In the paper the p-type of conductivity polycrystalline thin films were received on the basis of PbSnAgTe (LATT) materials deposited on the mica-muscovite substrate. The temperature and thickness dependences of conductivity, current carriers mobility and specific thermoelectric power were investigated for these films. It is shown that scattering on acoustic phonons is the dominant mechanism at above room temperature. The presence of oscillations in profiles of thermoelectric parameters of specific electrical conductivity and Seebeck coefficients is experimentally obtained. The theoretical explanation of oscillations is explained within the framework of model of rectangular potential well with infinitely high walls. The estimation of the efficiency of thermoelectric materials , namely, the dimensionless thermoelectric figure of merit is ZT ∼ (1.2–1.5).

Low-dimensional systems on the base of PbSnAgTe (LATT) compounds for thermoelectric application

Bi0.88−xZnxSb0.12 alloys with x = 0.00, 0.05, 0.10, and 0.15 were prepared using hydrothermal synthesis in combination with evacuating-and-encapsulating sintering. The effects of partial Zn substitution for Bi and different sintering temperatures on the thermoelectric properties of Bi0.88−xZnxSb0.12 alloys were investigated between 25 K and 425 K. Both the electrical conductivity and absolute thermopower are enhanced for the set of alloys sintered at 250 °C. The maximum power factor of 57.60 μW cm−1 K−2 is attained for the x = 0.05 alloy sintered at 250 °C. As compared with Zn-free Bi0.88Sb0.12, both the total thermal conductivity and lattice component are reduced upon Zn doping. Bipolar conduction is observed in both electronic and thermal transport. The maximum zT of 0.47 is attained at 275 K for the x = 0.05 alloy sintered at 250 °C.

/pdf/enhanced-thermoelectric-properties-of-hydrothermally-2qtlbgtnj6.pdf

Enhanced thermoelectric properties of hydrothermally synthesized Bi0.88−xZnxSb0.12 nanoalloys below the semiconductor–semimetal transition temperature

A huge concern regarding global warming, as well as the depletion of natural fuel resources, has led to a wide search for alternative energy sources. Due to their high reliability and long operation time, thermoelectric generators are of significant interest for waste heat recovery and power generation. The main disadvantage of TEGs is the low efficiency of thermoelectric commercial modules. In this work, a unique design for a multilayer TE unicouple is suggested for an operating temperature range of 50–600 °C. Two types of thermoelectric materials were selected: «low temperature» n-and p-type TE materials (for the operating temperature range of 50–300 °C) based on Bi2Te3 compounds and «middle temperature» (for the operating temperature range of 300–600 °C) n- and p-type TE materials based on the PbTe compound. The hot extrusion technology was applied to fabricate n- and p-type low-temperature TE materials. A unique design of multilayer TEG was experienced to achieve an efficiency of up to 15%. This allows for the possibility of extracting this amount of electrical power from the heat generated for domestic and water heating. 

https://www.mdpi.com/1996-1073/15/11/3960/pdf?version=1653645347

Development of a High Perfomance Gas Thermoelectric Generator (TEG) with Possibible Use of Waste Heat

Triboelectric nanogenerator (TENG) can convert tiny mechanical energy into precious electrical energy. Constant improvements to the output performance of TENG is not only the driving force for its sustainable development, but also the key to expand its practical applicability in modern smart devices. However, most previous studies were conducted at room temperature, ignoring the influence of temperature on the output performance of TENG. Additionally, due to thermionic emission effect, the electrons transferred to a dielectric surface can be released into a vacuum after contact electrification. Therefore, TENG cannot maintain an effective electrical output under high-temperature conditions. Here, a series of high-temperature operatable flexible TENGs (HO-TENGs) based on nanofiber/microsphere hybrid membranes (FSHMs) was fabricated by electrospinning and electrospraying. The Voc of HO-TENG is 212 V, which is 2.33 times higher than that of control TENG. After 10,000 cycle stability tests, the HO-TENG shows excellent durability. Especially, this HO-TENG can maintain 77% electrical output at 70 °C compared to room temperature, showing excellent high-temperature operability. This study can not only provide a reference for the construction of advanced high-performance TENG, but also provide a certain experimental basis for efficient collection of mechanical energy in high-temperature environment and promote the application of TENG devices in harsh environments.

/pdf/harsh-environmental-tolerant-and-high-performance-ctll60qb.pdf

Harsh Environmental-Tolerant and High-Performance Triboelectric Nanogenerator Based on Nanofiber/Microsphere Hybrid Membranes

Phase composition and structural state of polycrystalline ingots of undoped lead telluride synthesized under the influence of various technological factors have been studied. Thermoelectric samples have been obtained by powder pressing method. Measurements of the temperature dependences of conductivity, Seebeck coefficient and thermal conductivity have been made. The influence of annealing temperature on thermoelectric properties of the samples has been investigated.

Thermoelectric Materials Based on Samples of Microdispersed PbTe and CdTe

Development of the high performance thermoelectric unicouple based on Bi2Te3 compounds

/pdf/thermoelectric-properties-of-bismuth-doped-tin-telluride-1uqwpf4j4l.pdf

O.M. Matkivsky

Papers

Development of the high performance thermoelectric unicouple based on Bi2Te3 compounds

Thermoelectric Properties of Bismuth-Doped Tin Telluride SnTe:Bi