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Investigation of Phonon and Thermal Properties of Semiconductors Using Brillouin-Mandelstam Light Scattering Spectroscopy
Investigation of Phonon and Thermal Properties of Semiconductors Using Brillouin-Mandelstam Light Scattering Spectroscopy
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105637
- ISBN
- 9798265451828
- DDC
- 620.11
- 저자명
- Wright, Dylan.
- 서명/저자
- Investigation of Phonon and Thermal Properties of Semiconductors Using Brillouin-Mandelstam Light Scattering Spectroscopy
- 발행사항
- [Sl] : University of California, Los Angeles, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 124 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisor: Balandin, Alexander A.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Los Angeles, 2025.
- 초록/해제
- 요약This dissertation describes the use of Brillouin-Mandelstam light scattering spectroscopy for directly measuring acoustic phonon frequencies and phonon velocities in semiconductors. It discusses the implications of the changes in acoustic phonon characteristics for the thermal properties of semiconductors. The data for acoustic phonons is complemented with the frequencies of optical phonons obtained from Raman light scattering spectroscopy. The dissertation is divided into several parts, which include the description of the fundamentals of the Brillouin-Mandelstam spectroscopy; phonons in quasi-two-dimensional antiferromagnetic semiconductors; phonons in Si-doped AlN thin films; phonons in β-Ga2O3 ultra-wide bandgap semiconductors; and phonons in single-crystal diamond studied over a broad temperature range. In antiferromagnetic semiconductors of the transition metal phosphorus trisulfide family, I found a large variation in the acoustic phonon group velocities in materials with similar crystal structures. The extracted acoustic phonon lifetime was correlated with the thermal properties of these materials. In Si-doped AlN films, I observed that the acoustic phonon velocity decreases monotonically with increasing Si dopant concentration. The knowledge of the acoustic phonon velocities can be used for the optimization of the ultra-wide bandgap semiconductor heterostructures to minimize the thermal boundary resistance of high-power devices. In β-Ga2O3 semiconductors, I recorded pronounced anisotropy in the acoustic phonon dispersion and velocities across different crystallographic directions. The obtained information for acoustic phonons in β-Ga2O3 can be used for developing accurate theoretical models of phonon scattering and optimization of thermal and electrical transport in this technologically important ultra-wide bandgap semiconductor. In diamond, I investigated acoustic phonons in the temperature range from 10 K to 300 K. The obtained data can be used to optimize materials of cryogenic quantum sensors and surface acoustic wave devices. The results of this dissertation research attest to the potential of Brillouin-Mandelstam light scattering spectroscopy for material characterization of novel semiconductor materials and heterostructures.
- 일반주제명
- Materials science
- 일반주제명
- Engineering
- 일반주제명
- Acoustics
- 일반주제명
- Optics
- 기타저자
- University of California, Los Angeles Materials Science and Engineering 0328
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017360914
■00520260202105637
■006m o d
■007cr#unu||||||||
■020 ▼a9798265451828
■035 ▼a(MiAaPQ)AAI32395205
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620.11
■1001 ▼aWright, Dylan.
■24510▼aInvestigation of Phonon and Thermal Properties of Semiconductors Using Brillouin-Mandelstam Light Scattering Spectroscopy
■260 ▼a[Sl]▼bUniversity of California, Los Angeles▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a124 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisor: Balandin, Alexander A.
■5021 ▼aThesis (Ph.D.)--University of California, Los Angeles, 2025.
■520 ▼aThis dissertation describes the use of Brillouin-Mandelstam light scattering spectroscopy for directly measuring acoustic phonon frequencies and phonon velocities in semiconductors. It discusses the implications of the changes in acoustic phonon characteristics for the thermal properties of semiconductors. The data for acoustic phonons is complemented with the frequencies of optical phonons obtained from Raman light scattering spectroscopy. The dissertation is divided into several parts, which include the description of the fundamentals of the Brillouin-Mandelstam spectroscopy; phonons in quasi-two-dimensional antiferromagnetic semiconductors; phonons in Si-doped AlN thin films; phonons in β-Ga2O3 ultra-wide bandgap semiconductors; and phonons in single-crystal diamond studied over a broad temperature range. In antiferromagnetic semiconductors of the transition metal phosphorus trisulfide family, I found a large variation in the acoustic phonon group velocities in materials with similar crystal structures. The extracted acoustic phonon lifetime was correlated with the thermal properties of these materials. In Si-doped AlN films, I observed that the acoustic phonon velocity decreases monotonically with increasing Si dopant concentration. The knowledge of the acoustic phonon velocities can be used for the optimization of the ultra-wide bandgap semiconductor heterostructures to minimize the thermal boundary resistance of high-power devices. In β-Ga2O3 semiconductors, I recorded pronounced anisotropy in the acoustic phonon dispersion and velocities across different crystallographic directions. The obtained information for acoustic phonons in β-Ga2O3 can be used for developing accurate theoretical models of phonon scattering and optimization of thermal and electrical transport in this technologically important ultra-wide bandgap semiconductor. In diamond, I investigated acoustic phonons in the temperature range from 10 K to 300 K. The obtained data can be used to optimize materials of cryogenic quantum sensors and surface acoustic wave devices. The results of this dissertation research attest to the potential of Brillouin-Mandelstam light scattering spectroscopy for material characterization of novel semiconductor materials and heterostructures.
■590 ▼aSchool code: 0031.
■650 4▼aMaterials science
■650 4▼aEngineering
■650 4▼aAcoustics
■650 4▼aOptics
■653 ▼aSemiconductor materials
■653 ▼aAcoustic phonon velocity
■653 ▼aThermal properties
■690 ▼a0794
■690 ▼a0537
■690 ▼a0986
■690 ▼a0752
■71020▼aUniversity of California, Los Angeles▼bMaterials Science and Engineering 0328.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■790 ▼a0031
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360914▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


