Work

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

Year: 2021

Type: article

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.

Source: Polymers

DOI: 10.3390/polym13152486

Authors: Dexun Xie, Jing Xiao, Quanwei Li, Tongchao Liu, Jinjia Xu, Guang Shao

Institutions: Sun Yat-sen University, Shenzhen University, Purdue University West Lafayette

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,376

Funders: Fundamental Research Funds for the Central Universities, Basic and Applied Basic Research Foundation of Guangdong Province