχου κατασκευάζονται διάφορες ηλεκτρονικές διατάξεις, όπως πυκνωτές τύπου Μέταλλο-Μονωτής-Ημιαγωγός (Metal-Insulator-Semiconductor, MIS), οργανικά τρανζίστορ επίδρασης πεδίου (Organic Field Effect Transistor, OFET) αλλά και ηλεκτρονικές διατάξεις δύο τερματικών. Κοινό των διατάξεων που αναφέρθηκαν είναι, αφενός, η χρήση οργανικού ημιαγωγού και, αφετέρου, η χρήση αλάτων τριαρυλοσουλφωνίου στο διηλεκτρικό μέρος της διάταξης, ή απλώς ως μέρος αυτής στην περίπτωση των διατάξεων δύο-τερματικών. Τα άλατα τριαρυλοσουλφωνίου είναι μια ενδιαφέρουσα κατηγορία ιοντικών υλικών που έχουν τη δυνατότητα να παράγουν οξύ μέσω μιας φωτοχημικής αντίδρασης. Η κύρια εφαρμογή τους βρίσκεται στο πεδίο της φωτολιθογραφίας ως φωτοευαισθητοποιητών, ενώ έχουν χρησιμοποιηθεί και σε διατάξεις οργανικών διόδων εκπομπής φωτός βελτιώνοντας τα χαρακτηριστικά τους. Στην παρούσα διατριβή τα άλατα τριαρυλοσουλφωνίου χρησιμοποιούνται ως ουσίες που εισφέρουν στην ανίχνευση ακτινοβολίας και στη συνέχεια μεταβάλλουν τα ηλεκτρικά χαρακτηριστικά των διατάξεων με μετρήσιμο τρόπο μέσω του ηλεκτρικού χαρακτηρισμού των διατάξεων.	el
heal.abstract	Organic semiconductors as parts of functional devices began at a research level around 1980. The science and technology of semiconducting and conductive polymers and their application in the construction of functional devices is by nature an interdisciplinary subject. They fall at the crossroads of three established scientific fields, chemistry, physics and engineering. Organic semiconductors as macromolecular materials are synthesized by methods from organic chemistry. The electronic structure of molecules and their electronic properties fall into the field of solid state physics and finally the efficient processing of conjugated polymers for their respective application in functional electronic and optoelectronic devices requires the field of materials engineering and device physics. The object of this dissertation is to explore the possibility of innovative applications of organic semiconductors as functional parts of devices for detecting and storing information. To achieve this goal, various electronic devices are manufactured, such as Metal-Insulator-Semicondctor (MIS) type capacitors, Organic Field Effect Transistor (OFET) and electronic two-terminal devices. Common to the devices mentioned is, on the one hand, the use of an organic semiconductor and, on the other hand, the use of triarylsulfonium salts in the dielectric part of the device, or simply as part of it in the case of 2-terminal devices. Triarylsulfonium salts are an interesting class of ionic materials that have the potential to produce acid through a photochemical reaction. Their main application is in the field of photolithography as photosensitizers, while they have also been used in devices of organic light emitting diodes, improving their characteristics. In the present dissertation the triarylsulfonium salts are used as substances which contribute to the detection of radiation and then alter the electrical characteristics of the devices in a measurable way through the electrical characterization of the devices. Initially, a preliminary study was carried out, mainly of physicochemical characterizations, of the films and other materials that were to be used for the construction of the electronic devices. Films of the organic semiconductor and the dielectric film were characterized through UV-Visible, infrared spectroscopy and AFM methods. The effect of ultraviolet radiation on the visible-ultraviolet spectrum of the organic semiconductor as well as the photochemical production of acid by the triarylsulfonium salts were studied. Typical multilayer structures in the construction of electronic devices were formed and characterized. Then, the construction of MIS type capacitors was carried out. These devices were chosen as the first step as they are more simplistic in their operation than 3-terminal devices, such as field effect transistors. Through their electrical characterization, the effect of the photochemical reaction of acid production from triarylsulfonium salts on the electrical characteristics was studied. More specifically, weight was given to the xvii hysterisis of the characteristics recorded after irradiation exposure and to its quantification for the determination of the radiation dose. Two-terminal devices were then fabricated to examine the change in conductivity of the organic semiconductor after exposure to ultraviolet radiation. An important part of this study was the deeper understanding of interfacial phenomena that occur during the metal-semiconductor contact as well as phenomena related to the movement of ions in the composite polymer film used. Various factors affecting the conductivity of the device were examined, such as the size of the ions used, the previous chemical treatment of the device electrodes, and the material of which the electrodes are made. Finally, OFET type devices are made, 3-terminals where the effect of ultraviolet radiation on the electrical characteristics of the device is studied and the exact mode of operation of the transistor is ascertained. Various other factors are also studied such as the effect of the annealing temperature of the dielectric layer, the effect of the size of the ionic species, the salt concentration in the polymeric matrix and the effect of a different polymeric matrix on device performance. In conclusion, the use of triarylsulfonium salts in combination with the organic semiconductor in electronic devices of various types to achieve functional purposes such as, e.g., radiation detection and dosing presents many challenges. As mentioned at the beginning, convergence between different scientific fields is necessary at all levels of construction of a functional device. From the choice of materials, the understanding of phenomena on the molecular or nano-level that dominates e.g., in interfaces, up to more macroscopic phenomena such as e.g., the contact resistance found in th	en
heal.advisorName	Δημοτίκαλη, Δήμητρα
heal.advisorName	Χαριτίδης, Κωνσταντίνος
heal.advisorName	Αργείτης, Παναγιώτης
heal.committeeMemberName	Δημοτίκαλη, Δήμητρα
heal.committeeMemberName	Χαριτίδης, Κωνσταντίνος
heal.committeeMemberName	Αργείτης, Παναγιώτης
heal.committeeMemberName	Θεοδώρου, Θεόδωρος
heal.committeeMemberName	Κόλλια, Κωνσταντίνα
heal.committeeMemberName	Καπετανάκης, Ελευθέριος
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Χημικών Μηχανικών. Τομέας Επιστήμης και Τεχνικής των Υλικών (ΙΙΙ)	el
heal.academicPublisherID	ntua
heal.numberOfPages	233
heal.fullTextAvailability	false