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Pyrazine-Flanked Diketopyrrolopyrrole (DPP): A New Polymer Building Block for High-Performance n-Type Organic Thermoelectrics
Open accessAbstract
n-Doped conjugated polymers usually show low electrical conductivities and low thermoelectric power factors, limiting their applications in n-type organic thermoelectrics. Here, we report the synthesis of a new diketopyrrolopyrrole (DPP) derivative, pyrazine-flanked DPP (PzDPP), with the deepest LUMO level in all the reported DPP derivatives. Based on PzDPP, a donor–acceptor copolymer, P(PzDPP-CT2), is synthesized. The polymer displays a deep LUMO energy level and strong interchain interaction with a short π–π stacking distance of 3.38 Å. When doped with n-dopant N -DMBI, P(PzDPP-CT2) exhibits high n-type electrical conductivities of up to 8.4 S cm –1 and power factors of up to 57.3 μW m –1 K –2 . These values are much higher than previously reported n-doped DPP polymers, and the power factor also ranks the highest in solution-processable n-doped conjugated polymers. These results suggest that PzDPP is a promising high-performance building block for n-type organic thermoelectrics and also highlight that, without sacrificing polymer interchain interactions, efficient n-doping can be realized in conjugated polymers with careful molecular engineering.
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Metadata
- Authors
- Yan, X., Xiong, M., Li, J.-T., Zhang, S., Chase, Z. A., Lu, Y., Wang, Z.-Y., Yao, Z.-F., Wang, J.-Y., Gu, X., & Lei, T.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-11-27
- Volume
- 141
- Issue
- 51
- Pages
- 20215-20221
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2990105054
- Cited by
- 268
- References
- 34
- FWCI
- 10.68
- Type
- journal article
- Language
- en
- Open access
- green
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