Organic Crystals of p - Type TTT2I3 and n - Type TTT(TCNQ)2 as Prospective Thermoelectric Materials for Biomedical Sensors

P-type Bi0.5Sb1.5Te3 compounds doped with 3wt% Te were fabricated by spark plasma sintering and their mechanical and thermoelectric properties were investigated. The sintered compounds with the bending strength of more than 50MPa and the figure-of-merit 2.9×10-3/K were obtained by controlling the mixing ratio of large powders (PL) and small powders (PS). Compared with the conventionally prepared single crystal thermoelectric materials, the bending strength was increased up to more than three times and the figure-of-merit Z was similar those of single crystals. It is expected that the mechanical properties could be improved by using hybrid powders without degradation of thermoelectric properties.

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Effect of Microwave Processing and Glass Inclusions on Thermoelectric Properties of P-Type Bismuth Antimony Telluride Alloys for Wearable Applications

Energies ◽

10.3390/en13174524 ◽

2020 ◽

Vol 13 (17) ◽

pp. 4524

Author(s):

Amin Nozariasbmarz ◽

Daryoosh Vashaee

Keyword(s):

Seebeck Coefficient ◽

Thermoelectric Materials ◽

Room Temperature ◽

Electronic Devices ◽

Microwave Processing ◽

Glass Inclusion ◽

Wearable Electronic ◽

P Type ◽

Wearable Electronic Devices ◽

Body Heat

Depending on the application of bismuth telluride thermoelectric materials in cooling, waste heat recovery, or wearable electronics, their material properties, and geometrical dimensions should be designed to optimize their performance. Recently, thermoelectric materials have gained a lot of interest in wearable electronic devices for body heat harvesting and cooling purposes. For efficient wearable electronic devices, thermoelectric materials with optimum properties, i.e., low thermal conductivity, high Seebeck coefficient, and high thermoelectric figure-of-merit (zT) at room temperature, are demanded. In this paper, we investigate the effect of glass inclusion, microwave processing, and annealing on the synthesis of high-performance p-type (BixSb1−x)2Te3 nanocomposites, optimized specially for body heat harvesting and body cooling applications. Our results show that glass inclusion could enhance the room temperature Seebeck coefficient by more than 10% while maintaining zT the same. Moreover, the combination of microwave radiation and post-annealing enables a 25% enhancement of zT at room temperature. A thermoelectric generator wristband, made of the developed materials, generates 300 μW power and 323 mV voltage when connected to the human body. Consequently, MW processing provides a new and effective way of synthesizing p-type (BixSb1−x)2Te3 alloys with optimum transport properties.

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Nanostructured Organic Crystals as Prospective Thermoelectric Materials for Infrared Sensors

IFMBE Proceedings - 4th International Conference on Nanotechnologies and Biomedical Engineering ◽

10.1007/978-3-030-31866-6_26 ◽

2019 ◽

pp. 121-125

Author(s):

I. I. Sanduleac ◽

S. C. Andronic ◽

A. I. Casian

Keyword(s):

Thermoelectric Materials ◽

Organic Crystals ◽

Infrared Sensors

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Structure Design for High Performance n-Type Polymer Thermoelectric Materials

Chinese Physics B ◽

10.1088/1674-1056/ac3a64 ◽

2021 ◽

Author(s):

Qi Zhang ◽

Hengda Sun ◽

Meifang Zhu

Keyword(s):

Conjugated Polymers ◽

Thermoelectric Materials ◽

High Performance ◽

Waste Heat ◽

Building Blocks ◽

Structure Design ◽

Potential Candidate ◽

Polymer Backbone ◽

P Type ◽

Polymer Thermoelectric

Abstract Organic thermoelectric (OTE) materials have been regarded as a potential candidate to harvest waste heat from complex, low temperature surfaces of objects and convert it into electricity. Recently, n-type conjugated polymers as organic thermoelectric materials have aroused intensive research in order to improve their performance to match up with their p-type counterpart. In this review, we discuss aspects that affect the performance of n-type OTEs, and further focus on the effect of planarity of backbone on doping efficiency and eventually the TE performance. We then summarize strategies such as implementing rigid n-type polymer backbone or modifying conventional polymer building blocks for more planar conformation. In the outlook part, we conclude forementioned devotions and point out new possibility that may promote the future development of this field.

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Substitution Versus Full-Heusler Segregation in TiCoSb

Metals ◽

10.3390/met8110935 ◽

2018 ◽

Vol 8 (11) ◽

pp. 935 ◽

Cited By ~ 1

Author(s):

Maryana Asaad ◽

Jim Buckman ◽

Jan-Willem Bos

Keyword(s):

Powder Metallurgy ◽

Power Factor ◽

Thermoelectric Materials ◽

Room Temperature ◽

The Difference ◽

P Type ◽

Full Heusler ◽

Thermal Conductivities

Half-Heuslers (HHs) are promising thermoelectric materials with great compositional flexibility. Here, we extend work on the p-type doping of TiCoSb using abundant elements. Ti0.7V0.3Co0.85Fe0.15Sb0.7Sn0.3 samples with nominal 17.85 p-type electron count were investigated. Samples prepared using powder metallurgy have negative Seebeck values, S ≤ −120 µV K−1, while arc-melted compositions are compensated semiconductors with S = −45 to +30 µV K−1. The difference in thermoelectric response is caused by variations in the degree of segregation of V(Co0.6Fe0.4)2Sn full-Heusler and Sn phases, which selectively absorb V, Fe, and Sn. The segregated microstructure leads to reduced lattice thermal conductivities, κlat = 4.5−7 W m−1 K−1 near room temperature. The largest power factor, S2/ρ = 0.4 mW m−1 K−2 and ZT = 0.06, is observed for the n-type samples at 800 K. This works extends knowledge regarding suitable p-type dopants for TiCoSb.

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