BaSnO3 as a Transparent Mixed Ionic-Electronic Conducting Material - Utilizing Novel In Situ Methods to Advance Understanding of Structure-Processing-Property Relations

BaSnO3 作为透明混合离子电子导电材料 - 利用新颖的原位方法促进对结构-加工-性能关系的理解

• 批准号: 1507047
• 负责人: Harry Tuller
• 金额: $ 56.4万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-15 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1507047&HistoricalAwards=false
• 关键词: BaSnO3; Transparent; Mixed; Ionic; Electronic

NON-TECHNICAL DESCRIPTION: Barium tin oxide (BaSnO3) is a remarkable new material and a prime candidate for the much-needed replacement of low-abundance, but presently critical indium-based transparent electrodes for solar cell and display technologies. Additionally, this material, when appropriately chemically modified, is well-suited to serve as a model system for studying the role of defects in influencing the performance of mixed ionic-electronic conducting electrodes in, for example, solid oxide fuel cells, noted for their high chemical-to-electrical energy conversion efficiencies. Novel in situ high temperature measurements are being employed to explore defect formation and transport and the effects of microstructure on the electrical, electrochemical and optical properties of barium tin oxide, as well as exploring and optimizing its thin film growth. Insights gained will aid in developing more robust transparent and mixed conductive electrodes for solar and fuel cell applications and generally provide critical insights into how variations in growth parameters impact the chemistry and morphology of functional thin films and thereby their properties. A science, technology, engineering & mathematics (STEM) project-based course for high school students, drawn from both inner city and suburban schools, with a focus on minority and female students, is developed and implemented, in conjunction with a high school teacher/ teacher-training faculty member, on the topic of clean energy and environmental technologies, to improve their scientific understanding of pressing global issues and stimulate them to consider STEM careers. Research internships, are offered to undergraduate students from the science and engineering disciplines, to provide them with the opportunity to experience research in action. TECHNICAL DETAILS: The electrical, electrochemical and optical behavior of acceptor- and donor-doped barium tin oxide, a prime candidate for the much needed replacement of low-abundance transparent electrodes for solar cells, are being investigated over a wide range of temperature and oxygen partial pressure. Novel in situ characterization methods allow for development of quantitative defect and transport models for donor- and acceptor-doped materials, vital steps towards their practical utilization as a transparent or mixed ionic-electronic conducting materials. A novel method for monitoring film growth in situ will allow for the efficient optimization of film growth, microstructure and properties of these, and ultimately all physical vapor deposited films, with respect to deposition conditions. Additional focus is placed on quantifying and explaining the significant impact of grain boundaries on the effective electron mobility of transparent conductive barium tin oxide. This research approach provides an excellent opportunity for the designated graduate student to learn cutting edge experimental and modeling techniques and gain a broader appreciation of how materials research can address society's major challenges.

非技术描述：钡锡氧化物（BaSnO 3）是一种引人注目的新材料，是太阳能电池和显示技术中急需替代低丰度但目前至关重要的铟基透明电极的主要候选材料。此外，当适当地化学改性时，该材料非常适合用作研究缺陷在影响例如固体氧化物燃料电池中的混合离子-电子导电电极的性能中的作用的模型系统，所述固体氧化物燃料电池以其高的化学-电能转换效率而闻名。新的原位高温测量正在被用来探索缺陷的形成和传输以及微观结构对钡锡氧化物的电学、电化学和光学性能的影响，以及探索和优化其薄膜生长。获得的见解将有助于开发更强大的透明和混合导电电极的太阳能和燃料电池应用，并提供关键的见解如何在生长参数的变化影响功能薄膜的化学和形态，从而其性能。与一名高中教师/教师培训教员合作，为来自市中心和郊区学校的高中生制定和实施了一个以科学、技术、工程数学为基础的项目课程，重点是少数民族和女生，主题是清洁能源和环境技术，以提高他们对紧迫的全球问题的科学理解，并鼓励他们考虑从事科学、技术、工程数学职业。研究实习，提供给科学和工程学科的本科生，为他们提供体验研究的机会。 技术规格：电子，电化学和光学行为的受体和施主掺杂的钡锡氧化物，一个主要的候选人，急需更换低丰度的透明电极的太阳能电池，正在研究在很宽的温度和氧分压范围。新的原位表征方法允许开发定量缺陷和输运模型的施主和受主掺杂的材料，其实际利用的重要步骤作为一个透明的或混合的离子电子导电材料。一种用于原位监测膜生长的新方法将允许相对于沉积条件有效地优化膜生长、这些的微结构和性质，并且最终优化所有物理气相沉积膜。额外的重点放在量化和解释的显着影响的晶界上的有效电子迁移率的透明导电钡锡氧化物。这种研究方法为指定的研究生提供了一个很好的机会，可以学习尖端的实验和建模技术，并更广泛地了解材料研究如何解决社会的主要挑战。