Pyrazine-Flanked Diketropyrrolopyrrole (DPP): A New Polymer Building Block for High-Performance n-Type Organic Thermoelectrics
Document Type
Article
Publication Date
11-27-2019
School
Polymer Science and Engineering
Abstract
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.
Publication Title
Journal of the American Chemical Society
Volume
141
Issue
51
First Page
20215
Last Page
20221
Recommended Citation
Yan, X.,
Xiong, M.,
Li, J.,
Zhang, S.,
Ahmad, Z.,
Lu, Y.,
Wang, Z.,
Yao, Z.,
Wang, J.,
Gu, X.
(2019). Pyrazine-Flanked Diketropyrrolopyrrole (DPP): A New Polymer Building Block for High-Performance n-Type Organic Thermoelectrics. Journal of the American Chemical Society, 141(51), 20215-20221.
Available at: https://aquila.usm.edu/fac_pubs/16838