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A method of measuring the thermal conductance and the heat capacity of a nanowire is presented. The nanowire is suspended in vacuum to ensure the thermal isolation, and the resistance is measured with respect to the square of the current to obtain the thermal conductance in the length direction. The heat capacity is evaluated by the frequency response of the 3f component of the voltage across the...
This work aims at improving the energy harvester performance by using low-dimensional thermoelectric materials. A micro-thermoelectric generator with quantum well thermocouples is developed by state-of-the-art CMOS (Complementary metal-oxide semiconductor) process. A relaxation-time model is applied to analyze the characteristic length of silicon germanium quantum well, and a thermal model is also...
In this paper, we study the enhancement of silicon absorbing properties while microstructuring its surface with cones of variable size and spacing. We simulate the optical reflectance of the structures with spikes of different dimensions. Then random maskless textured silicon, called “black silicon” is processed by reactive ion etching (RIE) under cryogenic temperatures. Using this process, three...
This paper presents the design of a compact (~1 cm3) thermoelectric (TE) generator intended to generate power locally for sensor/electronic device applications using hot gases (~100°C to 400°C). The design employs 13-mm-diameter, ~0.36-mm-thick (48 mm3) silicon-micromachined TE modules that are stacked to form a cylindrical, finned heat exchanger. The stacked structure is intended to establish a large,...
The fabrication of a miniature low power/high voltage thermoelectric convertor is described. The device which has arisen out of a requirement of the British gas industry for an autonomous source of electrical power for use in consumers' gas monitoring systems generates fractions of microwatt at several volts.<<ETX>>
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