GOALI Collaborative Research: Intrinsically Minimal Thermal Conductivity in I-V-VI2 Thermoelectric Semiconductors

GOALI 合作研究：I-V-VI2 热电半导体本质上最小的导热率

• 批准号: 0754023
• 负责人: Joseph Heremans
• 金额: $ 19.62万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0754023&HistoricalAwards=false
• 关键词: GOALI; Collaborative; Research; Intrinsically; Minimal

CBET-0754023HeremansThe goal of this work is to lay the scientific groundwork to develop a new class of thermoelectric semiconductors based on I-V-VI2 compounds. This class of compounds possesses intrinsically the lowest lattice thermal conductivity possible in a crystalline material. Low lattice thermal conductivity is one of the prime factors in producing a high thermoelectric figure of merit; and ii) the PIs of this proposal have devised a method for preparing AgSbTe2 with very low carrier concentrations and high mobilities. The program is a GOALI with BSST as an industrial partner. Partnership with BSST, the world's largest user of thermoelectric materials, will ensure a rapid evaluation of the commercial potential of any new material produced. Intellectual MeritThis research will focus on rigorous experimental studies of the lattice and electronic properties of this class of semiconductors. The lattice thermal conductivity will be measured from 4 K to the melting point, with the Ag/Sb ordering as independent parameter. The data will be interpreted in terms of Umklapp and Normal phonon scattering processes, which will be derived without using adjustable relaxation times, and of the bond anharmonicity. Detailed band structure and Fermi surface information will be gleaned from Shubnikov-deHaas measurements. Preliminary first principle calculations show that AgSbTe2 may actually be a semimetal, and that its exact band structure is a function again of the amount of Ag/Sb ordering. The full galvanomagnetic, thermoelectric and thermomagnetic properties will be measured up to the melting point, and used to determine mobilities and electron scattering mechanisms. Broad ImpactEnhanced thermoelectric materials will enable an inexpensive method for converting solar thermal energy into electricity, and also will make possible the conversion of a fraction of the heat wasted by conventional heat engines, such as automotive power plants, into usable power. This is thus potentially transformative research that promises to reduce our reliance on fossil fuels, and to have a significant positive impact not only on the science and technology community, but on society in general. The partnership with BSST will ensure that the new thermoelectric materials are rapidly available for evaluation of their commercial potential. BSST will feed important information back to the research team about engineering criteria and the actual performance of the new materials in real electrical power generators. In the realm of education, this project will provide training for graduate students in a broad array of materials synthesis and characterization techniques. Additionally, results of the research will be incorporated into classes being developed by the PI?s in the areas of thermal transport and thermoelectricity. The significance of the broader issue of energy efficiency and usage that this research addresses will be integrated into the well established outreach programs at both institutions. Finally, the involvement of an industrial partner will give the students real-world experience into the engineering of transformative technological products and insight into the world of the energy industry.This project is jointly funded by the Thermal Transport Processes (TTP) Program, of the Chemical, Bioengineering, Environmental, and Transport Systems (CBET) Division, and by the Grant Opportunities for Academic Liaison with Industry (GOALI) Program, of the Industrial Innovation & Partnerships (IIP) Division, all within the Directorate for Engineering (ENG).

CBET-0754023HEREMANS这项工作的目标是为基于I-V-VI2化合物的基于I-V-VI2化合物开发一类新的热电半导体。 这类化合物本质上具有晶体材料中最低的晶格导热率。低晶格导热率是产生高热电图的主要因素之一。 ii）该提案的PI设计了一种制备具有非常低载体浓度和高迁移率的AGSBTE2的方法。 该计划是BSST作为工业合作伙伴的目标。 与全球最大的热电材料使用者BSST的合作关系将确保对生产的任何新材料的商业潜力进行快速评估。 知识分子的研究将重点介绍该类别半导体的晶格和电子特性的严格实验研究。 晶格导热率将从4 K到熔点测量，而Ag/SB排序作为独立参数。数据将以UMKLAPP和正常的声子散射过程来解释，这些过程将在不使用可调节的放松时间和键非harm谐性的情况下得出。 详细的带结构和费米表面信息将从Shubnikov-Dehaas的测量中收集。 初步的第一个原理计算表明，AGSBTE2实际上可能是半学，其确切的频带结构再次是AG/SB排序量的函数。将测量到熔点的完整电磁，热电和热磁特性，并用于确定迁移率和电子散射机制。 广泛的影响力热电材料将使一种廉价的方法将太阳能热能转换为电力，并且还可以使传统的热发动机（例如汽车动力厂）浪费的热量浪费的一小部分热量转换为可用的电源。 因此，这是潜在的变革性研究，有望减少我们对化石燃料的依赖，并且不仅对科学技术界，而且对整个社会产生重大积极影响。与BSST的合作伙伴关系将确保新的热电材料迅速可用于评估其商业潜力。 BSST将向研究团队提供有关工程标准和新材料在实际电气发电机中的实际性能的信息。在教育领域，该项目将通过各种材料综合和特征技术为研究生提供培训。 此外，该研究的结果将纳入由PI在热运输和热电学领域开发的类中。该研究所解决的更广泛的能源效率和用法问题的重要性将纳入两个机构的良好的外展计划。 最后，工业合作伙伴的参与将使学生的真实经验参与能源行业世界的工程以及对能源行业世界的洞察力。该项目由热运输过程（TTP）计划（TTP）计划，化学，生物工程，环境和运输系统（CBET）和Inter Intraperiation和Intartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial Indartial（目标）（目标）（TTP）计划（TTP）计划，该项目的目标及其目标（目标）（目标）（目标） （IIP）部门，全部在工程局（ENG）范围内。