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Synthesis and Stability Study of Conjugated Organic Materials for Organic Photovoltaics
Synthesis and Stability Study of Conjugated Organic Materials for Organic Photovoltaics
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152126
- ISBN
- 9798383692110
- DDC
- 620.11
- 저자명
- Zhong, Xiaowei.
- 서명/저자
- Synthesis and Stability Study of Conjugated Organic Materials for Organic Photovoltaics
- 발행사항
- [Sl] : The University of North Carolina at Chapel Hill, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 240 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
- 주기사항
- Advisor: You, Wei.
- 학위논문주기
- Thesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2024.
- 초록/해제
- 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.
- 일반주제명
- Materials science
- 일반주제명
- Organic chemistry
- 일반주제명
- Molecular chemistry
- 기타저자
- The University of North Carolina at Chapel Hill Materials Science
- 기본자료저록
- Dissertations Abstracts International. 86-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152126
■006m o d
■007cr#unu||||||||
■020 ▼a9798383692110
■035 ▼a(MiAaPQ)AAI31482714
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620.11
■1001 ▼aZhong, Xiaowei.
■24510▼aSynthesis and Stability Study of Conjugated Organic Materials for Organic Photovoltaics
■260 ▼a[Sl]▼bThe University of North Carolina at Chapel Hill▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a240 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-02, Section: B.
■500 ▼aAdvisor: You, Wei.
■5021 ▼aThesis (Ph.D.)--The University of North Carolina at Chapel Hill, 2024.
■520 ▼aOrganic 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.
■590 ▼aSchool code: 0153.
■650 4▼aMaterials science
■650 4▼aOrganic chemistry
■650 4▼aMolecular chemistry
■653 ▼aOrganic Solar Cells
■653 ▼aBulk Heterojunction
■653 ▼aSmall molecule acceptors
■653 ▼aFused Ring Electron Acceptors
■690 ▼a0794
■690 ▼a0431
■690 ▼a0490
■71020▼aThe University of North Carolina at Chapel Hill▼bMaterials Science.
■7730 ▼tDissertations Abstracts International▼g86-02B.
■790 ▼a0153
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163031▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
