Tuning of electronic properties of novel donor–acceptor polymers containing oligothiophenes with electron-withdrawing ester groups

Imae, Ichiro; Tada, Naofumi; Harima, Yutaka

doi:10.1007/s00289-020-03212-5

Cited by 7 publications

(1 citation statement)

References 43 publications

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“…47 I. Imae et al reported that introduction of alkoxy groups could enhance the electron-donating nature of D-A polymers and reduce their oxidation potentials. [48][49][50][51] Here, in our work, with incorporating more electron rich 3,4-EDOT units, the onset oxidation potentials of the random copolymers reduced and the corresponding HOMO level of the random copolymers rised from À5.20, À5.07 to À4.95 eV for PDPP-EDOT-20, PDPP-EDOT-40 and PDPP-EDOT-50, respectively. The reduction peak for these polymers were decreased to lower potential as the content of EDOT units increased in the polymers.…”

Section: Electrochemical Propertiesmentioning

confidence: 59%

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of the random copolymers are increased as part of the electron deficiency acceptor DPP units in the polymer chain were superseded by electron rich EDOT, which could contribute to effective p-doping.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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