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Backbone Effects on the Thermoelectric Properties of Ultra-Small Bandgap Conjugated Polymers.

ABSTRACT: Conjugated polymers with narrower bandgaps usually induce higher carrier mobility, which is vital for the improved thermoelectric performance of polymeric materials. Herein, two indacenodithiophene (IDT) based donor-acceptor (D-A) conjugated polymers (PIDT-BBT and PIDTT-BBT) were designed and synthesized, both of which exhibited low-bandgaps. PIDTT-BBT showed a more planar backbone and carrier mobility that was two orders of magnitude higher (2.74 × 10-2 cm2V-1s-1) than that of PIDT-BBT (4.52 × 10-4 cm2V-1s-1). Both exhibited excellent thermoelectric performance after doping with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane, where PIDTT-BBT exhibited a larger conductivity (0.181 S cm-1) and a higher power factor (1.861 μW m-1 K-2) due to its higher carrier mobility. The maximum power factor of PIDTT-BBT reached 4.04 μW m-1 K-2 at 382 K. It is believed that conjugated polymers with a low bandgap are promising in the field of organic thermoelectric materials.

SUBMITTER: Xie D 

PROVIDER: S-EPMC8347066 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature

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Backbone Effects on the Thermoelectric Properties of Ultra-Small Bandgap Conjugated Polymers.

Xie Dexun D   Xiao Jing J   Li Quanwei Q   Liu Tongchao T   Xu Jinjia J   Shao Guang G  

Polymers 20210728 15

Conjugated polymers with narrower bandgaps usually induce higher carrier mobility, which is vital for the improved thermoelectric performance of polymeric materials. Herein, two indacenodithiophene (IDT) based donor-acceptor (D-A) conjugated polymers (PIDT-BBT and PIDTT-BBT) were designed and synthesized, both of which exhibited low-bandgaps. PIDTT-BBT showed a more planar backbone and carrier mobility that was two orders of magnitude higher (2.74 × 10<sup>-2</sup> cm<sup>2</sup>V<sup>-1</sup>s<  ...[more]