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Role of Topology and Defects on Transport Properties in Materials
Role of Topology and Defects on Transport Properties in Materials
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152645
- ISBN
- 9798384019862
- DDC
- 620.11
- 서명/저자
- Role of Topology and Defects on Transport Properties in Materials
- 발행사항
- [Sl] : Northwestern University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 313 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
- 주기사항
- Advisor: Snyder, G. Jeffrey.
- 학위논문주기
- Thesis (Ph.D.)--Northwestern University, 2024.
- 초록/해제
- 요약Electrical and thermal properties of materials impact many important innovations, from microelectronics to energy harvesting and storage. The complex relationship between electrical and thermal properties is on full display in thermoelectric materials, where electrical energy can be generated from, or conversely drive, heat flow. Thermoelectrics have far-reaching applications in powering low-maintenance devices such as remote Internet-of-Things sensors and deep space vehicles. Thermoelectrics also offer a green alternative to traditional cooling systems, which typically employ hydrofluorocarbon refrigerants that are harmful to the environment. However, despite the multi-faceted use of thermoelectrics, a major drawback preventing widespread implementation is the low electrical-to-thermal power conversion efficiency of many known materials. Consequently, there is a strong need in the field to discover new materials with favorable intrinsic properties, as well as to optimize known materials through, e.g., defect engineering.In this thesis, predictive models of electronic structure, charge transport, and defect thermodynamics are developed and employed to advance thermoelectric materials design. Computational and theoretical (pencil-and-paper) methods generally provide useful guidance in materials engineering, from enabling high-throughput discovery to exploring the effects of varying processing conditions on performance. This is no exception in thermoelectrics research, where modeling has proven invaluable for helping to reach some of the highest power conversion efficiencies recorded to date. Here, modeling is combined with first-principles calculations as "virtual experiments" to understand the fundamental roles of material physics and chemistry in thermoelectric properties.The thesis is organized into four parts. In Part I, fundamental relationships between band inversion in topological insulators, band warping, and thermoelectric properties/performance are revealed using k.p perturbation theory. Notably, the study marks topological insulators as serious candidates for thermoelectric applications, owing to a phenomenon known as band inversion-driven warping. In Part II, physics-informed material descriptors are derived from Boltzmann transport theory, which are then implemented in a computational workflow to discover new thermoelectrics. The screening procedure identifies promising candidates for next-generation Peltier cooling devices, and the work inspires a new, composite descriptor which can be employed to pinpoint new candidates in the future. In Part III, calculations of point defect energetics are performed following modern defect theory, in order to understand doping prospects and limitations in materials. The extent to which the thermoelectric performance of a material can be optimized is strongly influenced by the ability to dope the material, making computations valuable for guiding thermoelectric development. In Part IV, a series of vignettes are provided in which modern defect theory is extended beyond thermoelectrics research. From analyzing the dopability of superconductors to enabling a chemical intuition for defect-induced electronic states, defect calculations play an instrumental role in modeling defect-related properties of solid-state materials in general.
- 일반주제명
- Materials science
- 일반주제명
- Electromagnetics
- 일반주제명
- Thermodynamics
- 키워드
- Defects
- 키워드
- Semiconductors
- 키워드
- Theory
- 키워드
- Thermoelectrics
- 키워드
- Charge transport
- 기타저자
- Northwestern University Materials Science and Engineering
- 기본자료저록
- Dissertations Abstracts International. 86-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152645
■006m o d
■007cr#unu||||||||
■020 ▼a9798384019862
■035 ▼a(MiAaPQ)AAI31485794
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620.11
■1001 ▼aToriyama, Michael Y.▼0(orcid)0000-0002-2530-1390
■24510▼aRole of Topology and Defects on Transport Properties in Materials
■260 ▼a[Sl]▼bNorthwestern University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a313 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-02, Section: B.
■500 ▼aAdvisor: Snyder, G. Jeffrey.
■5021 ▼aThesis (Ph.D.)--Northwestern University, 2024.
■520 ▼aElectrical and thermal properties of materials impact many important innovations, from microelectronics to energy harvesting and storage. The complex relationship between electrical and thermal properties is on full display in thermoelectric materials, where electrical energy can be generated from, or conversely drive, heat flow. Thermoelectrics have far-reaching applications in powering low-maintenance devices such as remote Internet-of-Things sensors and deep space vehicles. Thermoelectrics also offer a green alternative to traditional cooling systems, which typically employ hydrofluorocarbon refrigerants that are harmful to the environment. However, despite the multi-faceted use of thermoelectrics, a major drawback preventing widespread implementation is the low electrical-to-thermal power conversion efficiency of many known materials. Consequently, there is a strong need in the field to discover new materials with favorable intrinsic properties, as well as to optimize known materials through, e.g., defect engineering.In this thesis, predictive models of electronic structure, charge transport, and defect thermodynamics are developed and employed to advance thermoelectric materials design. Computational and theoretical (pencil-and-paper) methods generally provide useful guidance in materials engineering, from enabling high-throughput discovery to exploring the effects of varying processing conditions on performance. This is no exception in thermoelectrics research, where modeling has proven invaluable for helping to reach some of the highest power conversion efficiencies recorded to date. Here, modeling is combined with first-principles calculations as "virtual experiments" to understand the fundamental roles of material physics and chemistry in thermoelectric properties.The thesis is organized into four parts. In Part I, fundamental relationships between band inversion in topological insulators, band warping, and thermoelectric properties/performance are revealed using k.p perturbation theory. Notably, the study marks topological insulators as serious candidates for thermoelectric applications, owing to a phenomenon known as band inversion-driven warping. In Part II, physics-informed material descriptors are derived from Boltzmann transport theory, which are then implemented in a computational workflow to discover new thermoelectrics. The screening procedure identifies promising candidates for next-generation Peltier cooling devices, and the work inspires a new, composite descriptor which can be employed to pinpoint new candidates in the future. In Part III, calculations of point defect energetics are performed following modern defect theory, in order to understand doping prospects and limitations in materials. The extent to which the thermoelectric performance of a material can be optimized is strongly influenced by the ability to dope the material, making computations valuable for guiding thermoelectric development. In Part IV, a series of vignettes are provided in which modern defect theory is extended beyond thermoelectrics research. From analyzing the dopability of superconductors to enabling a chemical intuition for defect-induced electronic states, defect calculations play an instrumental role in modeling defect-related properties of solid-state materials in general.
■590 ▼aSchool code: 0163.
■650 4▼aMaterials science
■650 4▼aElectromagnetics
■650 4▼aThermodynamics
■653 ▼aDefects
■653 ▼aSemiconductors
■653 ▼aTheory
■653 ▼aThermoelectrics
■653 ▼aTopological insulators
■653 ▼aCharge transport
■690 ▼a0794
■690 ▼a0348
■690 ▼a0607
■71020▼aNorthwestern University▼bMaterials Science and Engineering.
■7730 ▼tDissertations Abstracts International▼g86-02B.
■790 ▼a0163
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163260▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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