GOALI: Toward Improving Quality and Yield of Large-Area, Single-Crystal Sapphire Wafers via Fundamental Understanding of Bubble Engulfment During Growth

目标：通过对生长过程中气泡吞噬的基本了解，提高大面积单晶蓝宝石晶圆的质量和产量

基本信息

批准号：
1760689
负责人：
Jeffrey Derby
金额：
$ 40.31万
依托单位：
University of Minnesota-Twin Cities
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-07-01 至 2023-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1760689&HistoricalAwards=false
关键词：
GOALI Toward Improving Quality Yield

项目摘要

Single-crystal sapphire has numerous potential applications ranging from armor to electronics. The cost of this material is dependent on the cost of processing, which is complicated by the presence of bubbles during growth of the crystal. A fundamental understanding of the behavior of bubbles during the growth of single-crystal sapphire is needed to enable the manufacture of high-performance materials at a low cost. This Grant Opportunities for Academic Liaison with Industry (GOALI) award supports fundamental research to understand the mechanisms of bubble growth and diffusion in sapphire single crystals. Computational models of the process will be developed to describe the formation and motion of these bubbles during the growth process, and provide insight for strategies to eliminate these defects. The work?will be carried out in consultation with GOALI partner, Crystal Systems?Innovations, LLC, who will provide?valuable, practical insight and supporting?sapphire crystal growth experiments.??New knowledge from this work has relevance to the?manufacturing of?single-crystal sapphire material, and has benefits in potential applications including transparent armor for national defense applications, touch-screen?faceplates in smart?phones, and substrates for the fabrication of energy-saving white?light-emitting-diodes (LEDs).??This?project?will fund the training of a graduate student who will be?proficient in multi-disciplinary and?technologically relevant issues involving?advanced manufacturing, materials engineering and processing,?and crystal?growth.In this research program, investigators will?develop, validate, and apply computational models to elucidate the?mechanisms?of bubble inclusion during sapphire crystal growth. This research will build?upon prior steady-state and dynamic models at the continuum level that have?been developed to study the physical mechanisms?that determine the pushing or?engulfment of a solid particle at a moving, solid-liquid interface. These?studies?will be carried out in consultation with GOALI partner, Crystal Systems?Innovations, LLC, who will provide?valuable, practical insight and supporting?sapphire crystal growth experiments.??This work will probe the?fundamental mechanisms by which bubbles?are engulfed during solidification, which is a particularly?challenging problem?associated with sapphire crystal growth. In addition to addressing the?underlying?scientific phenomena of heat transfer, fluid mechanics, phase?change, and particle-solidification front?interactions, a computational?approach of unprecedented rigor and accuracy will be developed to probe?nonlinear and dynamical aspects of these extremely complex phenomena.?Finally, a?deeper understanding of bubble and particle?engulfment phenomena during solidification will impact other?areas as diverse?as geological materials, reinforced metal-ceramic composites, multi-crystalline?silicon, and?biological cryo-preservation processes.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

单晶蓝宝石具有从盔甲到电子设备的许多潜在应用。该材料的成本取决于加工的成本，这在晶体生长过程中存在气泡而变得复杂。需要对单晶蓝宝石增长过程中气泡行为的基本了解，以便以低成本的形式制造高性能材料。这项与行业联络的赠款机会（Goali奖）支持基本研究，以了解蓝宝石单晶泡沫增长和扩散的机制。将开发该过程的计算模型，以描述这些气泡在增长过程中的形成和运动，并为消除这些缺陷提供了见解。这项工作？将与目标合作伙伴，水晶系统？创新，有限责任公司协商，谁会提供？有价值，实用的见解和支持？蓝宝石水晶增长实验。制造节能白色的基材（LED）。蓝宝石晶体生长。这项研究将建立在现有的稳态和动态模型的基础上，这些模型已开发出来，以研究物理机制？确定在移动的固体液体界面上推动或吞噬固体粒子的物理机制。这些研究？将与目标合作伙伴，水晶系统？创新有限责任公司协商，谁会提供？有价值，实用的洞察力和支持？蓝宝石水晶增长实验。？除了解决传热的基础科学现象，流体力学，相位的变化和粒子固化的前沿吗？相互作用，一种计算？一种未经前所未有的严格性和准确性的计算方法，以探测非线性和动态方面？这些极其复杂的领域是对气泡和粒子的更深入的地理学吗？材料，增强的金属陶瓷复合材料，多晶体硅和“生物冷冻保护过程”。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力优点和更广泛的影响来通过评估来支持的。