Nanostructured Thermoelectric Films
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Nanostructured Thermoelectric Films
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Author : Zhiyu Hu
language : en
Publisher: Springer Nature
Release Date : 2020-07-10
Nanostructured Thermoelectric Films written by Zhiyu Hu and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-07-10 with Technology & Engineering categories.
This book presents a range of low-dimensional superlattice thermoelectric materials based on physical vapor deposition (PVD) methods and explores various material types, thicknesses, and processing conditions. With the advances made in the performance of semiconductor thermoelectric materials and the efficiency of thermoelectric devices in recent years, thermoelectric power generation systems are likely to replace traditional mechanical heat engines, offering an environmentally friendlier alternative. The use of low-dimensional, nanostructured materials can significantly increase the density of states near the Fermi level and greatly improve the thermoelectric properties of materials. In addition, the book demonstrates that it is possible to influence thermoelectric performance, establish more accurate mathematical models through the regulation of relevant parameters, and ultimately improve the thermoelectric figure of merit (ZT).
Thin Film And Flexible Thermoelectric Generators Devices And Sensors
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Author : Sergey Skipidarov
language : en
Publisher: Springer Nature
Release Date : 2021-03-13
Thin Film And Flexible Thermoelectric Generators Devices And Sensors written by Sergey Skipidarov and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-03-13 with Technology & Engineering categories.
This book presents and facilitates new research and development results with hot topics in the thermoelectric generators (TEGs) field. Topics include: novel thin film; multilayer, composite and nanostructured thermoelectric materials; simulation of phenomena related to thermoelectricity; thermoelectric thin film and multilayer materials manufacturing technologies; measurement techniques for characterization; thermoelectric generators; and the simulation, modeling, design, thermal, and mechanical degradation problems. This book helps researchers tackle the challenges that still remain in creating cheap and effective TEGs and presents the latest trends and technologies in development and production of advanced thermoelectric generation devices.
Thermal Transport In Nanostructured Thin Films For Thermoelectric Applications
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Author : Suzanne Lee Singer
language : en
Publisher:
Release Date : 2009
Thermal Transport In Nanostructured Thin Films For Thermoelectric Applications written by Suzanne Lee Singer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Innovative Thermoelectric Materials
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Author : Howard E. Katz
language : en
Publisher: World Scientific
Release Date : 2016
Innovative Thermoelectric Materials written by Howard E. Katz and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Technology & Engineering categories.
"Power generation from environmentally friendly sources has led to surging interest in thermoelectrics. There has been a move toward alternative thermoelectric materials with enhanced performance through materials and structures that utilize common and safer elements and alternative mechanistic approaches while increasing processing latitude and decreasing cost. This wide-ranging volume examines this progress and future prospects with the new technologies, ease of processing and cost as major considerations, and will benefit active researchers, students and others interested in cutting-edge work in thermoelectric materials. Innovative Thermoelectric Materials incorporates the contributions of a group of recognized experts in thermoelectric materials, many of whom were the first to introduce various materials systems into thermoelectric systems. The perspectives brought to this evolving subject will provide important insights on which those developing the field can build, and will inspire new research directions for the future."--Provided by publisher.
Thermoelectric Thin Films
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Author : Paolo Mele
language : en
Publisher: Springer
Release Date : 2019-07-17
Thermoelectric Thin Films written by Paolo Mele and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-07-17 with Technology & Engineering categories.
This book will provide readers with deep insight into the intriguing science of thermoelectric thin films. It serves as a fundamental information source on the techniques and methodologies involved in thermoelectric thin film growth, characterization and device processing. This book involves widespread contributions on several categories of thermoelectric thin films: oxides, chalcogenides, iodates, nitrides and polymers. This will serve as an invaluable resource for experts to consolidate their knowledge and will provide insight and inspiration to beginners wishing to learn about thermoelectric thin films. Provides a single-source reference on a wide spectrum of topics related to thermoelectric thin films, from organic chemistry to devices, from physical chemistry to applied physics, from synthesis to device implementation; Covers several categories of thermoelectric thin films based on different material approaches such as oxides, chalcogenides, iodates, nitrides and polymers; Discusses synthesis, characterization, and device processing of thermoelectric thin films, as well as the nanoengineering approach to tailor the properties of the used materials at the nanoscale level.
Scanning Hot Probe Technique For Nanostructured Films Thermoelectric Properties Characterization
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Author : Claudiu L. Hapenciuc
language : en
Publisher: ProQuest
Release Date : 2007
Scanning Hot Probe Technique For Nanostructured Films Thermoelectric Properties Characterization written by Claudiu L. Hapenciuc and has been published by ProQuest this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Mechanical engineering categories.
Thermoelectric And Structural Characterization Of Individual Nanowires And Patterned Thin Films
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Author : Anastassios Andreas Mavrokefalos
language : en
Publisher:
Release Date : 2008
Thermoelectric And Structural Characterization Of Individual Nanowires And Patterned Thin Films written by Anastassios Andreas Mavrokefalos and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
This dissertation presents the development of methods based on microfabricated devices for combined structure and thermoelectric characterizations of individual nanowire and thin film materials. These nanostructured materials are being investigated for improving the thermoelectric figure of merit defined as ZT=S2[sigma]T/K, where S is the Seebeck coefficient, [sigma] is the electrical conductivity, K is the thermal conductivity, and T is the absolute temperature. The objective of the work presented in this dissertation is to address the challenges in the measurements of all the three intrinsic thermoelectric properties on the same individual nanowire sample or along the in plane direction of a thin film, and in correlating the measured properties with the crystal structure of the same nanowire or thin film sample. This objective is accomplished by the development of a four-probe thermoelectric measurement procedure based on a micro-device to measure the intrinsic K, [sigma], and S of the same nanowire or thin film and eliminate the contact thermal and electrical resistances from the measured properties. Additionally the device has an etched through hole that facilitates the structural characterization of the sample using transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). This measurement method is employed to characterize individual electrodeposited Bi[subscript 1-x]Te[subscript x] nanowires. A method based on annealing the nanowire sample in a forming gas is demonstrated for making electrical contact between the nanowire and the underlying electrodes. The measurement results show that the thermoelectric propertied of the nanowires are sensitive to the crystal quality and impurity doping concentration. The highest ZT found in three nanowires is about 0.3, which is still lower than that of bulk single crystals at the optimum carrier concentration. The lower ZT found in the nanowires is attributed to the high impurity or carrier concentration and defects in the nanowires. The micro-device is further modified to extend its use to characterization of the in-plane thermoelectric properties of thin films. Existing practice for thermoelectric characterization of thin films is obtaining K in the cross plane direction using techniques such as the 3[omega] method or time domain laser thermal reflectance technique whereas the [sigma] and S are usually obtained in the in-plane direction. However, transport properties of nanostructured thin films can be highly anisotropic, making this combination of measurements along different directions unsuitable for obtaining the actual ZT value. Here, the micro-device is used to measure all three thermoelectric properties in the in-plane direction, thus obtaining the in-plane ZT. A procedure based on a nano-manipulator is developed to assemble etched thin film segments on the micro-device. Measurement results of two different types of thin films are presented in this dissertation. The first type is mis-oriented, layered thin films grown by the Modulated Elemental Reactant Technique (MERT). Three different structures of such thin films are characterized, namely WSe2, W[subscript x](WSe2)[subscript y] and (PbSe0.99)[subscript x](WSe2)[subscript x] superlattice films. All three structures exhibit in-plane K values much higher than their cross-plane K values, with an increased anisotropy compared to bulk single crystals for the case of the WSe2 film. The increased anisotropy is attributed to the in-plane ordered, cross-plane disordered nature of the mis-oriented, layered structure. While the WSe2 film is semi-insulating and the W[subscript x](WSe2)[subscript y] films are metallic, the (PbSe0.99)[subscript x](WSe2)[subscript x] films are semiconducting with its power factor (S2[sigma]) greatly improved upon annealing in a Se vapor environment. The second type of thin films is semiconducting InGaAlAs films with and without embedded metallic ErAs nanoparticles. These nanoparticles are used to filter out low energy electrons with the introduction of Schottky barriers so as to increase the power factor and scatter long to mid range phonons and thus suppress K. The in-plane measurements show that both the S and [sigma] increase with increasing temperature because of the electron filtering effect. The films with the nanoparticles exhibited an increase in [sigma] by three orders of magnitude and a decrease in S by only fifty percent compared to the films without, suggesting that the nanoparticles act as dopants within the film. On the other hand, the measured in-plane K shows little difference between the films with and without nanoparticles. This finding is different from those based on published cross-plane thermal conductivity results.
Nanostructured Thin Film Thermoelectric Composite Materials Using Conductive Polymer Pedot Pss
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Author : Chris Adam Kuryak
language : en
Publisher:
Release Date : 2013
Nanostructured Thin Film Thermoelectric Composite Materials Using Conductive Polymer Pedot Pss written by Chris Adam Kuryak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Thermoelectric materials have the ability to convert heat directly into electricity. This clean energy technology has advantages over other renewable technologies in that it requires no sunlight, has no moving parts, and is easily scalable. With the majority of the unused energy in the United States being wasted in the form of heat and the recent mandates to reduce greenhouse gas emissions, thermoelectric devices could play an important role in our energy future by recovering this wasted heat and increasing the efficiency of energy production. However, low conversion efficiencies and the high cost of crystalline thermoelectric materials have restricted their implementation into modem society. To combat these issues, composite materials that use conductive polymers have been under investigation due to their low cost, manufacturability, and malleability. These new composite materials could lead to cheaper thermoelectric devices and even introduce the technology to new application areas. Unfortunately, polymer composites have been plagued by low operating efficiencies due to their low Seebeck coefficient. In this research, we show an enhanced Seebeck coefficient at the interface of poly(3,4- ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) spin coated onto silicon substrates. The maximum Seebeck coefficient achieved was 473 uV/K with a PEDOT:PSS thickness of 7.75 nm. Furthermore, the power factor of this interface was optimized with a 15.25 nm PEDOT:PSS thickness to a value of 1.24 uV/K2-cm, which is an order of magnitude larger than PEDOT:PSS itself. The effect of PEDOT:PSS thickness and silicon thickness on the thermoelectric properties is also discussed. Continuing research into this area will attempt to enhance the power factor even further by investigating better sample preparation techniques that avoid silicon surface oxidation, as well as creating a flexible composite material of PEDOT:PSS with silicon nanowires..
Nanostructures And Thin Films For Multifunctional Applications
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Author : Ion Tiginyanu
language : en
Publisher: Springer
Release Date : 2016-04-02
Nanostructures And Thin Films For Multifunctional Applications written by Ion Tiginyanu and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-02 with Technology & Engineering categories.
This book is focused on recent advances in the development of thin films for photovoltaic applications, TiO2/WO3 bi-layers for applications with enhanced photo-catalytic properties, nanometer oxide and hydroxide films for anticorrosive coatings, surface passivation in chemical industries, micro- and nanoelectronics, trilayers of metglas and lead free piezoelectrics for magnetic field sensors, current sensors, spintronics, microwave and read/write devices. Diluted ferromagnetic alloy films are also considered for superconducting spintronics based on superconducting spin-valves. Thermal properties of segmented nanowires are analyzed with respect to thermoelectric applications. Recent advances in template production of nanocomposites are also reviewed with particular focus on technologies for template assisted formation of metal nanotubes. Some elements related to abrasive flow machining (AFM), specifically state of the art elements of technological systems and construction of equipment are presented. The book is written for researchers in materials science, nanotechnologies, PhD students and graduate student.
Thermoelectric Bi2te3 Nanomaterials
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Author : Oliver Eibl
language : en
Publisher: John Wiley & Sons
Release Date : 2015-04-23
Thermoelectric Bi2te3 Nanomaterials written by Oliver Eibl and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-04-23 with Technology & Engineering categories.
Edited by the initiators of a priority research program funded by the German Science Foundation and written by an international team of key players, this is the first book to provide an overview of nanostructured thermoelectric materials -- putting the new developments into perspective alongside conventional thermoelectrics. As such, it reviews the current state of research on thermoelectric Bi2Te3 nanomaterials, covering advanced methods of materials synthesis, characterization of materials structures and thermoelectric properties, as well as advances in the theory and modeling of transport properties. Nanomaterials-based thermoelectric devices are also discussed with respect to their properties, their suitability for different energy generation applications, and in light of their commercialization potential. An outlook on the chances, challenges and future directions of research rounds off the book, giving a straightforward account of the fundamental and technical problems - plus ways to overcome them.