Effect of backbone structure on the thermoelectric performance of indacenodithiophene-based conjugated polymers

Wei, Chaoliang; Wang, Luhai; Pan, Chengjun; Chen, Zhongming; Zhao, Hongbin; Wang, Lei

doi:10.1016/j.reactfunctpolym.2019.05.015

Cited by 10 publications

(8 citation statements)

References 51 publications

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“…Herein, we selected the indacenodithiophene (IDT) building block as the OTE material since the IDT skeleton has two thiophene rings attached with a central benzene ring that provide strong intermolecular interactions with ordered packing [ 26 , 27 , 28 ], which is beneficial for improving the electrical conductivity of OTE materials. IDT-based polymers have been widely used in organic field effect transistor (OFET) and solar cell applications [ 29 , 30 , 31 ]; however, although research on its TE properties has also been reported [ 32 , 33 ], the TE performance is still very low, and the detailed structure–property relationships are not comprehensive. In addition, we have recently reported IDT-based composite thermoelectric materials and found that the composites showed good performance with power factor of 161.34 mW/m −1 K 2 [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Structure and Doping Optimization of IDT-Based Copolymers for Thermoelectrics

Liu

Xie

et al. 2020

Polymers

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π-conjugated backbones play a fundamental role in determining the thermoelectric (TE) properties of organic semiconductors. Understanding the relationship between the structure–property–function can help us screen valuable materials. In this study, we designed and synthesized a series of conjugated copolymers (P1, P2, and P3) based on an indacenodithiophene (IDT) building block. A copolymer (P3) with an alternating donor–acceptor (D-A) structure exhibits a narrower band gap and higher carrier mobility, which may be due to the D-A structure that helps reduce the charge carrier transport obstacles. In the end, its power factor reaches 4.91 μW m−1 K−2 at room temperature after doping, which is superior to those of non-D-A IDT-based copolymers (P1 and P2). These results indicate that moderate adjustment of the polymer backbone is an effective way to improve the TE properties of copolymers.

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Section: Introductionmentioning

confidence: 99%

Structure and Doping Optimization of IDT-Based Copolymers for Thermoelectrics

Liu

Xie

et al. 2020

Polymers

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“…The maximum value of the power factor is 23.89 μW/mK 2 at a temperature difference of 100 °C only. This is about 859 times greater than that of pure PPy (0.0278 μW/mK 2 ), which is significantly higher than those of many other recently reported TE materials. − More improved results may be obtained by varying and optimizing the synthesis conditions like the time of reaction, concentration of oxidizing agent, and nature of oxidizing agent; however, this article illustrates the use of Te as an exclusive way for improving the TE properties of PPy.…”

Section: Resultsmentioning

confidence: 77%

Low Interfacial Energy Barrier and Improved Thermoelectric Performance in Te-Incorporated Polypyrrole

et al. 2020

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Controlled carrier dynamics and energy band engineering in polymer systems can provide a wider scope for studying the thermoelectric (TE) performance of such systems. With such an objective, polypyrrole (PPy) powders were prepared, incorporating a small amount of tellurium (Te) during the polymerization of pyrrole. The polymerization process was conducted through an oxidative chemical polymerization technique using ammonium peroxydisulfate (APS) as an oxidizing agent. The crystal structure, morphological, optical, and electrical transport properties were studied to explore the possibility of the better performance of PPy as a thermoelectric material when incorporated with Te. Since achieving a high thermo emf at a considerably low temperature difference is of great significance, and the thermoelectric performances of the prepared samples were studied in a 100 °C temperature difference range in this work. A TE power factor of as much as 23.89 μW/mK2 has been recorded for Te-incorporated PPy, which is about 859 times larger than that of pure PPy. This has been achieved by influencing the carrier dynamics in the system mainly in two ways: first, by inducing a carrier-filtering effect acquired by lowering the interfacial energy barrier between the polymer and Te and, second, by improving the carrier transport over the polymer chains with enhanced carrier hopping. As a result, a noticeably improved electrical conductivity of 0.472 S/cm and an exceptionally high Seebeck coefficient of 0.74 mV/°C have been recorded.

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“…Recently, several conjugated polymers constructed from copolymerization of EDOT with other electron rich building blocks have also been synthesized and investigated as p-type TE materials. [39][40][41][42][43] Moreover, in our previous report, constructing DPP based D-A alternate conjugated polymer with EDOT have also shown promising TE performance. 44 In this work, we designed and synthesized a series of random copolymers based on a typical D-A type conjugated polymer.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of thermoelectric properties of D‐A conjugated polymer through constructing random copolymers with more electronic donors

Gao

et al. 2021

Journal of Polymer Science

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Developing new D-A conjugated polymer system for thermoelectric (TE) application is highly desirable. Herein, a series of random copolymers by incorporating 3,4-ethylenedioxythiophene (EDOT) electron rich units into a diketopyrrolopyrrole (DPP) D-A conjugated polymer were designed and synthesized. Compared to the alternating conjugated copolymer PDPP-3T, the HOMO level of the random copolymers are increased as part of the electron deficiency acceptor DPP units in the polymer chain were superseded by electron rich EDOT, which could contribute to effective p-doping. Moreover, through incorporating EDOT to construct random copolymers, it can also induce an orientation change from face-on dominated to edge-on dominated orientation as well as enhance the packing of copolymer chains, which is beneficial to the charge transport. Under same doping condition, the electrical conductivities of the doped polymers increase and the Seebeck coefficient decrease as the increasing of EDOT content, resulting in an optimized power factor of 6.4 μW m À1 K À2 for the random polymer with EDOT content of 40% which is four times higher than that of alternating conjugated copolymer PDPP-3T.These results demonstrated that constructing random copolymers by incorporating more electronic donors into D-A conjugated polymers may be a promising strategy for developing TE conjugated polymers.

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Effect of backbone structure on the thermoelectric performance of indacenodithiophene-based conjugated polymers

Cited by 10 publications

References 51 publications

Structure and Doping Optimization of IDT-Based Copolymers for Thermoelectrics

Structure and Doping Optimization of IDT-Based Copolymers for Thermoelectrics

Low Interfacial Energy Barrier and Improved Thermoelectric Performance in Te-Incorporated Polypyrrole

Enhancement of thermoelectric properties of D‐A conjugated polymer through constructing random copolymers with more electronic donors

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