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A theoretical model of thermoelectric device was proposed that uses automobile exhaust gas for power generation. According to the principal of Fourier's law of heat conduction and the Peltier effect, a thermodynamics analysis was conducted in which expressions for calculating the output power and the efficiency were derived. Some influencing factors, such as the temperature distribution of the TEG...
This paper seeks to demonstrate the performance of a thermoelectric energy recovery module (TERM). The TERM aims to convert the waste heat from power amplifier (PA) transistors into the useful power. The TERM contains a thermoelectric generator (TEG), a heat spreader, and a heat sink. A first order prototype of the TERM is generated and used as a test vehicle. Experimental setup mainly consists of...
We report the first demonstration of phase change memory cells utilizing nickel monosilicide (NiSi) or platinum monosilicide (PtSi) as the bottom electrode or heater material. This work enables the integration of PCRAM directly on the silicided drain regions of MOSFETs, allowing compact integration with reduced process complexity and cost. Low reset current of 0.8 mA was achieved for contact dimensions...
Nowadays, the demand for the printed wiring board (PWB) of the environment harmony type is rising rapidly. We have developed a new halogen-free material with low coefficients of thermal expansion (CTE), which will be applied to the plastic packages such as FC-BGA and CSP. The original resin system and filler treatment technique named FICS (filler interphase control system) were applied to the material...
Halogen free material has been developed for years and recently, it catch the focus again. Besides the regulation in each country, the pressure from Green Peace is huge since they will release quarterly the ranking. Green Peace released a film showing the process of disassembling consumer product, in which they found too many component with halogen inside. This film hurt the company's image in environmental...
In phase change memories, the crystalline to amorphous phase transition is strongly affected by the cell geometry. In this paper, we study the amorphization process by analyzing the effects of amorphizing (RESET) pulses on the phase distribution inside the active chalcogenide portion of the memory cell. The purpose is to investigate how the shape and the volume of the amorphous cap are affected by...
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...
The generation of micro-bubbles using localized muwatt heating of carbon nanotubes (CNTs) is presented in this paper. Dielectrophoretic force is used to form CNTs between micro metal electrodes. The contact of the metal electrodes and the CNTs is fixed by a thin film of SiO2. The localized heat generation by CNTs is provided by a DC current which induces a temperature increase due to resistive heating...
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...
The real time monitoring and control of resistance spot welds is a problem of critical importance in automotive and many other manufacturing industries. However, till this date, there are no reliable, low-cost, non-destructive techniques for predicting the size and strength of the weld nuggets in real time. This paper investigates the usage of voltage, current, and force data for the above tasks....
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