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… Show more
“…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).…”
This chapter presents a review of work on the laser synthesis and functionalization of semiconductor nanowires and nanoparticles in the context of fabricating high-performance electronic devices. Laser-aided sintering of nanoparticles (NPs) is examined. Laser irradiation can access time scales from the continuous to ultrafast and length scales down to submicron, therefore enabling precise control of the induced temperature field. Furthermore, the coupling of the laser energy with the target material is a strong function of the wavelength and is sensitive to the size of the irradiated structure, particularly as the dimensions shrink to the nanoscale range. In this case, one may expect resonant effects allowing efficient radiant energy coupling and processing. Vapor-liquid-solid (VLS) mechanism
“…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).…”
This chapter presents a review of work on the laser synthesis and functionalization of semiconductor nanowires and nanoparticles in the context of fabricating high-performance electronic devices. Laser-aided sintering of nanoparticles (NPs) is examined. Laser irradiation can access time scales from the continuous to ultrafast and length scales down to submicron, therefore enabling precise control of the induced temperature field. Furthermore, the coupling of the laser energy with the target material is a strong function of the wavelength and is sensitive to the size of the irradiated structure, particularly as the dimensions shrink to the nanoscale range. In this case, one may expect resonant effects allowing efficient radiant energy coupling and processing. Vapor-liquid-solid (VLS) mechanism
“…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 .…”
Field‐assisted processing techniques can enhance the kinetics of powder synthesis, accelerate sintering processes, and drive phase transformations at significantly lower temperatures compared to conventional methods. However, the exact nature of this nonthermal interaction between field and matter remains vastly speculative. A 2‐day workshop on “Electromagnetic Effects in Materials Synthesis” was organized at Carnegie Mellon University (Pittsburgh, USA) in June 2017, jointly sponsored by the U.S. National Science Foundation and the U.S. Office of Naval Research. This workshop gathered the scientific community working on field‐assisted techniques of materials processing. Inspired by the discussions held at the workshop, this paper summarizes the advancements to date and opens scientific questions and research opportunities in the three major field‐assisted sintering techniques (laser, microwave, and flash sintering). Significant challenges remain in (a) experimental design, measurements, and computational simulations to distinguish the nonthermal effects of the externally applied fields from conventional thermal phenomena; and (b) identifying fundamental mechanisms behind low temperature, nonthermal effects that produce phase transitions and microstructural evolution in materials under externally applied fields. We also present the recent developments in multiscale characterization techniques and the theory and modeling efforts, which aim to tackle the aforementioned grand multidisciplinary challenges facing researchers.
“…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].…”
Nanostructure Cux-doped Bi0.5Sb1.5-xTe3 thermoelectric materials was successfully prepared by Mechanical alloys and spark plasma sintering. In the reasearch, the crystallinity, particle size, and chemical composition were characterized by XRD, EDS, respectively. Thermoelectric properties with a maximum ZT value up to 1.17 has been obtained at 407 K in prepared Cu0.04-doped Bi0.5Sb1.496Te3 sample. The achieved higher ZT value is attributed that Cu as doping at the Sb sites introduced additional holes to enhance carrier mobility and Cu dopants interrupted the periodicity of lattice vibration to decrease lattice thermal conductivity. It is suggested that the as-prepared nanostructure Cux-doped Bi0.5Sb1.5-xTe3 thermoelectric materials has high potential for thermoelectric energy conversion application.
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