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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.

单晶蓝宝石有许多潜在的应用，从装甲到电子产品。这种材料的成本取决于加工成本，而加工成本因晶体生长过程中气泡的存在而变得复杂。为了能够以低成本制造高性能材料，需要对单晶蓝宝石生长过程中气泡的行为有一个基本的了解。这一学术联系机会奖(GOALI)支持基础研究，以了解蓝宝石单晶中气泡生长和扩散的机制。将开发这一过程的计算模型，以描述这些气泡在生长过程中的形成和运动，并为消除这些缺陷的策略提供见解。这项工作将与Goali合作伙伴水晶系统创新有限责任公司协商进行，后者将提供有价值的、实用的见解和支持蓝宝石晶体生长实验。来自这项工作的新知识与单晶蓝宝石材料的制造有关，并在潜在应用方面有好处，包括国防应用的透明盔甲、智能手机中的触摸屏面板、和基板，用于制造节能的白色发光二极管(LED)。这个项目将资助一名研究生的培训，该研究生将精通多学科和技术相关问题，涉及先进制造、材料工程和加工以及晶体生长。在这个研究项目中，研究人员将开发、验证和应用计算模型来阐明蓝宝石晶体生长过程中气泡包裹体的机制。这项研究将建立在先前的连续介质水平的稳态和动态模型的基础上，这些模型已经被开发来研究确定固体颗粒在移动的固液界面上的推进或吞没的物理机制。这些研究将与Goali合作伙伴水晶系统创新有限责任公司协商进行，他们将提供有价值的、实用的见解和支持蓝宝石晶体生长实验。这项工作将探索在凝固过程中气泡被吞噬的基本机制，这是与蓝宝石晶体生长相关的一个特别具有挑战性的问题。除了解决潜在的传热学、流体力学、相变和颗粒-凝固前沿相互作用的科学现象外，还将开发一种前所未有的严谨和精确的计算方法来探索这些极其复杂的现象的非线性和动力学方面。最后，对凝固过程中的气泡和颗粒吞没现象的更深入了解将影响其他领域，如地质材料、增强金属陶瓷复合材料、多晶硅和生物冷冻保存过程。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。