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Exciton Effects in Hybrid Organic-Inorganic Perovskites and One-Dimensional Organic Metal Halide Hybrids- [electronic resource]
Exciton Effects in Hybrid Organic-Inorganic Perovskites and One-Dimensional Organic Metal Halide Hybrids- [electronic resource]
상세정보
- 자료유형
- 학위논문파일 국외
- 최종처리일시
- 20240214101146
- ISBN
- 9798379999476
- DDC
- 530
- 서명/저자
- Exciton Effects in Hybrid Organic-Inorganic Perovskites and One-Dimensional Organic Metal Halide Hybrids - [electronic resource]
- 발행사항
- [S.l.]: : University of California, Davis., 2023
- 발행사항
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- 형태사항
- 1 online resource(132 p.)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-02, Section: B.
- 주기사항
- Advisor: Yu, Dong.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Davis, 2023.
- 사용제한주기
- This item must not be sold to any third party vendors.
- 초록/해제
- 요약We investigated temperature and gate-dependent photo-generated carrier diffusion in single-crystal microstructures of the hybrid organic-inorganic perovskite (HOIP) methylammonium lead trihalide (MAPbX3, where X = I, Br) via scanning photocurrent microscopy (SPCM). In both materials, carrier diffusion lengths (LD) were found to increase abruptly across the tetragonal to orthorhombic phase transition, coincident with an abrupt increase in exciton binding energy (EB), and reached over 100 µm by 80 K. Combined with relatively short carrier lifetimes, the low temperature LD measurements implied an enormous carrier mobility (∼ 104 V s/cm2 ) in both materials, too high in fact to be typical electron or hole diffusion. Thus, we attributed this fascinating behavior to fast, efficient transport of charge neutral excitons, where the dipolar nature of the excitons massively reduces their optical phonon scattering, allowing them to diffuse unhindered through these materials.We also discovered the ability to tune the low temperature exciton diffusion via an applied gate voltage (VG). Depending on the material, as well as the sign and magnitude of VG, LD could be increased or decreased by a significant margin. In addition, MAPbBr3's intrinsically larger EB made this value directly observable through photocurrent spectroscopy. The measured EB values were temperature-dependent (EB increased as T decreased) with the sharpest change occurring at the low temperature phase transition. Finally, we branched out from our HOIP studies to investigate polarization-dependent anisotropic photoluminescence of self-trapped excitons (STEs) in the one-dimensional (1D) organic metal halide hybrid (OMHH) C4N2H14PbBr4. 1D materials can exhibit strongly anisotropic optical properties and highly efficient light emission, making them promising candidates for novel photodetection and lighting applications. We discovered that the sample emission intensity can shift between being maximum under parallel-to-1D chain versus perpendicular-to-1D chain excitation, depending on the excitation wavelength (λEX). We attributed this λEX-dependent emission to fast surface recombination, supported by firstprinciples calculations of optical absorption and a fast emission decay component seen with time-resolved photoluminescence (TRPL) only when absorption was located near the surface.
- 일반주제명
- Physical chemistry.
- 일반주제명
- Applied physics.
- 키워드
- Anisotropy
- 키워드
- Excitons
- 키워드
- Metal halide
- 기타저자
- University of California, Davis Physics
- 기본자료저록
- Dissertations Abstracts International. 85-02B.
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008240612s2023 us |||||||||||||||c||eng d■001000016932968
■00520240214101146
■006m o d
■007cr#unu||||||||
■020 ▼a9798379999476
■035 ▼a(MiAaPQ)AAI30522564
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a530
■1001 ▼aMcClintock, Luke.
■24510▼aExciton Effects in Hybrid Organic-Inorganic Perovskites and One-Dimensional Organic Metal Halide Hybrids▼h[electronic resource]
■260 ▼a[S.l.]:▼bUniversity of California, Davis. ▼c2023
■260 1▼aAnn Arbor :▼bProQuest Dissertations & Theses, ▼c2023
■300 ▼a1 online resource(132 p.)
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-02, Section: B.
■500 ▼aAdvisor: Yu, Dong.
■5021 ▼aThesis (Ph.D.)--University of California, Davis, 2023.
■506 ▼aThis item must not be sold to any third party vendors.
■520 ▼aWe investigated temperature and gate-dependent photo-generated carrier diffusion in single-crystal microstructures of the hybrid organic-inorganic perovskite (HOIP) methylammonium lead trihalide (MAPbX3, where X = I, Br) via scanning photocurrent microscopy (SPCM). In both materials, carrier diffusion lengths (LD) were found to increase abruptly across the tetragonal to orthorhombic phase transition, coincident with an abrupt increase in exciton binding energy (EB), and reached over 100 µm by 80 K. Combined with relatively short carrier lifetimes, the low temperature LD measurements implied an enormous carrier mobility (∼ 104 V s/cm2 ) in both materials, too high in fact to be typical electron or hole diffusion. Thus, we attributed this fascinating behavior to fast, efficient transport of charge neutral excitons, where the dipolar nature of the excitons massively reduces their optical phonon scattering, allowing them to diffuse unhindered through these materials.We also discovered the ability to tune the low temperature exciton diffusion via an applied gate voltage (VG). Depending on the material, as well as the sign and magnitude of VG, LD could be increased or decreased by a significant margin. In addition, MAPbBr3's intrinsically larger EB made this value directly observable through photocurrent spectroscopy. The measured EB values were temperature-dependent (EB increased as T decreased) with the sharpest change occurring at the low temperature phase transition. Finally, we branched out from our HOIP studies to investigate polarization-dependent anisotropic photoluminescence of self-trapped excitons (STEs) in the one-dimensional (1D) organic metal halide hybrid (OMHH) C4N2H14PbBr4. 1D materials can exhibit strongly anisotropic optical properties and highly efficient light emission, making them promising candidates for novel photodetection and lighting applications. We discovered that the sample emission intensity can shift between being maximum under parallel-to-1D chain versus perpendicular-to-1D chain excitation, depending on the excitation wavelength (λEX). We attributed this λEX-dependent emission to fast surface recombination, supported by firstprinciples calculations of optical absorption and a fast emission decay component seen with time-resolved photoluminescence (TRPL) only when absorption was located near the surface.
■590 ▼aSchool code: 0029.
■650 4▼aCondensed matter physics.
■650 4▼aPhysical chemistry.
■650 4▼aApplied physics.
■653 ▼aAnisotropy
■653 ▼aExcitons
■653 ▼aHalide perovskite
■653 ▼aMetal halide
■653 ▼aOptical phonon scattering
■690 ▼a0611
■690 ▼a0494
■690 ▼a0215
■71020▼aUniversity of California, Davis▼bPhysics.
■7730 ▼tDissertations Abstracts International▼g85-02B.
■773 ▼tDissertation Abstract International
■790 ▼a0029
■791 ▼aPh.D.
■792 ▼a2023
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16932968▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a202402▼f2024
