자료유형  

 학위논문

Control Number  

0017163031

International Standard Book Number  

9798383692110

Dewey Decimal Classification Number  

620.11

Main Entry-Personal Name  

Zhong, Xiaowei.

Publication, Distribution, etc. (Imprint  

[S.l.] : The University of North Carolina at Chapel Hill., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

240 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-02, Section: B.

General Note  

Advisor: You, Wei.

Dissertation Note  

Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2024.

Summary, Etc.  

요약Organic Solar Cells (OSCs) have achieved efficiencies up to 20%, yet their stability remains a pressing concern, especially for high-efficiency systems like Bulk Heterojunction (BHJ) solar cells. This thesis examines the chemical and morphological stability of OSCs, from the perspectives of the roles of donor and acceptor materials' chemical structures. We first developed a modified synthetic method to D18 series polymers which have shown record-high efficiencies in OSCs. With a well-defined polymerization method, we were able to access high-molar-mass conjugated polymers and control the molar mass distribution readily. Next, we modified the synthesis of commonly employed small molecule acceptors (SMAs), the other key component for donor-acceptor based BHJ OSCs. Our improved and much simpler synthesis of Fused Ring Electron Acceptors (FREAs) enabled further exploration of the structural effects on both morphological and chemical stability. This led to the observation of the intrinsic instability of prevailing SMAs. The polarized double bonds are responsible for most chemical instability observed with SMAs. Larger differences between the donor moiety and the acceptor moiety on each side of the double bonds can lead to higher instability, yet steric hindrance can effectively protect the double bond from decomposition. With these synthetic tools, we then synthesized SMAs with extended backbone lengths, which could exhibit smaller diffusion coefficients towards more stable morphology. Finally, to understand why polymerized SMAs (PSMAs) usually present low molar-mass, we synthesized high-molar-mass PSMAs and modified the purification process to prevent unintended degradation of PSMAs, aiming to achieve both better morphological and chemical stability. These advancements should contribute to the development of more stable and efficient OSCs.

Subject Added Entry-Topical Term  

Materials science.

Subject Added Entry-Topical Term  

Organic chemistry.

Subject Added Entry-Topical Term  

Molecular chemistry.

Index Term-Uncontrolled  

Organic Solar Cells

Index Term-Uncontrolled  

Bulk Heterojunction

Index Term-Uncontrolled  

Small molecule acceptors

Index Term-Uncontrolled  

Fused Ring Electron Acceptors

Added Entry-Corporate Name  

The University of North Carolina at Chapel Hill Materials Science

Host Item Entry  

Dissertations Abstracts International. 86-02B.

Electronic Location and Access  

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Control Number  

joongbu:655131