자료유형  

 학위논문

Control Number  

0017164009

International Standard Book Number  

9798346856603

Dewey Decimal Classification Number  

541

Main Entry-Personal Name  

Williams, Malik Leon.

Publication, Distribution, etc. (Imprint  

[S.l.] : Northwestern University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

441 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-06, Section: B.

General Note  

Advisor: Wasielewski, Michael R.

Dissertation Note  

Thesis (Ph.D.)--Northwestern University, 2024.

Summary, Etc.  

요약Donor-acceptor (D-A) systems have emerged as valuable frameworks for studying charge transfer (CT) exciton dynamics. Single co-crystals featuring D-A pairs provide a controlled environment to investigate the formation and migration of CT excitons. The precise arrangement of donor and acceptor molecules within these co-crystals influences their electronic properties and charge transport behaviors. Understanding these interactions at a molecular level is critical for designing materials with high efficiency in solar energy conversion.This thesis delves into the intricate dynamics of SF and CT in various organic semiconductor systems, with a particular focus on PDI derivatives and D-A co-crystals. By employing advanced spectroscopic techniques and theoretical analyses, we aim to elucidate the fundamental processes governing exciton generation, separation, and migration in these materials. The findings from this research are expected to inform the design principles for next-generation photovoltaic devices, offering pathways to significantly enhance their efficiency and performance. In Chapter 2, we explore the impact of crystallinity on the SF rate and triplet exciton yield in PDI single crystals and polycrystalline thin films. Chapters 3 and 4 extend this investigation to fluorinated PDI and H-, C3-H-, and C3- terminated tetraphenoxy PDI derivatives, examining how molecular packing affects their photophysical properties. Chapters 5 and 6 focus on D-A systems, synthesizing and characterizing new covalently bound D-A crystals to understand their charge separation and recombination dynamics. Finally, Chapters 7, 8, and 9 provide a comprehensive analysis of donor-acceptor co-crystals based on flat, aromatic hydrogen carbon donor-acceptor assemblies (chapters 7 and 8) and NDIΔ-based donor-acceptor systems (chapter 9), highlighting the role of supramolecular structures in determining their electronic behaviors.The overarching goal of this thesis is to deepen our understanding of the fundamental mechanisms in SF and CT processes, thereby paving the way for the development of highly efficient organic solar cells and other optoelectronic devices. Through a combination of experimental and theoretical approaches, we aim to contribute valuable insights into the design and optimization of organic semiconductors for energy conversion applications.

Subject Added Entry-Topical Term  

Physical chemistry.

Subject Added Entry-Topical Term  

Organic chemistry.

Subject Added Entry-Topical Term  

Materials science.

Index Term-Uncontrolled  

Crystallography

Index Term-Uncontrolled  

Transient absorption microscopy

Index Term-Uncontrolled  

Donor-acceptor

Index Term-Uncontrolled  

Semiconductor systems

Index Term-Uncontrolled  

Solar energy conversion

Added Entry-Corporate Name  

Northwestern University Chemistry

Host Item Entry  

Dissertations Abstracts International. 86-06B.

Electronic Location and Access  

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Control Number  

joongbu:654421