The present work is focus on thermoelectric materials synthesized by economical technique and less production time for low-cost thermoelectric module fabrication. Bi x Sb 2-x Te 3 polycrystalline with x = 1.6 for n-type and x = 0.45 for p-type thermoelectric materials were synthesized using two different methods, hot pressing and cold pressing process. The thermoelectric properties were measured at room temperature. The obtained ingots were cut into pellets of 3.5x3.5 mm 2 in cross-section and 3.8 mm in height. Two kinds of thermoelectric modules consist of seven pairs of n-p pellets from each process were constructed on aluminum substrates with polymer layer and copper layer on the top. The performances of the two modules were evaluated with temperature difference between hot side and cold side up to 100 o C. The internal resistance of hot pressing material modules is 152 mΩ, the open circuit generated voltage is 152 mVK -1 . For cold pressing materials module, the internal resistance is 175 mΩ, the opened circuit voltage generated is 1.75 mVK -1 .The maximum output power of 70.1mW and 71.1 mW at 100 o C in temperature difference were obtained from the hot pressing material module and the cold pressing materials module respectively.
A long pulsed laser ablation with a moving target at high speed technique was applied to prepare tellurium nanoparticles from a tellurium target under argon gas at atmospheric pressure. The prepared nanoparticles were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), and X-ray diffraction (XRD). The influence of the moving speed of the target on the size, morphology and crystallographic structure of the nanoparticles was investigeated. The results show that for the target moving at high speed without burning of the target the production of isolated nanoparticles is obtained. The diameter of the nanoparticles is ranging from 30 to 200 nm.
Nanopowders of n-type (Bi0.95Sb0.05)2(Te0.95Se0.05)3 and p-type (Bi0.2Sb0.8)2Te3 have been synthesized by laser fracture of micron-sized powders in water. These alloys are the best conventional thermoelectric materials for use in room temperature applications. The nanopowders have been characterized by x-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The nanopowders have been mechanically mixed in different ratios with the micron sized powders. These mixtures have then been cold pressed in order to perform thermoelectric characterization and to see the influence of nano-particle inclusions on the transport properties.
The short-time-consumption melting and hot pressing processes were used to synthesize n-type and p-type Bi-Sb-Te thermoelectric materials. The synthesis materials were characterized and used for the module fabrication. The aluminium substrate was used instead of alumina substrate because it is easy to cut and to avoid fragility of the module. The performance of 20 x 20 mm2 prototype thermoelectric module consists of 7 pairs of n-type and p-type Bi-Sb-Te thermoelectric materials was investigated and then compared its performance to 40 mm x 40 mm commercial module. The output power densities as a function of temperature difference across the devices and open circuit voltages from the module are reported.
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