Enhancing the thermoelectric efficiency in p-type Mg₃Sb₂via Mg site co-doping

Abstract

The Mg3Sb2 based Zintl compounds are promising thermoelectric materials due to the abundance of magnesium and antimony in nature. However, the main hindrance in realizing the full potential of Mg3Sb2...

Thermoelectric properties of Ag-doped CuI: a temperature dependent optical phonon study

“…Due to the lower charge density, Ag-doped CuI has higher Seebeck coefficient values than that of undoped CuI in the temperature range of 150 K to 350 K, as the Seebeck coefficient is inversely proportional to the carrier concentration. 36 Above 350 K, the S value is almost the same for both samples. The simultaneous decrease in electrical conductivity and increase in the Seebeck coefficient with an increase in temperature can be explained by the decrease in carrier concentration with an increase in This journal is © the Owner Societies 2022 temperature.…”

“…Among the various TE materials investigated for specific applications within the room temperature and mid-temperature range, such as-tellurides, 26,27 selenides, [28][29][30][31][32] and antimonides, [33][34][35][36][37] copper iodide (CuI) possesses the desired characteristics to be a potential near room temperature TE material such as its non-toxicity and abundance of constituent elements. 38 CuI exists in three phases, namely, g-CuI with a zinc blende structure (below 643 K), b-CuI with a wurtzite structure (in the temperature range of 643-663 K), and a-CuI with a rocksalt structure (above 663 K).…”

Giant Thermoelectric Efficiency of Single-Filled Skutterudite Nanocomposites: Role of Interface Carrier Filtering

“…Not only ZT but also the average value of ZT known as ZT avg has to be significantly enhanced in the working temperature range for a better performance of the TE device. The ZT ave depends on the ZT values and can be calculated using the following equation as normalZ normalT a v e = 1 T H − T C ∫ T C T H normalZ normalT .25em normald T where T H , and T C respectively, are the hot side and the cold side temperature of the TE device.…”

Enhanced Thermoelectric Performance in SmMg2Bi2 via Ca-Alloying and Ge-Doping

“…The solid line in Figure b is the fitting result of Sm 1– x Ca x Mg 2.15 Bi 2 by the Debye–Callaway model. The κ L of the SmMg 2.15 Bi 2 exhibits a dependence close to T –1 , indicating that phonon–phonon Umklapp scattering plays a major role . However, the κ L of Sm 1– x Ca x Mg 2.15 Bi 2 ( x = 0.1, 0.3, 0.5, 0.7, and 0.9) samples is less dependent on T and gradually approaches T –0.5 , indicating that in addition to phonon–phonon Umklapp scattering, there is also point defect scattering .…”

“…Zhou et al proved that Zintl phase YbMg 2 Sb 2 is a promising thermoelectric material ( zT ∼ 0.60@773 K) . However, for CaMg 2 Bi 2 , YbMg 2 Bi 2 , EuMg 2 Bi 2 , and BaZn 2 Sb 2 , and other compounds in the AB 2 X 2 system, the main drawback is the bipolar effect: , the minor carriers caused by thermal excitation suppress the high-temperature Seebeck coefficient and lead to the reduction in power factor . Therefore, suppressing the bipolar effect is one of the main ways to improve the thermoelectric performance of AB 2 X 2 compounds.…”