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Photoinduced Transfer of Spin-Polarized Charges at Semiconductor Interfaces
Photoinduced Transfer of Spin-Polarized Charges at Semiconductor Interfaces
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151513
- ISBN
- 9798383045138
- DDC
- 541
- 저자명
- Liu, Yufeng.
- 서명/저자
- Photoinduced Transfer of Spin-Polarized Charges at Semiconductor Interfaces
- 발행사항
- [Sl] : Columbia University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 111 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
- 주기사항
- Advisor: Zhu, Xiaoyang.
- 학위논문주기
- Thesis (Ph.D.)--Columbia University, 2024.
- 초록/해제
- 요약Charge transfer at the organic/inorganic semiconductor interfaces lies at the heart of interfacial photochemistry. While decades of research have shaped the current understanding that interfacial charge transfer depends crucially on energetic driving force and electronic coupling, much less is known about the role played by the spin degree of freedom. In particular, it is not clear how spin states evolve during the charge transfer process. With the advent of group 6 transition metal dichalcogenides (TMDC), a class of two-dimensional layered materials which permits the optical generation of spin-polarized electron-hole pairs in the monolayer limit, we now have the opportunity to investigate if charge transfer at an organic/inorganic interface could enable the transfer of spin polarization. Using time-resolved Faraday rotation and transient absorption spectroscopy, it is found in the MoSe2/H2Pc and C60/WS2 heterostructures that the photoinduced hole transfer from MoSe2 to H2Pc and electron transfer from WS2 to C60 results in spin polarization lifetimes one order of magnitude longer than that of a monolayer. In the WS2/MoSe2/H2Pc heterostructure, the addition of a WS2 monolayer drives the dissociation of electron-hole pairs bound at the MoSe2/H2Pc interface and leads to the observation of nanosecond-long spin polarization at room temperature. These findings evidence the photoinduced transfer of spin polarization, a mechanism which could potentially be exploited to enhance the efficiency and selectivity of photochemical reactions involving angular momentum change, and may be generalized to other organic/inorganic interfaces composed of crystalline semiconductors with spin-momentum locking.
- 일반주제명
- Physical chemistry
- 일반주제명
- Materials science
- 일반주제명
- Condensed matter physics
- 일반주제명
- Optics
- 키워드
- Charge transfer
- 키워드
- Heterostructures
- 기타저자
- Columbia University Chemical Physics
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151513
■006m o d
■007cr#unu||||||||
■020 ▼a9798383045138
■035 ▼a(MiAaPQ)AAI31300140
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a541
■1001 ▼aLiu, Yufeng.
■24510▼aPhotoinduced Transfer of Spin-Polarized Charges at Semiconductor Interfaces
■260 ▼a[Sl]▼bColumbia University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a111 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-12, Section: B.
■500 ▼aAdvisor: Zhu, Xiaoyang.
■5021 ▼aThesis (Ph.D.)--Columbia University, 2024.
■520 ▼aCharge transfer at the organic/inorganic semiconductor interfaces lies at the heart of interfacial photochemistry. While decades of research have shaped the current understanding that interfacial charge transfer depends crucially on energetic driving force and electronic coupling, much less is known about the role played by the spin degree of freedom. In particular, it is not clear how spin states evolve during the charge transfer process. With the advent of group 6 transition metal dichalcogenides (TMDC), a class of two-dimensional layered materials which permits the optical generation of spin-polarized electron-hole pairs in the monolayer limit, we now have the opportunity to investigate if charge transfer at an organic/inorganic interface could enable the transfer of spin polarization. Using time-resolved Faraday rotation and transient absorption spectroscopy, it is found in the MoSe2/H2Pc and C60/WS2 heterostructures that the photoinduced hole transfer from MoSe2 to H2Pc and electron transfer from WS2 to C60 results in spin polarization lifetimes one order of magnitude longer than that of a monolayer. In the WS2/MoSe2/H2Pc heterostructure, the addition of a WS2 monolayer drives the dissociation of electron-hole pairs bound at the MoSe2/H2Pc interface and leads to the observation of nanosecond-long spin polarization at room temperature. These findings evidence the photoinduced transfer of spin polarization, a mechanism which could potentially be exploited to enhance the efficiency and selectivity of photochemical reactions involving angular momentum change, and may be generalized to other organic/inorganic interfaces composed of crystalline semiconductors with spin-momentum locking.
■590 ▼aSchool code: 0054.
■650 4▼aPhysical chemistry
■650 4▼aMaterials science
■650 4▼aCondensed matter physics
■650 4▼aOptics
■653 ▼aCharge transfer
■653 ▼aHeterostructures
■653 ▼aOptical spectroscopy
■653 ▼aOrganic semiconductors
■653 ▼aSpin polarization
■653 ▼aTransition metal dichalcogenides
■690 ▼a0494
■690 ▼a0794
■690 ▼a0752
■690 ▼a0611
■71020▼aColumbia University▼bChemical Physics.
■7730 ▼tDissertations Abstracts International▼g85-12B.
■790 ▼a0054
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162007▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
