Jones, Gavin B. (2015) Investigating self-assembled monolayers and understanding small molecule/polymer blend thin-films in organic field-effect transistors. PhD thesis, University of Warwick.

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Abstract

Organic Thin-Film Transistors (OTFTs) are now surpassing the performance of amorphous silicon based devices which once set the benchmark. State of the art development of OTFTs in active-matrix organic light emitting diodes (OLEDs) for flexible displays has shown the potential for future applications utilising organic materials. This unprecedented advancement of flexible base electronics is now at the forefront of research and development in the electronics industry. Although charge-carrier mobility has now exceeded expectations the processing of organic materials and device functionality is still under intense investigation. Through understanding energetic interactions and charge-carrier properties at the electrode/organic semiconductor (OSC) interface alongside morphological structuring of the thin-film active layer, a more complete understanding of OTFTs can be reached.

Active layers formed of a soluble small molecule blended with a polymer binder have shown significant improvements in OTFT operational performance and device yield due to enhanced morphological effects. This thesis will primarily discuss the implementation of 6,13-bis(triisopropyl-silylethynyl) pentacene (TIPS-pentacene) blended with poly(4-methylstyrene) (P4MS) in the expectation of enhanced device performance offering heightened charge-carrier mobility. Through investigative work conducted in this thesis into self-assembled monolayer (SAM) formation on the source/drain electrodes (Chapter 3), changes in the surface properties of the metal contact and the resulting interfacial properties at the electrode/OSC interface are correlated to OTFT performance, alongside morphological changes in the active layer and its relation to charge-carrier conduction in TIPS/P4MS thin-films (Chapter 4). Additional studies concerning 2,8-difluoro-5,11–bis (triethylsilylethynyl) anthradithiophene (diF-TES-ADT) are also discussed (Chapter 5) relating to similar processing and fabrication conditions.

Item Type:	Thesis or Dissertation (PhD)
Subjects:	Q Science > QC Physics
Library of Congress Subject Headings (LCSH):	Organic thin films, Thin film transistors
Official Date:	April 2015
Dates:	Date Event April 2015 Submitted
Institution:	University of Warwick
Theses Department:	Department of Chemistry
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Jones, T. S. (Tim S.) ; Wierzchowiec, Piotr
Extent:	x, 186 pages : illustrations (colour), charts
Language:	eng

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