Thermoelectric Modules Based on Silicides – Development and Characterization

Tarantik, Karina R.; König, Jan; Jägle, Martin; Heuer, Jana; Horzella, Jan; Mahlke, Andreas; Vergez, Marc; Bartholomé, Kilian

doi:10.1016/j.matpr.2015.05.080

Cited by 11 publications

(5 citation statements)

References 6 publications

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“…Mg2(Si,Sn) is less costly yet providing the equivalent performance compared with half-Heusler and Skutterudites alloys, which are more prominently used in waste heat recovery industry [3,19]. Some silicide-based modules have already been reported [20][21][22][23][24][25][26], showing a performance of 0.9 to 4 % of efficiency and a maximal power density between 0.3 and 1 W/cm², often combining n-type Mg2Si and p-type HMS legs. The development of a fully Mg2(Si,Sn)-based TEG is still at an early stage.…”

Section: Introductionmentioning

confidence: 99%

Aluminum as promising electrode for Mg2(Si,Sn)-based thermoelectric devices

Camut

Pham

Truong

et al. 2021

Materials Today Energy

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Section: Introductionmentioning

confidence: 99%

Aluminum as promising electrode for Mg2(Si,Sn)-based thermoelectric devices

Camut

Pham

Truong

et al. 2021

Materials Today Energy

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“…A few silicide-based modules combining n-type Mg 2 Si and p-type HMS (High-Manganese Silicide) legs were already reported [17][18][19][20][21][22][23][24]. However, the development of a fully Mg 2 (Si,Sn)-based TEG remains at an early stage.…”

Section: Introductionmentioning

confidence: 99%

Overcoming Asymmetric Contact Resistances in Al-Contacted Mg2(Si,Sn) Thermoelectric Legs

et al. 2021

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Thermoelectric generators are a reliable and environmentally friendly source of electrical energy. A crucial step for their development is the maximization of their efficiency. The efficiency of a TEG is inversely related to its electrical contact resistance, which it is therefore essential to minimize. In this paper, we investigate the contacting of an Al electrode on Mg2(Si,Sn) thermoelectric material and find that samples can show highly asymmetric electrical contact resistivities on both sides of a leg (e.g., 10 µΩ·cm2 and 200 µΩ·cm2). Differential contacting experiments allow one to identify the oxide layer on the Al foil as well as the dicing of the pellets into legs are identified as the main origins of this behavior. In order to avoid any oxidation of the foil, a thin layer of Zn is sputtered after etching the Al surface; this method proves itself effective in keeping the contact resistivities of both interfaces equally low (<10 µΩ·cm2) after dicing. A slight gradient is observed in the n-type leg’s Seebeck coefficient after the contacting with the Zn-coated electrode and the role of Zn in this change is confirmed by comparing the experimental results to hybrid-density functional calculations of Zn point defects.

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“…Furthermore, magnesium silicides are a technologically relatively advanced material class with systematic contacting studies available [18][19][20][21][22], fabrication and analysis of lab prototypes for thermoelectric modules [23][24][25][26][27][28] and companies like Alphabet Energy commercializing Mg 2 Si-based thermoelectric generators.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric performance of Li doped, p-type Mg2(Ge,Sn) and comparison with Mg2(Si,Sn)

et al. 2016

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Solid solutions with chemical formulaMg 2 (Si,Ge,Sn) are promising thermoelectric materials with very good properties for the n-type material but significantly worse for the p-type. For power generation applications good n-and p-type materials are required and it has been shown recently that Li doping can enhance the carrier concentration and improve the thermoelectric properties for p-type Mg 2 Si 1x Sn x .We have investigated the potential of p-type Mg 2 (Ge,Sn) by optimizing Mg 2 Ge 0.4 Sn 0.6 using Li as dopant. We were able to achieve high carrier concentrations (1.4 × 10 20 cm −3) and relatively high hole mobilities resulting in high power factors of 1.7 × 10 −3 W m −1 K −2 at 700 K, the highest value reported so far for this class of material. Exchanging Ge by Si allows for a systematic comparison of Mg 2 (Ge,Sn) with Mg 2 (Si,Sn) and shows that Si containing samples exhibit a lower power factor but also a lower thermal conductivity resulting in comparable thermoelectric figure-of-merit. The data is furthermore analyzed in the framework of a single parabolic band model to gain insight on the effect of composition on band structure. 2 , here is the electrical conductivity, the thermal conductivity, the Seebeck coefficient, and the absolute temperature. A large fraction of the potentially available waste heat can be found in the mid-temperature region

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Thermoelectric Modules Based on Silicides – Development and Characterization

Cited by 11 publications

References 6 publications

Aluminum as promising electrode for Mg2(Si,Sn)-based thermoelectric devices

Aluminum as promising electrode for Mg2(Si,Sn)-based thermoelectric devices

Overcoming Asymmetric Contact Resistances in Al-Contacted Mg2(Si,Sn) Thermoelectric Legs

Thermoelectric performance of Li doped, p-type Mg2(Ge,Sn) and comparison with Mg2(Si,Sn)

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