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Metal Halide Perovskite Nanostructures for Optoelectronic Applications and Fundamental Studies
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Metal Halide Perovskite Nanostructures for Optoelectronic Applications and Fundamental Studies. |
| 개인저자 | Fu, Yongping. |
| 단체저자명 | The University of Wisconsin - Madison. Chemistry. |
| 발행사항 | [S.l.]: The University of Wisconsin - Madison., 2018. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2018. |
| 형태사항 | 408 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-04B. Dissertation Abstract International |
| ISBN | 9781687972903 |
| 학위논문주기 | Thesis (Ph.D.)--The University of Wisconsin - Madison, 2018. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-04, Section: B.
Advisor: Jin, Song. |
| 이용제한사항 | This item must not be sold to any third party vendors.This item must not be added to any third party search indexes. |
| 요약 | Semiconductor nanostructures are of both fundamental and technological interests, because of the emergence of fascinating optical, electrical, and mechanical properties not seen in their bulk counterparts. For instance, quantum confinement effect and increased surface area lead to a myriad of new properties at the nanoscale. The properties of nanostructures exhibit dimensionality and size dependence, leading to new physical phenomena, functionalities, and applications. Examples include one-dimensional (1D) nanowires (NWs) and two-dimensional (2D) quantum wells (QWs) of conventional inorganic semiconductors (e.g. elemental, III-V, metal chalcogenides, etc.) that have revolutionized technological applications such as nanoscale electronic, optoelectronic and photonic devices, biosensors, renewable energy conversion, and energy storage.The rational and controlled synthesis of new semiconductor nanostructures can lead to novel physical properties, better device performance, and new areas for exploration. Recently, lead halide perovskites have excited the photovoltaic solar material research community due to their high solar conversion efficiencies and ease of solution processing. My graduate research is focused on: (1) the rational design, synthesis, and characterizations of single-crystal nanostructures of diverse families of perovskite materials with different compositions and dimensionalities with different properties |
| 요약 | The key for the success in making these heterojunction is that the self-assembled bilayer of RNH3+ cations can act as natural diffusion barrier and prevent ion migration across the adjacent perovskite layers, maintaining stable and atomically sharp perovskite junctions. The heterostructures display distinctive PL peaks from the individual layers exhibiting different degrees of quantum confinement, and their effective emission color can be readily tuned by excitation power density. Time-resolved photoluminescence studies of individual heterostructures reveal internal energy transfer with a timescale of hundreds of picoseconds from lower-n to higher-n layers (high bandgap to low bandgap). These heterostructures capable of emitting multiple colors with high spectral purity are attractive platforms to explore new properties and physics in 2D materials. They also show promise for building versatile photonic devices that are easily solution-processed.The following appendices provide complementary information to the accomplished work presented in the main chapters. Specifically, Appendix A-H provide additional figures and tables to Chapters 2-9, respectively. Appendix I describes electrically driven light emission from 1D NWs and 2D nanoplates of cesium lead halide perovskitesThe remarkable solar performance of lead halide perovskites has been attributed to their advantageous physical properties that present many mysteries, challenges, as well as opportunities. The body of thesis here has demonstrated better control over the crystal growth and rational design of nanostructures of these fascinating materials, as well as better understanding of their complex solid-state chemistry can further enhance their applications. Moreover, the excellent properties of these single-crystal perovskite nanostructures (and their heterostructures) of diverse families of perovskite materials with different cations, anions, and dimensionality make them ideal for fundamental physical studies of carrier transport and decay mechanisms, and for enabling high performance optoelectronic applications, such as NW lasers. |
| 일반주제명 | Chemistry. |
| 언어 | 영어 |
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