본문

Anion Diffusion in Two-Dimensional Halide Perovskites- [electronic resource]
Anion Diffusion in Two-Dimensional Halide Perovskites - [electronic resource]
내용보기
Anion Diffusion in Two-Dimensional Halide Perovskites- [electronic resource]
자료유형  
 학위논문파일 국외
최종처리일시  
20240214101126
ISBN  
9798379842109
DDC  
629.8
저자명  
Akriti.
서명/저자  
Anion Diffusion in Two-Dimensional Halide Perovskites - [electronic resource]
발행사항  
[S.l.]: : Purdue University., 2022
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2022
형태사항  
1 online resource(139 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-01, Section: B.
주기사항  
Advisor: Dou, Letian.
학위논문주기  
Thesis (Ph.D.)--Purdue University, 2022.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약Technological advancements in electronics industry are driven by innovations in device fabrication techniques and development of novel materials. Halide perovskites are one of the latest additions to the semiconductor family. The performance of solid-state devices based on halide perovskites is now competing with other well-established semiconductors like silicon and gallium arsenide. However, the intrinsic instability of three-dimensional (3D) perovskites poses a great challenge in their widespread commercialization. The soft crystal lattice of hybrid halide perovskites facilitates anionic diffusion which impacts material stability, optoelectronic properties, and solid-state device performance.Two-dimensional (2D) halide perovskites with organic capping layers have been used for improving the extrinsic stability as well as suppressing intrinsic anionic diffusion. Nevertheless, a fundamental understanding of the role of compositional tuning, especially the impact of organic cations, in inhibiting anionic diffusion across the perovskite-ligand interface is missing. In our research, we first developed a library of atomically sharp and flat 2D heterostructures between two arbitrarily determined phase-pure halide perovskite single crystals. This platform was then used to perform a systematic investigation of anionic diffusion mechanism and quantify the impact of structural components on anionic inter-diffusion in halide perovskites.Stark differences were observed in anionic diffusion across 2D halide perovskite lateral and vertical heterostructures. Halide inter-diffusion in lateral heterostructures was found to be similar to the classical Fickian diffusion featuring continuous concentration profile evolution. However, vertical heterostructures show a "quantized" layer-by-layer diffusion behavior governed by a local free energy minimum and ion-blocking effects of the organic cations. For both lateral and vertical migrations, halide diffusion was found to be faster in perovskites with larger inorganic layer thickness. The increment becomes less apparent as the inorganic layer thickness increases, akin to the quantum confinement effect observed for band gaps. Furthermore, we found that bulkier and more rigid π-conjugated organic cations inhibit halide inter-diffusion much more effectively compared to short chain aliphatic cations. These results offer significant insights into the mechanism of anionic diffusion in 2D perovskites and provide a new materials platform for heterostructure assembly and device integration.
일반주제명  
Technological change.
일반주제명  
Semiconductors.
일반주제명  
Ions.
일반주제명  
Gallium arsenide.
일반주제명  
Light emitting diodes.
일반주제명  
Homogenization.
일반주제명  
Energy.
일반주제명  
Research & development--R&D.
일반주제명  
Photocatalysis.
일반주제명  
Thin films.
일반주제명  
Scanning electron microscopy.
일반주제명  
Transmission electron microscopy.
일반주제명  
Monte Carlo simulation.
일반주제명  
Iodine.
일반주제명  
Materials science.
일반주제명  
Lasers.
일반주제명  
Polymethyl methacrylate.
일반주제명  
Nanocrystals.
일반주제명  
Quantum dots.
일반주제명  
Analytical chemistry.
일반주제명  
Chemistry.
일반주제명  
Condensed matter physics.
일반주제명  
Electrical engineering.
일반주제명  
Optics.
일반주제명  
Physical chemistry.
일반주제명  
Physics.
일반주제명  
Polymer chemistry.
일반주제명  
Quantum physics.
기타저자  
Purdue University.
기본자료저록  
Dissertations Abstracts International. 85-01B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.
신착도서 더보기
최근 3년간 통계입니다.

소장정보

  • 예약
  • 소재불명신고
  • 나의폴더
  • 우선정리요청
  • 비도서대출신청
  • 야간 도서대출신청
소장자료
등록번호 청구기호 소장처 대출가능여부 대출정보
TF06878 전자도서
마이폴더 부재도서신고 비도서대출신청

* 대출중인 자료에 한하여 예약이 가능합니다. 예약을 원하시면 예약버튼을 클릭하십시오.

해당 도서를 다른 이용자가 함께 대출한 도서

관련 인기도서

로그인 후 이용 가능합니다.