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[IEEE 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS) - Kielce, Poland (2018.11.12-2018.11.14)] 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS) - Investigation and Determination of Efficiency of the Waste Heat Recovery System Using Peltier Modules
摘要： High efficiency technology of waste heat energy utilization would change the face of the energy market. Due to the fact that the energy system and transport are based on fossil fuels, there is a huge potential for its efficient use. Despite the fact that the technology of Peltier semiconductor modules has been known for many years, there are no solutions that might be commonly disseminated. There is also a deficit of available sources that in a transparent, coherent and synthetic way could provide guidelines for the constructors of such devices, and show how much energy they can generate and what efficiency they have. Moreover, the Peltier modules available on the market are burdened with many stereotypes. When trying to use this technology, it should be remembered that in addition to the Peltier phenomenon, the module's operation is based on four other physical phenomena: two of them have a negative impact and they determine the practically obtained parameters of the Peltier module. These are: Joule effect and heat conduction phenomenon. The other two phenomena: Seebeck and Thomson ones, play slightly smaller roles. The aim of the authors was to investigate the self-made model of a thermoelectric generator TEG, constructed using Peltier modules. The paper presents the results of measurements and the method of determining the electrical efficiency of this model. Additionally, a temperature range was determined at that such recovery has a measurable utilitarian aspect and economic sense. The limitations of semiconductor technology of Peltier cells have been given, and design guidelines at construction process of such systems to optimize their efficiency are presented.
关键词： Seebeck effect,thermoelectric generator TEG,determination of efficiency,Peltier module
更新于2025-09-23 15:23:52
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The Investigation of the Seebeck Effect of the Poly(3,4-Ethylenedioxythiophene)-Tosylate with the Various Concentrations of an Oxidant
摘要： Poly(3,4-ethylenedioxythiophene)-tosylate (PEDOT-Tos) can be synthesized through an in situ polymerization and doping process with iron(III) p-toluenesulfonate hexahydrate as an oxidant. Both the Seebeck coefficient and the electrical conductivity were modified by varying the concentration of the oxidant. We investigated the effects of varying the concentration of the oxidant on the particle sizes and doping (oxidation) levels of PEDOT-Tos for thermoelectric applications. We demonstrated that an increase in the oxidant enabled an expansion of the particle sizes and the doping levels of the PEDOT-Tos. The modification of the doping levels by the concentration of the oxidant can provide another approach for having an optimal power factor for thermoelectric applications. De-doping of PEDOTs by reduction agents has been generally investigated for changing its oxidation levels. In this study, we investigated the effect of the concentration of the oxidant of PEDOT-Tos on the oxidation levels, the electrical conductivities and the Seebeck coefficients. As loading the oxidant of PEDOT-Tos, the Seebeck coefficient was compromised, while the electrical conductivity increased.
关键词： conjugated polymer,doping concentration,seebeck effect
更新于2025-09-23 15:22:29
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Tunable Spin Seebeck Diode with Magnonic Spin Tunneling Junction
摘要： We theoretically investigate the spin–wave spin current induced by the spin Seebeck effect in magnonic spin tunneling junctions (MSTJs) for arbitrary magnetization directions. We show that the MSTJ functions as a tunable spin Seebeck diode in which the tunneling spin current can be turned on and off with high efficiency by controlling the magnetization direction.
关键词： spin current,spin Seebeck effect,diode,magnetization direction,magnonic spin tunneling junction
更新于2025-09-23 15:22:29
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Pyrite thin films on amorphous substrates: Interaction with the substrate and doping effects
摘要： Recent published literature dealing with FeS2 pyrite (thin films and single crystals) faces a few and relevant issues: the low photovoltage presented by pyrite (mainly related to the singular nature of its surface), the not yet clearly defined way of making available n and p type reliable samples and the relevance of their stoichiometry. To address the second and third issues, Fe thin films, Ti/Fe and Co/Fe bilayers deposited on sodalime glass and amorphous quartz substrates have been sulfurated at different temperatures (Ts) (Ts ? 600°C) during 20 h to obtain pyrite thin films. Seebeck coefficient and Hall Effect measurements have been carried out at room temperature with the sulfurated samples. It has been found that sulfurated Ti/Fe on sodalime glass presents a change of the Seebeck coefficient sign (from negative to positive) due to a strong interaction of the Ti layer with the substrate, which is not present in the Ti/Fe samples deposited on amorphous quartz. As a consequence of the interaction, a new TiO2 layer is formed between the sodalime glass substrate and the pyrite layer. Sulfurated Co/Fe bilayers on sodalime glass show a coherent behavior according to the obtained results and previously published works. They all appear to be n-type semiconductors when Ts ? 175°C. Non-intentionally doped Fe thin films on sodalime glass behave in a non-conclusive fashion from the point of view of their electrical transport characterization. The Seebeck coefficient (S) of the sulfurated films appear to be S > 0 for all values of Ts. However, the value and sign of the Hall constant behave in a non-reproducible way. Results are discussed on the light of present knowledge of synthetic pyrite thin films growth and doping.
关键词： Thin films,Hall effect,Seebeck effect,Doping effects,Sodalime glass,Pyrite
更新于2025-09-19 17:15:36
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Parametric analysis of solar energy conversion system using parabolic concentrator and thermopile
摘要： The present work aims at improving the design of an energy conversion system operating on solar radiation harvesting and converting it into electricity with the help of thermopiles. Here, the major focus is upon the design parameters and overall performance enhancement of the proposed energy conversion systems. The system consists of a parabolic concentrator to focus all the incident radiations available on the aluminium box containing thermopiles. A mathematical model is proposed for this system and different ways of minimising various possible heat losses are discussed. Furthermore, by maximising the heat flux in a thermoelectric generator, arrangement of the integrated system is analysed. The results obtained for the concentrator, thermoelectric generator and overall system efficiencies at varying energy losses and found that as the losses are decreased, efficiencies increased. At the losses around 40% of the total energy received, an overall efficiency as high as 12% with a considerably less bulky system.
关键词： solar constant,Parabolic concentrator,thermopiles,Seebeck effect
更新于2025-09-19 17:15:36
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[IEEE 2018 IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA) - Singapore (2018.7.16-2018.7.19)] 2018 IEEE International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA) - Seebeck Effect Imaging to Improve Short Defect Localization
摘要： Seebeck effect usually comes with OBIRCH analysis. Thermal variation will be generated when the IR laser irradiates on IC. The thermal gradient will induce small electrical potential gradient on different metals, like metal bridge defect. So Seebeck Effect Imaging is an important supplymentary method when doing OBIRCH analysis. Here we used Seebeck Effect Imaging to improve short defect localization on 45nm Cu metal AUTO products.
关键词： Seebeck effect,OBIRCH,metal bridge
更新于2025-09-19 17:15:36
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Observation of Longitudinal Spin Seebeck Voltage in YIG Films Chemically Prepared by Co-Precipitation and Spin Coating
摘要： Longitudinal spin Seebeck effect (LSSE) of Y3Fe5O12 (YIG) thin films chemically prepared on a Si substrate with a SiO2 surface layer has been investigated with a particular focus on its dependence on the metal (Pt or W) for the capping layer used to carry out the measurements. The YIG films are prepared by a combination of co-precipitation, spin coating, and annealing processes. The structural characterization by X-ray diffraction proves that the films are polycrystalline in a garnet phase with an average crystallite size of ～34 nm. The microstructural analyses of the film surface by scanning electron microscopy and scanning probe microscopy show that the roughness Ra of the film is ～31 nm. The magnetic easy axis of the YIG films is in the direction parallel to the films. We have found that the polarity of the LSSE voltage VLSSE measured with a Pt capping layer apparently differs from that observed when a W capping layer is used. The value of VLSSE increases almost linearly with increasing temperature difference (cid:2)T independent of the choice of metal for the capping layer. The observed LSSE for the polycrystalline YIG films is one order of magnitude smaller than that reported for YIG and Bi:YIG single-crystal samples grown by metal–organic decomposition.
关键词： Co-precipitation,spin coating,garnet ferrite,spin Seebeck effect (SSE)
更新于2025-09-11 14:15:04
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[IEEE 2018 Second International Conference on Electronics, Communication and Aerospace Technology (ICECA) - Coimbatore (2018.3.29-2018.3.31)] 2018 Second International Conference on Electronics, Communication and Aerospace Technology (ICECA) - Optimum Design of PolyMUMPs Based Thermoelectric Generator Chip
摘要： In this work, a design of poly Multi-User MEMS Processes, or PolyMUMPs based micro-thermoelectric generator (μTEG) with cost effective is presented. The presented 3-D numerical simulation model is verified with published experiment in previous work results by another author. The simulation results show that the output power at 1.3 K of temperature difference between the hot and cold sides of PolyMUMPs-μTEG device with the heat sink effect at optimal dimension is 16.56 μW.
关键词： PolyMUMPs,Multiphysics modeling,TEG,Seebeck effect
更新于2025-09-10 09:29:36
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Performance enhance of CMOS-MEMS thermoelectric infrared sensor by using sensing material and structure design
摘要： This study presents the micro thermoelectric infrared sensor consisted of the heat material. Experiment results indicate the Detectivity of proposed design is 2-2.6 fold higher The proposed infrared absorber design has an umbrella-like structure with a post anchor to the TSMC 0.18μm 1P6M standard CMOS process and the in-house post-CMOS MEMS process. (infrared sensor consisted of only the serpentine structure with embedded thermocouple), a transduction absorber and the serpentine structure with embedded thermocouple using the serpentine suspension with embedded thermocouple. As compare with the reference design much higher Seebeck coefficient (56-fold), and is employed in this study as the thermocouple junctions is increased. Moreover, the umbrella-like structure has higher infrared absorption area with and without Silicide are respectively characterized. The poly-Si with no Silicide has a as compare with the serpentine structure. In addition, the Seebeck coefficients of poly-Si films better heat-flow path is achieved and the temperature difference between the hot and cold than that of the reference one at 200mtorr. Experiment also show that the responsivity enhancement of proposed design is further increased as the sensor size is reduced in area.
关键词： thermoelectric,Seebeck effect,thermopile,CMOS-MEMS,infrared sensor
更新于2025-09-09 09:28:46