Date of Award

5-2019

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Electrical and Computer Engineering (Holcomb Dept. of)

Committee Member

William Rodney Harrell, Committee Chair

Committee Member

Igor Luzinov

Committee Member

Goutam Koley

Abstract

Organic thin-film transistors (OTFTs) have been in the market for a long time; however, it is only recently that they have started taking over a major portion of the electronics industry which includes large area flexible displays, organic light emitting diodes (OLEDs), and many other applications. OTFTs based on P3HT (poly 3-hexylthiophene) are of particular interest and have been investigated more than most other organic semiconductor-based OTFTs primarily because of its excellent solubility in a wide variety of solvents, making it relatively simple to deposit a thin film on a substrate by less complex solution processing methods such as dip-coating and spin-coating. However, the performance of P3HT based transistors are poor and there has been a lot of efforts put into enhancing its mobility.

In this thesis, we designed, fabricated, and characterized functional organic thin film transistors with P3HT as the semiconductor and present and discuss the results. With enhancing the mobility, improving the thermal stability and improving the adhesion of P3HT to the dielectric as the aim, we added a mono layer and a dual layer of graphene oxide in between the dielectric and the P3HT and characterized the devices. The results from both of these cases are presented and discussed.

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