6 Watt Segmented Power Generator Modules using Bi₂Te₃ and (InGaAs)_1-x(InAlAs)_x Elements Embedded with ErAs Nanoparticles

Abstract

We report the fabrication and characterization of segmented element power generator modules of 16 x 16 thermoelectric elements consisting of 0.8 mm thick Bi 2 Te 3 and 50 μm thick ErAs:(InGaAs) 1-x (InAlAs) x with 0.6% ErAs by volume. Erbium Arsenide metallic nanoparticles are incorporated to create scattering centers for middle and long wavelength phonons, and to form local potential barriers for electron filtering. The thermoelectric properties of ErAs:(InGaAs) 1-x (InAlAs) x were characterized in terms of electrical conductivity and Seebeck coefficient from 300 K up to 830 K. Generator modules of Bi 2 Te 3 and ErAs:(InGaAs) 1-x (InAlAs) x segmented elements were fabricated and an output power of 6.3 W was measured. 3D finite modeling shows that the performance of thermoelectric generator modules can further be enhanced by the improvement of the thermoelectric properties of the element materials, and reducing the electrical and thermal parasitic losses.