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首页> 外文学位 >Part I: Structural Characterization of Doped Nanostructured Magnesium: Understanding Disorder for Enhanced Hydrogen Absorption Kinetics Part II: Synthesis, Film Deposition, and Characterization of Quaternary Metal Chalcogenide Nanocrystals for Photovoltai
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Part I: Structural Characterization of Doped Nanostructured Magnesium: Understanding Disorder for Enhanced Hydrogen Absorption Kinetics Part II: Synthesis, Film Deposition, and Characterization of Quaternary Metal Chalcogenide Nanocrystals for Photovoltai

机译：第一部分：掺杂的纳米结构镁的结构表征：了解增强氢吸收动力学的紊乱第二部分：用于光伏的第四级硫族化物纳米晶体的合成，薄膜沉积和表征

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摘要

The production, storage, and subsequent consumption of energy are at the foundation of all human activity and livelihood. The theme of this dissertation is the pursuit of fundamental understanding of the chemistry of materials that are used for energy production and storage. A strong emphasis is placed on a synthetic foundation that allows for systematic investigation into the fundamental chemistry that controls the applicable properties of the materials of interest. This dissertation is written in the "journals format" style---which is accepted by the Graduate School at Colorado State University---and is based on one peer-reviewed publication that has appeared in Chemistry of Materials as well as two manuscripts to be submitted, one to The Journal of Physical Chemistry C, and one to ACS Applied Materials and Interfaces. In order to create a context for these publications, Chapters 1 and 3 provide an overview of the motivations for the projects, and then continue to detail the initial synthetic investigations and considerations for the two projects.;In addition to recounting Mg nanocrystals synthetic refinement that was necessary for reproducible hydride kinetic analysis, Chapter 1 also briefly introduces some of the conventional models used for fitting of the hydriding kinetics data. Furthermore, initial investigations into the use of these models for our system are presented. Chapter 2 is a paper to be submitted to The Journal of Physical Chemistry C that describes the local and extended structure characterization of Mg nanocrystals (NCs) with a small amount of nickel added during synthesis. Ni has a dramatic effect on the de/hydriding kinetics of Mg NCs, and this chapter describes the use of a combination of multiple state-of-the-art characterization techniques to gain insight into the structural perturbations due to Ni inclusion in the Mg NCs. This insight is then used to establish the characteristics of Ni inclusion that results in the enhanced hydrogen absorption processes.;Chapter 3 introduces the many considerations needed to be taken into account during the development of a novel synthesis for copper zinc tin chalcogenide colloidal nanocrystals. In addition to introducing synthetic approaches to achieve this goal, Chapter 3 also describes essential characteristics that need to be considered for further investigation into the properties of films made from the nanocrystals. Chapter 4 is a publication that appeared in Chemistry of Materials, that describes an approach to tuning the surface and ligand chemistry of Cu2ZnSnS4 nanocrystals for use as an absorber layer in next generation photovoltaic devices. The publication describes ligand exchange chemistry achieved via layer-by-layer dip-casting of nanocrystal thin films, and the effects that this exchange chemistry has on the resulting films. It also details the fabrication of full photovoltaic (PV) devices to characterize the benefits of controlling the surface chemistry can have on PV performance. Chapter 5 is a paper---to be submitted to ACS Applied Materials and Interfaces---that describes the investigations into how varying the chalcogen ratio (i.e., S:Se) leads to changes in the physical and electrical properties of thin films made from Cu2ZnSn(S1-xSex)4 (where 0 < x < 1) NCs. It highlights the novel synthetic procedure (detailed in chapter 3) that was required for a systematic, deconvoluted evaluation of S:Se composition on the materials optical and electronic properties. Moreover, the characteristics of full PV devices based on thin films of each stoichiometry (x=0 to x=1) are assessed to establish a relationship between composition and the materials performance.
机译：能源的生产，存储和后续消耗是所有人类活动和生计的基础。本文的主题是追求对用于能源生产和存储的材料的化学性质的基本理解。高度重视合成基础，可以对控制所需材料的适用特性的基础化学进行系统研究。本论文以“期刊格式”的形式撰写-被科罗拉多州立大学的研究生院接受-并基于在《材料化学》上发表的一篇同行评议的出版物以及两篇手抄本提交给《物理化学杂志》 C，一项提交给ACS Applied Materials and Interfaces。为了为这些出版物创建背景，第1章和第3章概述了该项目的动机，然后继续详细介绍了这两个项目的初始合成研究和注意事项。对于可再生的氢化物动力学分析是必不可少的，第1章还简要介绍了一些用于拟合氢化动力学数据的常规模型。此外，介绍了对这些模型在我们系统中的使用的初步调查。第2章是提交给《物理化学杂志》的论文，描述了在合成过程中添加少量镍的Mg纳米晶体（NC）的局部和扩展结构表征。 Ni对Mg NCs的脱水动力学具有显着影响，本章介绍了多种最先进的表征技术的结合使用，以了解由于Mg NCs中包含Ni而引起的结构扰动。然后，将这种见解用于建立镍夹杂物的特性，从而导致增强的氢吸收过程。第三章介绍了在开发新型合成铜锌锡硫属化物胶体纳米晶体的过程中需要考虑的许多考虑因素。除了介绍实现此目标的合成方法外，第3章还介绍了进一步研究由纳米晶体制成的薄膜的特性时需要考虑的基本特征。第4章是发表在《材料化学》上的出版物，该出版物描述了一种用于调整Cu2ZnSnS4纳米晶体的表面和配体化学性质的方法，以用作下一代光伏器件的吸收层。该出版物描述了通过纳米晶体薄膜的逐层浸铸实现的配体交换化学，以及这种交换化学对所得膜的影响。它还详细介绍了完整光伏（PV）器件的制造过程，以表征控制表面化学性质对PV性能的好处。第5章是论文（将提交给ACS应用材料和界面），其中描述了对改变硫族元素比率（即S：Se）如何导致所制成薄膜的物理和电学性质变化的研究。来自Cu2ZnSn（S1-xSex）4（其中0

著录项

  • 作者

    Braun, Max B.;

  • 作者单位

    Colorado State University.;

  • 授予单位 Colorado State University.;
  • 学科 Inorganic chemistry.;Materials science.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 141 p.
  • 总页数 141
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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