Abstract
The design of a conjugated polymer backbone influences the charge transport and do** efficiency; however, the construction of the polymer backbone for maximized thermoelectric performance is still unclear. Herein, a novel synthesis of a donor-acceptor (D-A) conjugated polymer with an extended planar backbone, C6-ICPDPP, is reported for the investigation of the thermoelectric behavior. The C6-ICPDPP comprises a combination of fused heterocyclic compounds, both electron donor and acceptor groups, which show p-do** characteristics with FeCl3 owing to the excellent planarization. The C6-ICPDPP films are formed from two types of solvents with different boiling points, both of which are doped with FeCl3, showing good thermoelectric properties; however, the thin-film structure, dopant diffusion, and thickness of the C6-ICPDPP films were different between the two solvents. With an increase in the do** concentration of FeCl3, the polarity of the majority charge carriers changes from positive to negative, indicating that the C6-ICPDPP exhibits both p- and n-type electrical behaviors with FeCl3 do**. The optimized power factors are 1.32 µW/mK2 (p-type) and 0.410 µW/mK2 (n-type), respectively, which are consistent with the change in the polaronic features at the given FeCl3 do** concentration. This study provides a design strategy for D-A conjugated polymers with extended planarization and electrical behavior suitable for organic thermoelectrics.
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Acknowledgments
Taek Seong Lee and Su Bin Lee contributed equally to this study. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2016M1A2A2940911 and No. 2021R1A2C1011215). This was supported by Korea National University of Transportation Industry-Academy Cooperation Foundation in 2021.
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Experimental procedure for the synthesis and characterization of C6-ICPDPP. The materials are available via the Internet at http://www.springer.com/13233.
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Lee, T.S., Lee, S.B., Choi, DY. et al. Do** and Thermoelectric Behaviors of Donor-Acceptor Polymers with Extended Planar Backbone. Macromol. Res. 29, 887–894 (2021). https://doi.org/10.1007/s13233-021-9099-z
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DOI: https://doi.org/10.1007/s13233-021-9099-z