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Deqing Zhang1

1, Institute of Chemistry, Chinese Academy of Sciences, Beijing, , China

The semiconducting properties of conjugated molecular systems are determined by the intermolecular/interchain pi-pi interactions and ordered packing. But, more and more studies manifest that apart from the conjugated backbones the side alkyl chains can dictate the self-organization of the polymer owing to the need for the side chains to form low-energy, space-filling structures. In many cases, the attractive van der Waals interactions between the alkyl side chains can exert an important influence on the interchain packing and backbone conformation, and as a result the thin film microstructure and charge transporting are affected. In this presentation, I will introduce our recent explorations in this aspect, including conjugated D-A polymers with both branching and linear alkyl chains and these with functional groups such amino and urea. The results demonstrate that semiconducting performance of these conjugated polymers can be largely improved by varying the side chains, and side-chain engineering becomes a new strategy for development of high performance of organic/polymeric semiconductors.

References

Hewei Luo, Chenmin Yu, Zitong Liu, Guanxin Zhang, Hua Geng, Yuanping Yi, Katharina Broch, Yuanyuan Hu, Aditya Sadhanala, Lang Jiang, Penglin Qi, Zhengxu Cai, Henning Sirringhaus, Deqing Zhang, Sci. Adv., 2016, 2 (5), e1600076.
Jingjing Yao, Chenmin Yu, Zitong Liu, Hewei Luo, Yang Yang, Guanxin Zhang, Deqing Zhang, J. Am. Chem. Soc. 2016, 138 (1), 173−185.
Yang Yang, Guanxin Zhang, Hewei Luo, Jingjing Yao, Zitong Liu, Deqing Zhang, ACS Appl. Mater. Interfaces, 2016, 8 (6), 3635-3643.
Si-Fen Yang, Zi-Tong Liu, Zheng-Xu Cai, Matthew J. Dyson, Natalie Stingelin, Wei Chen, Hua-Jun Ju, Guan-Xin Zhang, De-Qing Zhang, Adv. Sci. 2017, 1700048.
Si-Fen Yang, Xiao Zhang, Peng-Lei Chen, Zi-Tong Liu, Jian-Wu Tian, Guan-Xin Zhang, De-Qing Zhang, Adv. Elec. Mater. 2017, DOI:10.1002/aelm.201700120.
Jing Ma, Zitong Liu, Zhijie Wang, Yizhou Yang, Guanxin Zhang, Xisha Zhang, Deqing Zhang, Mater. Chem. Frontiers, 2017, DOI: 10.1039/C7QM00307B

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