Proceedings of nanoGe Fall Meeting 2021 (NFM21)
Publication date: 23rd September 2021
Organic thermoelectrics have the potential to directly convert waste heat into electrical power without the need of moving parts. In recent years, ethylene-glycol (EG) side-chain engineering in organic semiconductors has gradually become an efficient approach to boost the performance of organic thermoelectrics. The adoption of EG side-chains into organic semiconductors enables good host-dopant miscibility which benefits molecular doping. Although this strategy is widely utilized, the impact of side-chains is still little understood.
Here we show an in-depth study on the relationships between the density and type of EG side-chains, molecular packing and thermoelectric performance of NDI-based co-polymers doped with N-DMBI. We find that increasing the number of EG units via branching rather than lengthening the side-chains results in poor TE performance. In contrast, linear side-chains lead to improved molecular packing and thermoelectric performance. This investigation provides a unique insight into the understanding of molecular packing and sheds light on the rational design of efficient n-type organic semiconductors.
X.Y. and G.Y. contributed eqally to this work. X.Y. greatly acknowledge the China Scholarship Council. The authors thank Jacopo Pinna, Zernike Institute for Advanced Materials, University of Groningen for 2D GIWAX analysis.
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