Silicon‐based nanocomposites for thermoelectric application

Abstract

Here we present the realization of efficient and sustainable silicon‐based thermoelectric materials from nanoparticles. We employ a gas phase synthesis for the nanoparticles which is capable of producing doped silicon (Si) nanoparticles, doped alloy nanoparticles of silicon and germanium (Ge), SixGe1–x, and doped composites of Si nanoparticles with embedded metal silicide precipitation phases. Hence, the so‐called “nanoparticle in alloy” approach, theoretically proposed in the literature, forms a guideline for the material development. For bulk samples, a current‐activated pressure‐assisted densification process of the nanoparticles was optimized in order to obtain the desired microstructure. For thin films, a laser annealing process was developed. Thermoelectric transport properties were characterized on nanocrystalline bulk samples and laser‐sintered‐thin films. Devices were produced from nanocrystalline bulk silicon in the form of p–n junction thermoelectric generators, and their electrical output data were measured up to hot side temperatures of 750 °C. In order to get a deeper insight into thermoelectric properties and structure forming processes, a 3D‐Onsager network model was developed. This model was extended further to study the p–n junction thermoelectric generator and understand the fundamental working principle of this novel device architecture. Gas phase synthesis of composite nanoparticles; nanocrystalline bulk with optimized composite microstructure; laser‐annealed thin film.

Laser-Induced Processing of Nanoparticles and Growth of Nanowires

“…The expectation is that the pulsed laser sintering process would adjust the pore configuration of the resulting meander structure as well as the crystallinity of produced NPs, hence reducing the thermal conductivity. Furthermore, laser-assisted wet doping could incorporate, for example, P or B atoms into the material to modify the transport characteristics (Schierning et al 2016).…”

The effects of external fields in ceramic sintering

“…The expectation is that the pulsed laser sintering process would adjust the pore configuration of the resulting tortuous structure as well as the crystallinity of produced nanoparticles, hence reducing the thermal conductivity. Furthermore, laser‐assisted wet doping could incorporate, for example, P or B atoms into the material to modify the transport characteristics . Localized crystal lattice engineering in chalcogenide glasses like Sb 2 S 3 has also been demonstrated using femtosecond resolution laser pulses .…”

Enhancement Thermoelectric Properties of Cux-doped Nanostructure Bi-Sb-Te Thermoelectric Materials by Spark Plasma Sintering

“…Moreover, current available thermoelectric devices have low efficiency in comparison with heat engine [7]. Nowadays nano-structure thermoelectric materials have already attracted many attention owing to the improvement in performance of thermoelectric devices through establishing nanostructure novelty material which have already been fabricated by advanced methods and techniques for instance nanocomposites [8], quantum dots [9], and superlattices [10].…”