Molecularly Aligned Hexa- peri-hexabenzocoronene Films by Brush-Coating and Their Application in Thin-Film Transistors

ACS Applied Materials & Interfaces
Fang-Ju LinYu-Tai Tao

Abstract

The facile Chinese brush-coating method was used to prepare oriented thin films of hexa- peri-hexabenzocoronene (HBC) derivatives on the silicon substrate. As a result of the directional solution-coating, the D3 h-symmetry (HBC-1,3,5-Ph-C12) and the C1-symmetry (HBC-1,2,4-Ph-C12) derivatives displayed an anisotropic alignment, with mostly edge-on orientation on SiO2 surfaces modified with various silane-based monolayers. On these silane-modified surfaces, the higher symmetry molecule HBC-1,3,5-Ph-C12 developed a hexagonally packed superstructure, which provided greater π orbital overlap and presumably the electronic coupling between neighboring molecules. In particular, the use of an octyltrichlorosilane (OTS)-modified surface enabled brush-coated thin films to have higher anisotropic orientation, crystallinity, and favorable molecular arrangement. In contrast, the growth of the hexagonal packing of low-symmetry derivative HBC-1,2,4-Ph-C12 was only achieved on the phenyltrichlorosilane and OTS surfaces. Thin-film transistors based on these brush-coated films gave a maximum mobility of 0.1 and 0.056 cm2 V-1 s-1, which are 2 orders of magnitude improvement over the devices with unoriented films prepared by spin-coating. The resul...Continue Reading

References

Jun 15, 2007·Angewandte Chemie·Sabine LaschatMartin Tosoni
May 14, 2011·The Journal of Physical Chemistry. B·Hyo-Sik KimSung-Min Choi
Oct 21, 2015·Advanced Materials·Sam SchottHenning Sirringhaus
Oct 3, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Fengjiao ZhangYing Diao
Nov 8, 2017·Proceedings of the National Academy of Sciences of the United States of America·Gang WangTobin J Marks
Feb 7, 2018·ACS Applied Materials & Interfaces·Ana Pérez-RodríguezEsther Barrena

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Citations

Oct 7, 2020·Chemical Communications : Chem Comm·Yafei DingLongzhen Qiu
Jan 21, 2021·International Journal of Molecular Sciences·Roberto Termine, Attilio Golemme
Feb 11, 2020·Journal of Medicinal Chemistry·Jun DaiYuning Hong

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