制备工艺对新型热电材料制冷性能的影响

通过取点法得到了由Ingot法、BM法、S-MS法和Te-MS法制备的四种新型p型热电材料(Bi0.5Sb1.5)Te3的变物性参数拟合公式,分析了温度对不同方法制备的热电材料的影响,得到了热电材料无量纲优值与绝对温度的关系曲线.从热力学方面研究了制备工艺对基于新型热电材料的热电制冷器最大制冷系数的影响.结果表明:由Te-MS法制备的新型p型热电材料(Bi0.5Sb1.5)Te3具有最大的优值系数,基于该材料的热电制冷器最大制冷系数可达2.49,较其他三种方法制备的热电材料分别提升了 34.59％,37.57％和25.76％.     

碲化铋热电材料掺杂研究进展

碲化铋(Bi₂Te₃)作为近室温区热电性能最好的材料之一,在电子器件、航空航天等领域具有广阔的应用前景。但该材料热电转换效率较低,制约了其规模化工业应用。因此,如何提高Bi₂Te₃材料的热电转换效率成为重点关注的问题。在Bi₂Te₃材料中掺杂不同的元素或第二相,通过调整材料的晶体结构、化学组分及能带结构,调控载流子浓度和迁移率,降低热导率,可提高材料的热电性能。依据Bi₂Te₃热电材料的结构、性质及掺杂改性原理,以掺杂元素或第二相种类和数量作为切入点,总结了目前的部分研究成果,探讨掺杂对Bi₂Te₃材料热电性能的影响,并指出了今后的研究重点及方向。     

三类金属氧化物热电材料的研究进展

综述了NaxCo2O4系、ZnO系和CuAlO2系氧化物热电材料的晶体结构、制备方法和研究现状,发现这三类热电材料均具有较好的热电性能,具有进一步研究的价值。阐述了金属氧化物热电材料未来的研究方向。     

Bi2Te3热电材料研究现状

Bi2Te3热电材料是半导体材料,室温下具有良好的热电特性,能够实现热能和电能的相互转化,应用前景十分广阔。Bi2Te3热电材料的转换效率低是影响其应用的瓶颈之一,目前世界范围内的研究热点主要集中在如何提高热电材料的能量转换效率上。综述了热电材料的种类、国内外关于Bi2Te3热电薄膜的制备方法和性能研究,对多种典型制备方法进行分析对比,探讨了影响Bi2Te3热电薄膜质量的因素及机制。结合Bi2Te3热电薄膜在温差发电和热电制冷方面的应用,如果微型热电制冷器实现与大功率LED芯片集成封装,那么芯片级低温散热问题有望解决。     

日开发出高效热电转换材料

日本《读卖新闻》报道说,日本和美国科研人员合作开发出一种新型热电转换材料,其效率达到常规热电转换材料的约2倍。     

微型热电能量采集器的研究进展

热电能量采集器是一种基于塞贝克效应,利用温差将热能直接转化成电能的温差发电装置.由于其体积小、重量轻、寿命长、无机械运动部件、绿色环保等优点,微型热电能量采集器(MTEG)已经引起了国内外的广泛关注.综述了微型热电能量采集器在国内外的研究进展,介绍了温差发电的工作原理,从热电材料和器件结构两方面重点探讨了微型热电能量采集器的研究现状.对微型热电能量采集器未来的发展方向进行了分析和预测,认为积极寻找具有高优值系数的热电材料制备易于加工和集成的高性能的微型热电能量采集器是未来研究工作的目标.微型热电能量采集器有广阔的应用前景.     

长余辉材料的研究进展

系统地介绍了长余辉材料的发展历史、发光机理及常规制备方法.结合作者所做的工作及对近几年研究状况的对比分析,展望了长余辉材料的研究趋势和可能的应用前景.     

Ca_3Co_4O_9热电材料的研究进展

由于Ca_3Co_4O_9具有良好的化学稳定性及廉价、无毒等优点,已成为氧化物热电材料研究的热点。但其合成难,致密度低,转换效率低等严重阻碍了Ca_3Co_4O_9的实际应用。该文从合成方法、改性手段及烧结工艺等3方面,归纳和分析了层状结构Ca_3Co_4O_9的研究进展,并对Ca_3Co_4O_9今后的研究发展提出一些建议。     

热电材料最新论文摘录

☆热电材料的研究现状及展望【作者】刘杨【机构】哈尔滨师范大学物理与电子工程学院【摘要】本文综述了不同种类热电材料的结构特征和热电性能。归纳了提高热电材料的热电性能的方法、途径以及热电材料     

Zintl结构化学在热电材料研究中的应用

Zintl相化合物满足“电子晶体-声子玻璃”特征,能够通过化学掺杂和结构修饰来提高其热电性能,是理想的热电材料研究对象。阐明了热电材料性能优化的Zintl结构化学原理,介绍了Zintl结构化学在高性能热电材料研究中的应用,指出利用Zintl结构化学原理寻找高性能热电材料是今后热电材料研究的重要方向。     

Machine Learning Approaches for Thermoelectric Materials Research

Thermoelectric (TE) materials provide a solid‐state solution in waste heat recovery and refrigeration. During the past few decades, considerable effort has been devoted towards improving the performance of TE materials, which requires the optimization of multiple interrelated properties. A fundamental understanding of the interaction processes between the various energy carriers, such as electrons and phonons, is critical for advances in the development of TE materials. However, this understanding remains challenging primarily due to the inaccessibility of time scales using standard atomistic simulations. Machine learning methods, well known for their data‐analysis capability, have been successfully applied in research on TE materials in recent years. Here, an overview of the machine learning methods used in thermoelectric studies is provided, with the role that each machine learning method plays being systematically discussed. Furthermore, to date, the scale of thermoelectric‐related databases is much smaller than those in other fields, such as e‐commerce, image identification, and speech recognition. To overcome this limitation, possible strategies to utilize small databases in promoting materials science are also discussed. Finally, a brief conclusion and outlook are presented.     

Addressing the Challenges of Commercializing New Thermoelectric Materials

The time it takes for new thermoelectric materials to make the transition from first announcement in peer-reviewed publications to commercialization is undesirably long. As a result, universities, laboratories, government agencies, commercial users, and venture funding providers throughout the world have not supported research in the field to the level that would be expected for such an otherwise promising technology. This delay also has led to some misdirection of research efforts and a lack of availability of dependable long-term sponsorship commitments to research in the field. From the perspective of commercial users, this presentation discusses the challenges that the thermoelectric material research community faces in creating materials of commercial value. These challenges are broken down into objectives for both the traditional research activities related to improving ZT and those efforts needed to satisfy other, less recognized requirements which, if unaddressed, can significantly impede or even prevent commercialization. The ZT thresholds that enable much larger markets are presented for power generation, cooling, heating, and temperature control materials. Other important considerations, including semiconductor to metal interface (metallization) properties, material stability and constituent requirements, and costs and environmental-impact-related requirements are discussed. At the system level, factors that impede material development are identified, including challenges arising from a lack of property measurement repeatability among different organizations. Approaches and results are compared with that of the more heavily funded and rapidly developing photovoltaic field. The presentation concludes with recommendations for measures to accelerate thermoelectric material commercialization. International Conference on Thermoelectrics (August 3–7, 2008, Corvallis, Oregon, USA).     

Automotive Applications of Thermoelectric Materials

This report reviews several existing and potential automotive applications of thermoelectric technology. Material and device issues related to automotive applications are discussed. Challenges for automotive thermoelectric applications are highlighted.     

Advanced Thermoelectric Materials for Flexible Cooling Application

Flexible cooling devices, which aim to fulfill the essential requirement of complex working environments and enable local heat dissipation, have become the cutting-edge area of refrigeration technology. Thermoelectric (TE) material represents a promising candidate for various flexible cooling applications, including wearable personal thermoregulation devices. With the increasing interest in the Peltier effect of conductive polymers and inorganic films on flexible substrates, flexible cooling devices have undergone rapid development. Herein, the fundamental mechanisms, basic parameters, and temperature measurement techniques for evaluating the cooling performance are summarized. Moreover, recent progress on TE materials, such as flexible inorganic and organic materials for Peltier cooling studies, is reviewed. More importantly, insights are provided into the key strategies for high-performance Peltier devices. The final part details the existing challenges and perspectives on flexible TE cooling to inspire additional research interests toward the advancement of refrigeration technology.     

Reversible Room Temperature Brittle-Plastic Transition in Ag2Te0.6S0.4 Inorganic Thermoelectric Semiconductor

Inorganic semiconductors with superior plasticity are highly desired in current flexible electronics, which however are rarely discovered owing to their intrinsic covalent and ionic bonds. The Ag₂Te_0.6S_0.4 semiconductor with an amorphous phase has recently been reported to exhibit plastic deformability. In this study, the reversible brittle-plastic transition is found in this inorganic semiconductor, and the plasticity of the Ag₂Te_0.6S_0.4 sample is highly related to the phase structures. The Ag₂Te_0.6S_0.4 with a monoclinic phase exhibits a brittle behavior, while the one with cubic-crystalline/amorphous structure shows exceptional plasticity with a compressive strain of over 80%. Significantly, the reversible plastic-brittle transition in Ag₂Te_0.6S_0.4 inorganic semiconductor can be achieved by simple heat treatment. Besides the plasticity, the cubic-crystalline/amorphous Ag₂Te_0.6S_0.4 composites also possess good thermoelectric performance. This study uncovers the influence of phase structure on the mechanical properties of Ag₂Te_0.6S_0.4 and realizes the reversible brittle-plastic transition, facilitating its prospective application in flexible/wearable electronics.     

Organic Thermoelectric Materials: Niche Harvester of Thermal Energy

Organic thermoelectric (OTE) materials promise convenient energy conversion between heat gradients and voltage with flexible and wearable power-supplying devices at a low price. Although a variety of OTE materials are investigated, the TE performance is still far from practical application. To achieve high TE performance, a thorough understanding of the structure–property relationship in OTE materials is necessary. In this comprehensive review, the fundamentals of OTEs are summarized, the recent achievements of OTE materials are reviewed, and the relationship between structure and properties in high-performance OTE materials is discussed. Furthermore, how the molecular backbones, side chains, energy levels, molecular packing, and heteroatom effect all play vital roles in thermoelectric properties is addressed. Finally, the future direction of research on OTE materials is envisaged.     

Nanoscale Organic Thermoelectric Materials: Measurement,Theoretical Models,and Optimization Strategies

The demands for waste heat energy recovery from industrial production, solar energy, and electronic devices have resulted in increasing attention being focused on thermoelectric materials. Over the past two decades, significant progress is achieved in inorganic thermoelectric materials. In addition, with the proliferation of wireless mobile devices, economical, efficient, lightweight, and bio‐friendly organic thermoelectric (OTE) materials have gradually become promising candidates for thermoelectric devices used in room‐temperature environments. With the development of experimental measurement techniques, the manufacturing for nanoscale thermoelectric devices has become possible. A large number of studies have demonstrated the excellent performance of nanoscale thermoelectric devices, and further improvement of their thermoelectric conversion efficiency is expected to have a significant impact on global energy consumption. Here, the development of experimental measurement methods, theoretical models, and performance modulation for nanoscale OTE materials are summarized. Suggestions and prospects for the future development of these devices are also provided.