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Synthesis and Stability Study of Con...

Zhong, Xiaowei,

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Synthesis and Stability Study of Conjugated Organic Materials for Organic Photovoltaics /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Synthesis and Stability Study of Conjugated Organic Materials for Organic Photovoltaics // Xiaowei Zhong.
Author:	Zhong, Xiaowei,
Description:	1 electronic resource (240 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
Contained By:	Dissertations Abstracts International86-02B.
Subject:	Materials science. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31482714
ISBN:	9798383692110

Synthesis and Stability Study of Conjugated Organic Materials for Organic Photovoltaics /
Zhong, Xiaowei,

Synthesis and Stability Study of Conjugated Organic Materials for Organic Photovoltaics /Xiaowei Zhong. - 1 electronic resource (240 pages)

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

Organic 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.

English

ISBN: 9798383692110Subjects--Topical Terms:

543314
Materials science.
Subjects--Index Terms:

Organic Solar Cells

Synthesis and Stability Study of Conjugated Organic Materials for Organic Photovoltaics /
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500 $a Advisors: You, Wei Committee members: Zhukhovitskiy, Aleksandr V.; Lopez, Rene; Sheiko, Sergey; Bai, Wubin.
502 $b Ph.D. $c The University of North Carolina at Chapel Hill $d 2024.
520 $a Organic 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.
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650 4 $a Molecular chemistry. $3 1071612
653 $a Organic Solar Cells
653 $a Bulk Heterojunction
653 $a Small molecule acceptors
653 $a Fused Ring Electron Acceptors
690 $a 0794
690 $a 0431
690 $a 0490
710 2 $a The University of North Carolina at Chapel Hill. $b Materials Science. $e degree granting institution. $3 3825123
720 1 $a You, Wei $e degree supervisor.
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