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Polymer-Assisted Single Crystal Engineering of Organic Semiconductors To Alter Electron Transport

Xu, Haixiao, Zhou, Yecheng, Zhang, Jing, Jin, Jianqun, Liu, Guangfeng, Li, Yongxin, Ganguly, Rakesh, Huang, Li, Xu, Wei, Zhu, Daoben, Huang, Wei, Zhang, Qichun
ACS applied materials & interfaces 2018 v.10 no.14 pp. 11837-11842
electron transfer, polymers, semiconductors
A new crystal phase of a naphthalenediimide derivative (α-DPNDI) has been prepared via a facial polymer-assisted method. The stacking pattern of DPNDI can be tailored from the known one-dimensional (1D) ribbon (β phase) to a novel two-dimensional (2D) plate (α phase) through the assistance from polymers. We believe that the presence of polymers during crystal growth is likely to weaken the direct π–π interactions and favor side-to-side C–H−π contacts. Furthermore, β phase architecture shows electron mobility higher than that of the α phase in the single-crystal-based OFET. Theoretical calculations not only confirm that β-DPNDI has an electron transport performance better than that of the α phase but also indicate that the α phase crystal displays 2D transport while the β phase possesses 1D transport. Our results clearly suggest that polymer-assisted crystal engineering should be a promising approach to alter the electronic properties of organic semiconductors.