In bulk pbte small compositional variations create coherent and semicoherent nanometer sized precipitates embedded in a pbte matrix, where they can impede phonon propagation at little or no. Recent advances in thermoelectric materials matthew thorum literature seminar november 16, 2006 the ability of thermoelectric materials to accomplish direct conversion between thermal and electrical energy in compact, durable, solidstate devices without moving parts makes them an attractive technology for refrigeration and waste heat recovery. The averaged sound velocity is about 2,080 ms, which is much lower than typical solidstate materials. The main issue with oxides is the high thermal conductivity. Recent progress of twodimensional thermoelectric materials. This paper presents experiments on the power and efficiency characteristics of lowand midtemperature thermoelectric materials. An electron microscopy study of agpb18sbse20 crystals. Ace082 this presentation does not contain any proprietary, confidential, or otherwise restricted information. The objective of the phase 1 proposal was to demonstrate a new route to the realization of highly efficient bulk thermoelectric materials through engineering material structures at the nanoscale. In situ nanostructuring in bulk thermoelectric materials through thermodynamic phase segregation has established itself as an effective paradigm for optimizing the performance of thermoelectric materials. To achieve this, i have developed different approaches with the purpose to enhance the transport properties of the materials and to overcome the.
In operando study of highperformance thermoelectric. The production of suitable thermoelectric te materials require high seebeck coefficient s and. The widespread use of thermoelectric components is presently limited by the low figureofmerit of presently known materials. Performance thermoelectricity in nanostructured earth. Shenzhen key laboratory of thermoelectric materials, department of physics, south university of science and technology of china, shenzhen, 518055 china. Understanding nanostructures in thermoelectric materials. This discovery sets the stage for use of a new nanocomposite approach in developing highperformance lowcost bulk thermoelectric materials. Request pdf on jul 1, 2012, jian he and others published nanostructured thermoelectric materials find, read and cite all the research you need on researchgate. High performance bulk nanostructured thermoelectric materials superlattice and nanostructured materials theoretical studies of transport properties. In this work, we demonstrate the use of high performance nanostructured pbtebased materials in high conversion efficiency thermoelectric modules. Although graphene exhibits advantage as a highperformance thermoelectric material, more efforts in simulations and experiments need to be. Nanostructured thermoelectric materials request pdf. Submit your cover letter and manuscript in ms word or pdf format directly.
This discovery sets the stage for use of a new nanocomposite approach in developing high performance lowcost bulk thermoelectric materials. Sige has been used as the hightemperature thermoelectric material in radioisotope thermoelectric generators rtgs by nasa in deep space missions and moon landings. By employing mssps technique, his research group obtained high performance bi. Nanostructured hh and bt materials offer a lowcost, highperformance, reliable and durable option for te power generation and offers the promise of affordable scaleup and system packaging project approach. Surface chemical tuning of phonon and electron transport. Semiconductor optoelectronic devices introduction to physics and simulation semiconductor optoelectronic devices. Recent developments in nanostructured materials for high. In operando study of highperformance thermoelectric materials for power generation. Nanostructured hightemperature bulk thermoelectric. Nanostructured materials and thermoelectrics have been the subject of signi cant research in recent years 5, and it is a challenging topic combining materials science, nanoscience and physics.
Wearable thermoelectric coolers tecs, whose performance depends on optimal module design and environmental thermal resistance, are an attractive nextgeneration technology for onbody. Highthermoelectric performance of nanostructured bismuth. High performance thermoelectric materials in a wide range of temperatures are essential to broaden the application spectrum of thermoelectric devices. Highperformance nanostructured thermoelectric materials. Phillpot,11 eric pop,12 and li shi 1department of materials science and engineering and the frederick seitz materials. This increase in zt shows the possibility of the preparation of highly efficient thermoelectric materials by chemical synthesis. On the effective thermoelectric properties of layered heterogeneous medium y. Thermoelectric materials promise to create additional efficiencies in energy management by harvesting the energy of waste heat and converting it to electricity. A traditional limitation of thermoelectric performance in bulk materials is the. Margaret antonik performance and design comparison of a. In this study, we achieved an even higher module efficiency with newly developed nanostructured thermoelectric materials. High electrical conductivity corresponding to low joule heating, a large seebeck coefficient corresponding to large potential difference and low thermal.
Introduction thermoelectric power generators tegs can recuperate waste heat by directly converting it. Here, a scalable screenprinting method to fabricate highperformance and flexible thermoelectric devices is reported. An overview of advanced chalcogenide thermoelectric materials and their applications article pdf available april 2018 with 644 reads how we measure reads. Optoelectronics an introduction to materials and devices pdf. There have been remarkable developments in recent years to develop high performance bulk thermo. Due to the small size of the nanopowders, the bulk materials possess very fine grains after sintering. Advanced energy materials condensed matter physics and materials science department, brookhaven national laboratory a birds eye view is provided of superconducting and thermoelectric materials research at the advanced energy materials group. Nonequilibrium synthesis of high performance nanostructured thermoelectric. The use of mps sams creates a strong covalent binding and more nucleation sites with even distribution for electroplating contact electrodes on nanostructured thermoelectric materials. The high performance of most of these materials is related to nanostructure engineering. In most nanostructured te materials, understanding the interplay between nanostructures and te properties under dynamic conditions plays an important role to develop high performance and stable te materials and devices. The developed solar thermoelectric generators stegs achieved a peak ef.
Cooling devices that use these materials have produced hightemperature differences of 86, 106, and 119c with hotside temperatures set at 50, 100, and 150c, respectively. As a result, nanostructured materials have achieved both higher power factors and. University of groningen design of advanced thermoelectric. High values of thermoelectric figures of merit zt, ranging from zt1. Our recent discovery of phonon glass behaviour in asite deficient perovskite oxides and silicon nano films demonstrates that high performance thermoelectric materials can be designed using a cation vacancy engineering. Pair distribution function pdf analysis44 of x ray. Bulk structures embedded with nanomaterials are usually called bulk nanostructured thermoelectric materials 4,5,6.
Optical properties of in2xga22xo3 nanowires revealed by. Cooling devices that use these materials have produced high temperature differences of 86, 106, and 119c with hotside temperatures set at 50, 100, and 150c, respectively. Computational strategies for design and discovery of nanostructured. The maximum thermoelectric figureofmerit, zt, is 0. High efficiency conversion of waste heat into electricity. Ultrahigh performance wearable thermoelectric coolers. Thermoelectric power generation can play a key role in a sustainable energy future by converting waste heat from power plants and other industrial processes into. Resume of xinfeng tang international thermoelectric society. A reliable highperformance flatpanel steg can be obtained by using. The performances of these recently developed nanostructured te materials can depend heavily on the material synthesis.
Thermoelectric energy conversion using nanostructured. While many rigid bulk materials have shown a thermoelectric figure of merit zt greater than unity, it is an exacting challenge to develop flexible materials with zt near unity. The fundamental problem in designing new materials for thermoelectric applications lies in the interdependence of the three key properties figure 3 that determine the figureofmerit and hence performance. Recent progress in nanostructured thermoelectric materials. The core intellectual challenges in emerging thermoelectric. Highthermoelectric performance of nanostructured bismuth antimony telluride bulk alloys. Figure of merit zt of recent highperformance bulk thermoelectric materials as a function of applied temperature. Nanostructured pbtebased module and segmentedleg module using bi 2 te 3 and nanostructured pbte were fabricated and tested with hotside temperatures up to 873 k in a vacuum. On the effective thermoelectric properties of layered. Nanostructured thermoelectric materials springerlink.
Nanostructured high temperature bulk thermoelectric energy conversion for efficient waste heat recovery dr. We fabricated the samples of pbte2% mgte doped with 4% na and pbte doped with 0. T of 590 k have been demonstrated in the nanostructured pbtebased module and segmented bi 2 te 3 nanostructured pbte module, respectively. He also pinpoints the formation mechanism of microstructure in ms and sps processes, and the relation between microstructure and thermoelectric properties. High temperature thermoelectric properties measurement. Excessively doped pbte with geinduced nanostructures. Mqmssps techniques for preparing high performance nanostructured thermoelectric materials. Thermoelectric power factor in nano to microscale porous composites.
Copy and paste a formatted citation or use one of the options to export in your chosen format. Laser sintered nanograin sige thermoelectric thin film devices. Of various types of thermoelectric materials, nanostructured materials have shown the most. One of the recently emerged applications of hollow inorganic nanonetworks is nanostructured thermoelectric materials 93 94 95. Reliable contact fabrication on nanostructured bi2te3.
Thermoelectric materials can convert heat directly into electricity with the advantages of long lifespan, maintenancefree operation, and excellent reliability. The devices were fabricated from soi wafers and consist of a. Conversion efficiency and effective properties of particulatereinforced thermoelectric composites. These monolithic films can be reused at least five times while maintaining good photocatalytic performance comparable to commercial tio 2 nanoparticles p25. Flexible thermoelectric devices of ultrahigh power factor. Pdf an overview of advanced chalcogenide thermoelectric. Schematics and scanning electron microscopy sem images of the silicon nanowire sinw samples used for our experiments are shown in figure 1. In comparison, conventional bi2te3based materials have a peak zt of about 1 at room temperature and about 0. Nanostructures boost the thermoelectric performance of pbs. View the article pdf and any associated supplements and figures for a.
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