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Self-Assembled Monolayer of Cycloalkyl-Terminated Phosphonic Acids: Structures and Applications for Interface Engineering of n-Channel Organic Thin Film Transistors
Başlık:
Self-Assembled Monolayer of Cycloalkyl-Terminated Phosphonic Acids: Structures and Applications for Interface Engineering of n-Channel Organic Thin Film Transistors
Yazar:
Shan, Bowen, author.
ISBN:
9780438106284
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (171 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Özet:
Self-assembled monolayers (SAMs) are two-dimensional structures that formed spontaneously on a variety of surfaces. Due to the abilities of dramatically changing surface properties, SAMs are proved to be a powerful tool for interface engineering of organic thin film transistors (OTFTs), which are basically interface devices with their performance strongly relying on the structures and properties of device interfaces. Detailed in this thesis are studies of self-assembled monolayer of organophosphonic acids, including synthesis, characterization and application for interface engineering of n-channel OTFTs.
N-type organic semiconductors are currently underdeveloped in comparison to the p-type counterparts, partially due to the inherent instability of organic anions, particularly, in the presence of air and water. In Chapter 1, we survey n-type organic semiconductors with field effect mobility of 1 cm2/Vs or higher to reach conclusions on high performance n-type semiconductors by molecular design and device fabrication techniques with a focus on interface engineering. A comprehensive introduction about SAMs of organophosphonic acid is also presented, including definition, characterization and application for interface engineering of n-channel OTFTs.
In Chapter 2, vacuum-deposited OTFTs of C60 on 12-cyclohexyldodecylphosphonic acid (CDPA)-modified AlOx/SiO2 dielectric exhibit an unprecedentedly high electron mobility of 41.4 cm2/Vs as measured in vacuum, which is the highest value for all the n-channel organic field effect transistors. In comparison with ODPA, the structures of the SAMs and C60 thin films were analyzed by different techniques. Molecular dynamics simulations were performed to reveal structure difference of SAMs at the molecular level, which show a good agreement with the experimental results. Characterization of C60 thin films by two-dimensional grazing-incident wide--angle X-ray scattering (2D-GIWAXS) and atomic force microscope (AFM) reveals an epitaxial growth of C60 on the SAM of CDPA, which explains the extremely high performance of OTFTs of C 60 film on CDPA-modified AlOx/SiO2.
Chapter 3 puts forth a series of new design of SAMs for interface engineering of high performance OTFTs. This design of self-assembled organophosphonic acid combines a long alkyl chain and a different carbocycle terminal group, resulting in SAMs with different orientation, size and flexibility. These rationally designed phosphonic acid molecules allow us to finely tune the properties of the dielectric surface. OTFTs based on these SAMs exhibit various device performance. It is found that, among all of the carbocycle-terminated SAMs tested in this study, the cyclohexyl-terminated SAMs have led to the best-performing vacuum-deposited thin films of C60 and solution-processed thin films of TIPS-TAP. OTFTs of C60 on CDPA- and 12-cyclohexylundecylphosphonic acid (CUPA)-modified AlOx/SiO2 show unprecedentedly high electron mobilities of 41.4 cm2/Vs and 39.0 cm 2/Vs, respectively. These results indicate that among all the carbocycles tested in this study, cyclohexyl is the best terminal group and the effect of an odd or even number of carbon atoms in the long alkyl chain is negligible.
Notlar:
School code: 1307
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(687327.1) | 687327-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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