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Chemical Control of Semiconductor Surface: XPS and STM
Chemical Control of Semiconductor Surface: XPS and STM
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152716
- ISBN
- 9798384053668
- DDC
- 541
- 서명/저자
- Chemical Control of Semiconductor Surface: XPS and STM
- 발행사항
- [Sl] : Cornell University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 104 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Hines, Melissa.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2024.
- 초록/해제
- 요약The chemical and physical control of semiconductor surfaces is crucial for various applications, including the performance enhancement of field-effect transistors, photocatalysts, and photocathodes. Despite significant advancements, there remains a need for in-depth research on various surface processes and characteristics of semiconductors. This thesis concentrates on the surface control of semiconductor photocatalysts and photocathodes, utilizing X-ray photoelectron spectroscopy and scanning tunneling microscopy.Investigation into the surface fluorination mechanism of rutile TiO2 (110) was performed. A mechanism akin to the Cabrera-Mott theory was proposed, where fluorination reduces surface charge density and induces an electric field. This field causes Ti cations to migrate to the surface, where they react with XeF2 and O2. Surface fluorination results in an atomically clean and non-stick surface, both before and after water rinsing. Additionally, this fluorination reaction is photo-switchable due to the photocatalyzed removal of the TiO2 surface carboxylate layer.Furthermore, the development of a method to protect photocathodes with atomically thin coatings, such as single-layer graphene and hexagonal boron nitride, was discussed. The feasibility of this method was proved by fabricating protected Mg photocathodes and detecting photoelectrons through the graphene layer. However, extending this approach to protect Cs3Sb photocathodes presented challenges, including the creation of clean substrates for photocathode growth and the nucleation of Cs3Sb on graphene and hexagonal boron nitride. These challenges require further investigation.Additionally, the surface chemistry of CsI-activated GaAs was investigated. Contrary to the conventional "yo-yo" activation method, the most stable oxide of Cs, Cs2O, was absent from the surface after annealing. Cs suboxides, such as Cs2O2 and CsO2, which possess lower work functions than Cs2O, were present in the activation layer. This hypothesis suggests a promising activation method for GaAs, potentially avoiding the formation of high work function Cs2O.
- 일반주제명
- Physical chemistry
- 일반주제명
- Materials science
- 일반주제명
- Condensed matter physics
- 일반주제명
- Inorganic chemistry
- 일반주제명
- Analytical chemistry
- 키워드
- Photocatalyst
- 키워드
- Photocathode
- 키워드
- Semiconductors
- 키워드
- Surface science
- 기타저자
- Cornell University Chemistry and Chemical Biology
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152716
■006m o d
■007cr#unu||||||||
■020 ▼a9798384053668
■035 ▼a(MiAaPQ)AAI31489133
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a541
■1001 ▼aZhu, Qingyuan Amy.▼0(orcid)0000-0002-2607-1849
■24510▼aChemical Control of Semiconductor Surface: XPS and STM
■260 ▼a[Sl]▼bCornell University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a104 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Hines, Melissa.
■5021 ▼aThesis (Ph.D.)--Cornell University, 2024.
■520 ▼aThe chemical and physical control of semiconductor surfaces is crucial for various applications, including the performance enhancement of field-effect transistors, photocatalysts, and photocathodes. Despite significant advancements, there remains a need for in-depth research on various surface processes and characteristics of semiconductors. This thesis concentrates on the surface control of semiconductor photocatalysts and photocathodes, utilizing X-ray photoelectron spectroscopy and scanning tunneling microscopy.Investigation into the surface fluorination mechanism of rutile TiO2 (110) was performed. A mechanism akin to the Cabrera-Mott theory was proposed, where fluorination reduces surface charge density and induces an electric field. This field causes Ti cations to migrate to the surface, where they react with XeF2 and O2. Surface fluorination results in an atomically clean and non-stick surface, both before and after water rinsing. Additionally, this fluorination reaction is photo-switchable due to the photocatalyzed removal of the TiO2 surface carboxylate layer.Furthermore, the development of a method to protect photocathodes with atomically thin coatings, such as single-layer graphene and hexagonal boron nitride, was discussed. The feasibility of this method was proved by fabricating protected Mg photocathodes and detecting photoelectrons through the graphene layer. However, extending this approach to protect Cs3Sb photocathodes presented challenges, including the creation of clean substrates for photocathode growth and the nucleation of Cs3Sb on graphene and hexagonal boron nitride. These challenges require further investigation.Additionally, the surface chemistry of CsI-activated GaAs was investigated. Contrary to the conventional "yo-yo" activation method, the most stable oxide of Cs, Cs2O, was absent from the surface after annealing. Cs suboxides, such as Cs2O2 and CsO2, which possess lower work functions than Cs2O, were present in the activation layer. This hypothesis suggests a promising activation method for GaAs, potentially avoiding the formation of high work function Cs2O.
■590 ▼aSchool code: 0058.
■650 4▼aPhysical chemistry
■650 4▼aMaterials science
■650 4▼aCondensed matter physics
■650 4▼aInorganic chemistry
■650 4▼aAnalytical chemistry
■653 ▼aPhotocatalyst
■653 ▼aPhotocathode
■653 ▼aScanning tunneling microscopy
■653 ▼aSemiconductors
■653 ▼aSurface science
■653 ▼aX-ray photoelectron spectroscopy
■690 ▼a0494
■690 ▼a0794
■690 ▼a0488
■690 ▼a0486
■690 ▼a0611
■71020▼aCornell University▼bChemistry and Chemical Biology.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0058
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163502▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
