Decoupling phonon and carrier scattering at carbon nanotube/Bi2Te3 interfaces for improved thermoelectric performance

Zhao, Yang; Liu, Ying; Qiao, Jixiang; Song, Jang‐Kun; Mao, Pengyan; Qiu, Jianhang; Kang, Siqing; Tan, Jun; Tai, Kaiping; Liu, Chang

doi:10.1016/j.carbon.2020.08.024

Cited by 40 publications

(32 citation statements)

References 52 publications

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“…It has been stated that the energy barrier should be adjusted to 0.2 eV in order to obtain optimal energy filtering effect. [ 175 ] Some research found that increasing the CNT concentration increased electrical conductivity, [ 172,174,176,177 ] whereas others found the reverse. [ 178–181 ] The changing CNT content might explain this discrepancy.…”

Section: Discontinuous Interface Modificationmentioning

confidence: 99%

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

Lehmann

Bahrami

et al. 2021

Advanced Energy Materials

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Thermoelectric (TE) materials are prominent candidates for energy converting applications due to their excellent performance and reliability. Extensive efforts for improving their efficiency in single‐/multi‐phase composites comprising nano/micro‐scale second phases are being made. The artificial decoration of second phases into the thermoelectric matrix in multi‐phase composites, which is distinguished from the second‐phase precipitation occurring during the thermally equilibrated synthesis of TE materials, can effectively enhance their performance. Theoretically, the interfacial manipulation of phase boundaries can be extended to a wide range of materials. High interface densities decrease thermal conductivity when nano/micro‐scale grain boundaries are obtained and certain electronic structure modifications may increase the power factor of TE materials. Based on the distribution of second phases on the interface boundaries, the strategies can be divided into discontinuous and continuous interfacial modifications. The discontinuous interfacial modifications section in this review discusses five parts chosen according to their dispersion forms, including metals, oxides, semiconductors, carbonic compounds, and MXenes. Alternatively, gas‐ and solution‐phase process techniques are adopted for realizing continuous surface changes, like the core–shell structure. This review offers a detailed analysis of the current state‐of‐the‐art in the field, while identifying possibilities and obstacles for improving the performance of TE materials.

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Section: Discontinuous Interface Modificationmentioning

confidence: 99%

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

Lehmann

Bahrami

et al. 2021

Advanced Energy Materials

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“…The extreme oxygen sensitivity of CNTs leads to the p‐type characteristic in air 20,21 ; fortunately, their n‐type characteristics can be realized by treatment with amino‐substituted rylene dimides, 22 diethylenetriamine doping, and subsequent CaH 2 treatment, 23 or cationic surfactants, 24 and so forth. To date, a few publications of n‐type Bi 2 Te 3 /CNT hybrids have been reported using the magnetron sputtering technique or the hot‐press method 25–27 . For example, in 2019, Jin et al 25 reported flexible films prepared by anchoring layer‐structured highly ordered Bi 2 Te 3 nanocrystals on a CNT scaffold, which showed both n‐type high TE performance (ZT up to 0.89 at room temperature) and good flexibility.…”

Section: Introductionmentioning

confidence: 99%

“…For example, in 2019, Jin et al 25 reported flexible films prepared by anchoring layer‐structured highly ordered Bi 2 Te 3 nanocrystals on a CNT scaffold, which showed both n‐type high TE performance (ZT up to 0.89 at room temperature) and good flexibility. Later, they sequentially found that by decoupling phonon and carrier scattering at SWCNTs/Bi 2 Te 3 interfaces, the TE performance could be improved, and they further fabricated a flexible TE device based on the Bi 2 Te 3 /CNT hybrid 26 . In addition, Liu et al 27 reported flexible TE materials and devices based on a Bi 2 Te 3 /CNT hybrid fabricated using a magnetron sputtering technique.…”

Section: Introductionmentioning

confidence: 99%

“…To date, a few publications of n-type Bi 2 Te 3 / CNT hybrids have been reported using the magnetron sputtering technique or the hot-press method. [25][26][27] For example, in 2019, Jin et al 25 reported flexible films prepared by anchoring layer-structured highly ordered Bi 2 Te 3 nanocrystals on a CNT scaffold, which showed both n-type high TE performance (ZT up to 0.89 at room temperature) and good flexibility. Later, they sequentially found that by decoupling phonon and carrier scattering at SWCNTs/Bi 2 Te 3 interfaces, the TE performance could be improved, and they further fabricated a flexible TE device based on the Bi 2 Te 3 / CNT hybrid.…”

mentioning

confidence: 99%

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Construction of a cement–rebar nanoarchitecture for a solution‐processed and flexible film of a Bi₂Te₃/CNT hybrid toward low thermal conductivity and high thermoelectric performance

Chen

Zhang

et al. 2021

Carbon Energy

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Solution processability and flexibility still remain major challenges for many thermoelectric (TE) materials, including bismuth telluride (Bi2Te3), a typical and commercially available TE material. Here, we report a new solution‐processed method to prepare a flexible film of a Bi2Te3/single‐walled carbon nanotube (SWCNT) hybrid, where the dissolved Bi2Te3 ion precursors are mixed with dispersed SWCNTs in solution and recrystallized on the SWCNT surfaces to form a “cement–rebar”‐like architecture. The hybrid film shows an n‐type characteristic, with a stable Seebeck coefficient of −100.00 ± 1.69 μV K−1 in air. Furthermore, an extremely low in‐plane thermal conductivity of ∼0.33 W m−1 K−1 is achieved at 300 K, and the figure of merit (ZT) reaches 0.47 ± 0.02. In addition, the TE performance is independent of mechanical bending. The unique “cement–rebar”‐like architecture is believed to be responsible for the excellent TE performances and the high flexibility. The results provide a new avenue for the fabrication of solution‐processable and flexible TE hybrid films and will speed up the applications of flexible electronics and energy conversion.

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“…Meanwhile, the interface could also scatter phonons to reduce the lattice thermal conductivity, and finally the ZT value of the material will be further improved [ 1 ]. Experimentally, metal/semi-metal or carbon had been introduced in Bi 2 Te 3 to build heterostructures (such as Bi 2 Te 3 /Ag [ 12 , 17 ], Bi 2 Te 3 /Cu [ 12 , 18 ] Bi 2 Te 3 /Cd [ 19 ], Bi 2 Te 3 /Te [ 20 ], Bi 2 Te 3 /carbon nanotube [ 10 , 21 ]) especially by solution or sintering method to further enhanced the TE properties. Oxide layer was also introduced into the Ag/Sb 2 Te 3 system by atomic layer deposition, and the filtering effect of the corresponding interface on low-energy carriers was discussed [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Bottom-Up (Cu, Ag, Au)/Al2O3/Bi2Te3 Assembled Thermoelectric Heterostructures

Zhang

Liu

et al. 2021

Micromachines

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The interface affects the transmission behavior of electrons and phonons, which in turn determines the performance of thermoelectric materials. In this paper, metals (Cu, Ag, Au)/Al2O3/Bi2Te3 heterostructures have been fabricated from bottom to up to optimize the thermoelectric power factor. The introducing metals can be alloyed with Bi2Te3 or form interstitials or dopants to adjust the carrier concentration and mobility. In addition, the metal-semiconductor interface as well as the metal-insulator-semiconductor interface constructed by the introduced metal and Al2O3 would further participate in the regulation of the carrier transport process. By adjusting the metal and oxide layer, it is possible to realize the simultaneous optimization of electric conductivity and Seebeck coefficient. This work will enable the optimal and novel design of heterostructures for thermoelectric materials with further improved performance.

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Decoupling phonon and carrier scattering at carbon nanotube/Bi2Te3 interfaces for improved thermoelectric performance

Cited by 40 publications

References 52 publications

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

Construction of a cement–rebar nanoarchitecture for a solution‐processed and flexible film of a Bi₂Te₃/CNT hybrid toward low thermal conductivity and high thermoelectric performance

Bottom-Up (Cu, Ag, Au)/Al2O3/Bi2Te3 Assembled Thermoelectric Heterostructures

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Decoupling phonon and carrier scattering at carbon nanotube/Bi2Te3 interfaces for improved thermoelectric performance

Cited by 40 publications

References 52 publications

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

Construction of a cement–rebar nanoarchitecture for a solution‐processed and flexible film of a Bi2Te3/CNT hybrid toward low thermal conductivity and high thermoelectric performance

Bottom-Up (Cu, Ag, Au)/Al2O3/Bi2Te3 Assembled Thermoelectric Heterostructures

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Resources

About

Construction of a cement–rebar nanoarchitecture for a solution‐processed and flexible film of a Bi₂Te₃/CNT hybrid toward low thermal conductivity and high thermoelectric performance