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Anion Exchange Doping in Semiconducting Polymers
Anion Exchange Doping in Semiconducting Polymers
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153124
- ISBN
- 9798346855187
- DDC
- 540
- 서명/저자
- Anion Exchange Doping in Semiconducting Polymers
- 발행사항
- [Sl] : University of California, Los Angeles, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 113 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
- 주기사항
- Advisor: Schwartz, Benjamin J.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Los Angeles, 2024.
- 초록/해제
- 요약Conjugated polymers (CPs) are organic semiconducting materials that offer a promising alternative to inorganic semiconductors as they are flexible, inexpensive, and solution-processable. The biggest challenge in integrating CPs into thermoelectric and other devices is their limited electrical conductivity, especially in comparison to their inorganic counterparts. Recent efforts have focused on enhancing the performance of CPs by using another molecule to dope the polymer and create charge carriers. The sequential processing (SqP) method [Aguirre et. al. Adv. Energy Mater. 2015, 1402020], developed by our group, works by casting the polymer and dopants from semi-orthogonal solvents. By separating the polymer and doping casting steps, the polymer has enough time to aggregate, allowing control over the polymer crystallinity by changing the regioregularity or polymer processing conditions. Using SqP, we can study the effects of tuning the polymer crystallinity with anion-exchange (AX) doping, in which a high concentration of inert salt anion accompanies the introduction of the dopant [Yamashita et. al. Nature 572,634-638 (2019)]. In this dissertation, we will explore how introducing a molecular oxidant with and without an inert salt affects the conductivity of polymers with different crystallinities; we also will examine new spectroscopic features associated with AX doping that to date have been unassigned in the literature. The first chapter of this dissertation gives an overview of conjugated polymers, different doping mechanisms, and the tools we use to analyze doped-polymers including absorption, x-ray diffraction, and electrical Hall effect measurements. In chapter two we focus on AX doping and how the new doping mechanism affects the electrical properties of a well-studied polymer with varying crystallinities. Chapter three explores two new spectroscopic features that appear when using high concentration dopant and salt during the AX doping process. Using Resonance Raman spectroscopy and quantum chemistry calculations, we are able to assign these peaks to a salt-dopant complex that is formed during the exchange process. Chapter four explores the doping mechanism of a very strong oxidant that has been recently introduced to the polymer literature. Although there is debate on if the dopant counterion infiltrates the entirety of the polymer or just the amorphous regions, we show that the dopant does affect the crystal structure, indicating its intercalation into crystalline sites. Finally, chapter five discusses theoretical calculations on tungsten tetraboride, a synthetic inorganic material that has been discovered to have superhard characteristics. This chapter explores the various bonding properties of tungsten tetraboride to understand if the hardening affects are due to extrinsic or intrinsic affects. Although many unsolved questions remain in the conjugated polymer field, this dissertation breaks ground as foundational work in understanding new doping methods and molecular oxidants that have been introduced into the field.
- 일반주제명
- Chemistry
- 일반주제명
- Polymer chemistry
- 일반주제명
- Analytical chemistry
- 일반주제명
- Materials science
- 키워드
- Anion exchange
- 키워드
- Doping
- 키워드
- Hall effect
- 기타저자
- University of California, Los Angeles Chemistry 0153
- 기본자료저록
- Dissertations Abstracts International. 86-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211153124
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■007cr#unu||||||||
■020 ▼a9798346855187
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a540
■1001 ▼aMehmedovic, Zerina.
■24510▼aAnion Exchange Doping in Semiconducting Polymers
■260 ▼a[Sl]▼bUniversity of California, Los Angeles▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a113 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-06, Section: B.
■500 ▼aAdvisor: Schwartz, Benjamin J.
■5021 ▼aThesis (Ph.D.)--University of California, Los Angeles, 2024.
■520 ▼aConjugated polymers (CPs) are organic semiconducting materials that offer a promising alternative to inorganic semiconductors as they are flexible, inexpensive, and solution-processable. The biggest challenge in integrating CPs into thermoelectric and other devices is their limited electrical conductivity, especially in comparison to their inorganic counterparts. Recent efforts have focused on enhancing the performance of CPs by using another molecule to dope the polymer and create charge carriers. The sequential processing (SqP) method [Aguirre et. al. Adv. Energy Mater. 2015, 1402020], developed by our group, works by casting the polymer and dopants from semi-orthogonal solvents. By separating the polymer and doping casting steps, the polymer has enough time to aggregate, allowing control over the polymer crystallinity by changing the regioregularity or polymer processing conditions. Using SqP, we can study the effects of tuning the polymer crystallinity with anion-exchange (AX) doping, in which a high concentration of inert salt anion accompanies the introduction of the dopant [Yamashita et. al. Nature 572,634-638 (2019)]. In this dissertation, we will explore how introducing a molecular oxidant with and without an inert salt affects the conductivity of polymers with different crystallinities; we also will examine new spectroscopic features associated with AX doping that to date have been unassigned in the literature. The first chapter of this dissertation gives an overview of conjugated polymers, different doping mechanisms, and the tools we use to analyze doped-polymers including absorption, x-ray diffraction, and electrical Hall effect measurements. In chapter two we focus on AX doping and how the new doping mechanism affects the electrical properties of a well-studied polymer with varying crystallinities. Chapter three explores two new spectroscopic features that appear when using high concentration dopant and salt during the AX doping process. Using Resonance Raman spectroscopy and quantum chemistry calculations, we are able to assign these peaks to a salt-dopant complex that is formed during the exchange process. Chapter four explores the doping mechanism of a very strong oxidant that has been recently introduced to the polymer literature. Although there is debate on if the dopant counterion infiltrates the entirety of the polymer or just the amorphous regions, we show that the dopant does affect the crystal structure, indicating its intercalation into crystalline sites. Finally, chapter five discusses theoretical calculations on tungsten tetraboride, a synthetic inorganic material that has been discovered to have superhard characteristics. This chapter explores the various bonding properties of tungsten tetraboride to understand if the hardening affects are due to extrinsic or intrinsic affects. Although many unsolved questions remain in the conjugated polymer field, this dissertation breaks ground as foundational work in understanding new doping methods and molecular oxidants that have been introduced into the field.
■590 ▼aSchool code: 0031.
■650 4▼aChemistry
■650 4▼aPolymer chemistry
■650 4▼aAnalytical chemistry
■650 4▼aMaterials science
■653 ▼aAnion exchange
■653 ▼aConjugated polymers
■653 ▼aDoping
■653 ▼aElectronic properties
■653 ▼aHall effect
■690 ▼a0485
■690 ▼a0486
■690 ▼a0495
■690 ▼a0794
■71020▼aUniversity of California, Los Angeles▼bChemistry 0153.
■7730 ▼tDissertations Abstracts International▼g86-06B.
■790 ▼a0031
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17165104▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


