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In this work, some initial efforts to determine the physical properties of metallic films with thickness values below 200 nm are described. The proposed methodologies to measure the temperature coefficient of resistance, the specific heat, thermal diffusivity, thermal conductivity values of Au, Al, and Cu films as such as the elastic modulus of metallic nano-alloys are discussed. The thermal properties...
In this article, we present a finite-element method (FEM)-based thermo-electric model to accurately capture the characteristics of phase-change memory devices. The individual thermoelectric heating components are separated to obtain a detailed understanding of thermal transport in the device. This work is different from other exciting modeling work on thermoelectrics in that, for the first time, it...
This paper describes a system for the simultaneous dynamic control and thermal characterization of the heating and cooling phases of an ultralow-power (ULP) micromachined sensor, featuring thermal characteristics that are quite similar to those of innovative ULP semiconducting metal-oxide gas sensors. A pulsewidth-modulated (PWM) excitation system has been realized using a microcontroller featuring...
We have developed a novel, calibration free, micro electromechanical device and method for the measurement of linear flow rate in a micro-gas chromatography (GC) system This design enables the integration of a flow rate measurement with a high sensitivity thermal conductivity detector (TCD) reported at MEMS 2009. Accurate knowledge of the flow rate is of vital importance when quantifying the results...
Thermoelectric modules (TEMs) are solid-state devices used for cooling, heating and power generation. An experimental apparatus was developed to characterize the performance of a TEM and heat sink assembly, where the TEM is operated in refrigeration mode. A numerical model was developed to simulate the experiments. Bulk and interfacial Ohmic heating, along with Peltier and Thomson effects were modeled...
The present paper deals with the experimental validation of an electro-thermal simulator which is able to foresee the electrical and thermal parameters of any shaped metal interconnection driven by constant voltage or constant current in single-layer PCB. The algorithm inside the simulator has been improved to adapt to the actual experiment condition, especially adding in the thermal radiation contribution...
The poor thermal design of high brightness light-emitting diodes (HB-LEDs) package for the automotive exterior lighting system causes the degradation of the optical and reliability performance, also the deterioration of the cost-effectiveness. We design the flexible package substrate with the thick heat-spreading layer and thermal via-hole fully filled with the copper (FFC) for the conventional process...
A physical yet analytical phase change memory (PCM) model simultaneously accounting for thermal and electrical conductivities is presented. Due to the physics based nature of the model, the essential temperature from heating and cooling of PCM during operation is instantaneously updated. More importantly, the model can be applied to non-conventional circuit design technique. We show that for the first...
ldquoDevelopment for advanced thermoelectric conversion systemsrdquo supported by the new energy and industrial technology development organization (NEDO) has been successfully completed as one of the Japanese national energy conservation projects. Three types of the cascaded thermoelectric modules operating up to 850 K in high electrode temperature and two types of Bi-Te thermoelectric modules operating...
Thermoelectric properties of ternary silver thallium tellurides: Ag8T12Te5 and AgT13Te2 were studied above room temperature to slightly below the melting temperature. As for Ag8T12Te5, the effects of Te content on the thermoelectric properties were also studied by characterizing the samples of Ag8T12Tex (x = 5.0, 5.1, 5.2). Both compounds show positive Seebeck coefficient (S). Ag8T12Te5 indicates...
The polycrystalline samples of BaSi2, SrSi2, and LaSi were prepared by spark plasma sintering (SPS). The electrical resistivity (rho) and Seebeck coefficient (S) were measured above room temperature. The S of BaSi2 was negative and the absolute values were rather high (-669 muVK-1 at 337 K). The S of SrSi2 was positive and the absolute values were lower (118 muVK-1 at 332 K) than those of BaSi2. For...
Cooling is important to keep the temperatures of the highly integrated silicon electronic devices and power devices e.g. power MOSFET, IGBT. Yamaguchi et al. have proposed a new scheme to cool down the devices by its own current named ldquoself-cooling devicerdquo, in which the cooling process uses Peltier effect. In the proposed scheme, we should use the materials that have high thermal conductivity,...
The present work aims at studying the cooling performance of a thermoelectric device that integrated with integrated heat spreader (IHS) on a flip-chip plastic ball grid array (FC-PBGA) package. The new thermoelectric device herein is fabricated on the metal substrates by flip-chip assembly process. Thermal performance of the new package was comprehensive studied. The thermal resistances of IHS with/without...
In this study, we fabricated in-plane thermoelectric micro-generators (4 mm times 4 mm) based on bismuth telluride thin films by using flash evaporation method. The thermoelectric properties of as-grown thin films are lower than those of bulk materials. Therefore the as-grown thin films were annealed in hydrogen at atmospheric pressure for 1 hour in a temperature range of 200 degC. to 400degC. By...
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