자료유형  

 학위논문

Control Number  

0016932831

International Standard Book Number  

9798379848705

Dewey Decimal Classification Number  

658

Main Entry-Personal Name  

Luo, Xuyi.

Publication, Distribution, etc. (Imprint  

[S.l.] : Purdue University., 2022

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2022

Physical Description  

1 online resource(129 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

General Note  

Advisor: Mei, Jianguo.

Dissertation Note  

Thesis (Ph.D.)--Purdue University, 2022.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약The field of semiconducting conjugated polymers has grown tremendously over the past few decades with innovations expanding the use of conjugated polymers into several devices such as transistors, light emitting diodes, and biocompatible electronics. For transistor devices, charge carrier mobility has rivaled the performance of amorphous silicon. The intrinsic properties of organic materials make them extremely attractive for further development and application. Organic materials are synonymous with terms such as lightweight, robust, flexible, and stretchable. A major advantage of conjugated polymers is their ability to be rendered solution processable with the alluring potential for large-area green manufacturing of electronic devices. However, these properties often fall short of their potential. Often strain engineering is often employed for favorable mechanical properties of polymer thin films.Incorporation of acceptor-acceptor (A-A) type moieties into donor-acceptor (D-A) type conjugated polymers becomes a new strategy to tune their electronic properties. In this work, we first demonstrate an efficient convergent route to prepare isoindigo-based A-A type building blocks - bis-isoindigos - via the palladium-catalyzed oxidative coupling. Bis-isoindigo-based polymers show high planarity and delocalized frontier molecular orbitals with lowered LUMO and intact HOMO energy levels, in comparison with their corresponding mono-isoindigo counterparts. Moreover, fluorine substitution on donors only lowers HOMO levels of Bis-IID polymers. This study asserts that the D-A-A strategy is effective in selectively tuning FMO energy levels of conjugated polymers, complementary to the D-D-A approach for the HOMO energy level tuning. Finally, we investigated the effect ofisomer structure has on the properties of conjugation polymers utilizing diazines to decouple the effects of spatial arrangement from heteroatom placement. These studies highlight the significant impact of side-chain sequence regioisomerism on aggregation behaviors, morphologies, and subsequently charge transport properties of donor-acceptor type conjugated polymers.

Subject Added Entry-Topical Term  

Polymer solubility.

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Behavior.

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Electrolytes.

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Electrodes.

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Oxidation.

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Semiconductors.

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Fluorine.

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Light emitting diodes.

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Molecular weight.

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Engineering.

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Energy.

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Voltammetry.

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Chromatography.

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Transistors.

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Thin films.

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Condensed matter physics.

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Electrical engineering.

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Materials science.

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Optics.

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Physics.

Added Entry-Corporate Name  

Purdue University.

Host Item Entry  

Dissertations Abstracts International. 85-01B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:643614