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Structural Dynamics and Ion Migration in 2D/3D Lead-Halide Perovskite Interfaces
Structural Dynamics and Ion Migration in 2D/3D Lead-Halide Perovskite Interfaces
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105123
- ISBN
- 9798293899517
- DDC
- 620.11
- 서명/저자
- Structural Dynamics and Ion Migration in 2D/3D Lead-Halide Perovskite Interfaces
- 발행사항
- [Sl] : Princeton University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 167 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 주기사항
- Advisor: Loo, Yueh-Lin.
- 학위논문주기
- Thesis (Ph.D.)--Princeton University, 2025.
- 초록/해제
- 요약Lead-halide perovskite solar cells (PSCs) have emerged as a promising technology for low-cost renewable energy generation. Recently, most high-performance PSCs employ 3D perovskite absorbers with thin 2D perovskite interfacial layers to passivate surface defects. However, these 2D/3D heterostructures can structurally evolve under heat or illumination, compromising PSC stability. Specifically, the 2D perovskite, comprising alternating planes of corner-sharing lead-halide octahedra and organic spacer cations, often transforms from a distribution of low-n phases (n denotes number of octahedral layers between adjacent spacer cation layers) to higher-n phases, with eventual "dissolution" so only the underlying 3D perovskite is detectable. Design rules for stable heterostructures and thorough understanding of the driving forces behind such transformations are lacking.In this thesis, we used in-situ X-ray diffraction and photoluminescence measurements to monitor structural transformations of 2D/3D perovskites comprising alkylammonium spacer cations. We demonstrate that use of larger spacer cations leads to slower structural transformations. Furthermore, temperature-dependent photoluminescence measurements show that 2D perovskites comprising monoammonium spacer cations exhibit lower activation energies for structural transformation than their diammonium-based counterparts. Using density functional theory and Monte Carlo transport simulations, we find that these transformations are primarily driven by cation concentration gradients across the 2D/3D perovskite interface, with the formation energies of n-phase perovskites determining the distribution of n-phases during cation diffusion. This insight underscores the importance of kinetic stabilization methods, such as use of diammonium spacer cations, to retard diffusion and stabilize 2D/3D perovskite structures.Finally, we studied the ability of 2D perovskites to inhibit iodine transport, as iodine is known to diffuse out of perovskite layers and participate in detrimental reactions with adjacent solar cell materials. Here, temperature-dependent ionic conductivity measurements of 2D perovskites and molecular dynamics simulations show that longer, more rigid, and bulkier spacer cations increase the energetic barrier for iodide migration. We measured the extent of iodine leaching from 2D/3D perovskites using X-ray photoelectron spectroscopy and found that while longer spacer cations more effectively suppress iodine transport, they do not fully eliminate it. These insights provide design rules for developing 2D/3D perovskite heterostructures with large barriers for iodine migration to enable efficient and stable PSCs.
- 일반주제명
- Materials science
- 일반주제명
- Physical chemistry
- 일반주제명
- Alternative energy
- 일반주제명
- Analytical chemistry
- 키워드
- 2D perovskites
- 키워드
- Perovskite
- 키워드
- Photovoltaics
- 기타저자
- Princeton University Electrical and Computer Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798293899517
■035 ▼a(MiAaPQ)AAI32238583
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620.11
■1001 ▼aKaplan, Alan Benjamin.▼0(orcid)0000-0002-0778-8043
■24510▼aStructural Dynamics and Ion Migration in 2D/3D Lead-Halide Perovskite Interfaces
■260 ▼a[Sl]▼bPrinceton University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a167 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Loo, Yueh-Lin.
■5021 ▼aThesis (Ph.D.)--Princeton University, 2025.
■520 ▼aLead-halide perovskite solar cells (PSCs) have emerged as a promising technology for low-cost renewable energy generation. Recently, most high-performance PSCs employ 3D perovskite absorbers with thin 2D perovskite interfacial layers to passivate surface defects. However, these 2D/3D heterostructures can structurally evolve under heat or illumination, compromising PSC stability. Specifically, the 2D perovskite, comprising alternating planes of corner-sharing lead-halide octahedra and organic spacer cations, often transforms from a distribution of low-n phases (n denotes number of octahedral layers between adjacent spacer cation layers) to higher-n phases, with eventual "dissolution" so only the underlying 3D perovskite is detectable. Design rules for stable heterostructures and thorough understanding of the driving forces behind such transformations are lacking.In this thesis, we used in-situ X-ray diffraction and photoluminescence measurements to monitor structural transformations of 2D/3D perovskites comprising alkylammonium spacer cations. We demonstrate that use of larger spacer cations leads to slower structural transformations. Furthermore, temperature-dependent photoluminescence measurements show that 2D perovskites comprising monoammonium spacer cations exhibit lower activation energies for structural transformation than their diammonium-based counterparts. Using density functional theory and Monte Carlo transport simulations, we find that these transformations are primarily driven by cation concentration gradients across the 2D/3D perovskite interface, with the formation energies of n-phase perovskites determining the distribution of n-phases during cation diffusion. This insight underscores the importance of kinetic stabilization methods, such as use of diammonium spacer cations, to retard diffusion and stabilize 2D/3D perovskite structures.Finally, we studied the ability of 2D perovskites to inhibit iodine transport, as iodine is known to diffuse out of perovskite layers and participate in detrimental reactions with adjacent solar cell materials. Here, temperature-dependent ionic conductivity measurements of 2D perovskites and molecular dynamics simulations show that longer, more rigid, and bulkier spacer cations increase the energetic barrier for iodide migration. We measured the extent of iodine leaching from 2D/3D perovskites using X-ray photoelectron spectroscopy and found that while longer spacer cations more effectively suppress iodine transport, they do not fully eliminate it. These insights provide design rules for developing 2D/3D perovskite heterostructures with large barriers for iodine migration to enable efficient and stable PSCs.
■590 ▼aSchool code: 0181.
■650 4▼aMaterials science
■650 4▼aPhysical chemistry
■650 4▼aAlternative energy
■650 4▼aAnalytical chemistry
■653 ▼a2D perovskites
■653 ▼aPerovskite
■653 ▼aPhotovoltaics
■653 ▼aLead-halide perovskite solar cells
■653 ▼aX-ray diffraction
■690 ▼a0794
■690 ▼a0486
■690 ▼a0363
■690 ▼a0494
■71020▼aPrinceton University▼bElectrical and Computer Engineering.
■7730 ▼tDissertations Abstracts International▼g87-04B.
■790 ▼a0181
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359471▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


