Flexible thermoelectrics based on ductile semiconductors

Yang, Qingyu; Yang, Shiqi; Qiu, Pengfei; Peng, Liming; Wei, Tian‐Ran; Zhang, Zhen; Shi, Xun; Chen, Lidong

doi:10.1126/science.abq0682

Cited by 245 publications

(168 citation statements)

References 65 publications

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“…Although ductile inorganic materials, typically the Ag(Cu)–S(Se/Te) system, reveal excellent flexibility and TE performance, − most conventional bulk or three-dimensional (3D) inorganic materials, such as Bi 2 Te 3 , CoSb 3 , PbTe, SiGe, etc., are usually rigid and brittle because of covalent/ionic bonding. However, they can become flexible when made thin enough.…”

Section: Introductionmentioning

confidence: 99%

MXene Nanosheet/Organics Superlattice for Flexible Thermoelectrics

Wang

Chen

Cao

et al. 2022

ACS Appl. Nano Mater.

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Two-dimensional (2D) materials with outstanding electronic transport properties are rigid against bending because of strong in-plane covalent bonding and intrinsically flexible because of the lack of out-of-plane constraint and thus are considered to be promising for flexible thermoelectrics (TEs). As a typical 2D material, MXene, however, exhibited a restricted TE performance because the termination groups and guest molecules in MXene nanosheets introduced by acid etching and reassembly deteriorate intra/interflake conduction. This work realized increases in both the carrier concentration and intra/interflake mobility by the construction of a MXene nanosheet/organic superlattice (SL) and composition engineering, attributed to electron injection, intercoupling strengthening, and defect reduction at the nanosheet edges. An electrical conductivity increased by 5 times, to 2.7 × 105 S m–1, led to power factors of up to ∼33 μW m–1 K–2, which is above the state-of-the-art for similar materials, almost by a factor of 10. A TE module comprising four SL film legs could yield 58.6 nW power at a temperature gradient of 50 K. Additionally, both the annealed film and the corresponding module exhibited excellent reproducibility and stability. Our results provide a strategy to tailor the TE performance of 2D-material films through SL construction and composition engineering.

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Section: Introductionmentioning

confidence: 99%

MXene Nanosheet/Organics Superlattice for Flexible Thermoelectrics

Wang

Chen

Cao

et al. 2022

ACS Appl. Nano Mater.

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“…Based on the above three effects, TE materials and devices can realize direct and reversible conversion between electrical and thermal energy. [30][31][32][33][34][35][36] Fig. 2(a) shows the principle of TE power generation.…”

Section: Thermoelectric Cooling Principlesmentioning

confidence: 99%

Solid-state cooling: thermoelectrics

Qin

Wang

et al. 2022

Energy Environ. Sci.

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“…Besides, the reinforced ductility in metal chalcogenides by the alloyed sulfur element has also been reported in AgCu(Se,S,Te) solid solutions. 25 Albeit the improvement, the fabrication procedure of Ag 2 (S/Se) thin films is still focused on the bottom-up synthesis, especially the vacuum-assisted filtration of nanosized Ag 2 (S/Se) structures on polymer substrates 15,16,24 and forming composites with polymer matrixes, 17,18 which are complex and time-consuming, in need of precise control of Ag 2 (S/Se) size and nanostructures. The agglomeration of nanoparticles is difficult to avoid in those nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

From Brittle to Ductile: A Scalable and Tailorable All-Inorganic Semiconductor Foil through a Rolling Process toward Flexible Thermoelectric Modules

Liang

Zhang

Wan

2022

ACS Appl. Mater. Interfaces

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Inorganic thermoelectric (TE) materials with outstanding capacity for energy conversion are expected to be promising eco-friendly and renewable power sources, but they are always intrinsically brittle, restricting their development in flexible TE electronics. Therefore, we have developed a facile manufacturing method of large-scale all-inorganic silver chalcogenide foils and flexible TE generators in this work. A rolling process, as an effective and facile molding technique, is applied in ductile TE materials. The figure-of-merit for flexibility of this free-standing foil is in the range of 0.02−0.13, suggesting the superior flexibility of the allinorganic TE foils. A high TE figure-of-merit ZT of 0.47 at room temperature is reached for Ag 2 S 0.45 Se 0.45 Te 0.1 , which is one of the most promising room-temperature ZTs among flexible TE materials. A proof-of-concept flexible TE generator based on silver chalcogenide foils achieves an open-circuit voltage of 1.19 mV and an output power density of 1.8 mW/m 2 with a temperature difference of 2.7 °C across the TE leg, showing great potential in heat-to-electricity conversion.

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Flexible thermoelectrics based on ductile semiconductors

Cited by 245 publications

References 65 publications

MXene Nanosheet/Organics Superlattice for Flexible Thermoelectrics

MXene Nanosheet/Organics Superlattice for Flexible Thermoelectrics

Solid-state cooling: thermoelectrics

From Brittle to Ductile: A Scalable and Tailorable All-Inorganic Semiconductor Foil through a Rolling Process toward Flexible Thermoelectric Modules

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