Combining Graphoepitaxy and Electric Fields toward Uniaxial Alignment of Solvent-Annealed Polystyrene鈥?i>b鈥揚oly(dimethylsiloxane) Block Copolymers
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- 作者：Christine C. Kathrein ; Wubin Bai ; Jean Anne Currivan-Incorvia ; George Liontos ; Konstantinos Ntetsikas ; Apostolos Avgeropoulos ; Alexander B枚ker ; Larisa Tsarkova ; Caroline A. Ross
- 刊名：Chemistry of Materials
- 出版年：2015
- 出版时间：October 13, 2015
- 年：2015
- 卷：27
- 期：19
- 页码：6890-6898
- 全文大小：495K
- ISSN：1520-5002
文摘
We report a combined directing effect of the simultaneously applied graphoepitaxy and electric field on the self-assembly of cylinder forming polystyrene-b-poly(dimethylsiloxane) block copolymer in thin films. A correlation length of up to 20 渭m of uniaxial ordered striped patterns is an order of magnitude greater than that produced by either graphoepitaxy or electric field alignment alone and is achieved at reduced annealing times. The angle between the electric field direction and the topographic guides as well as the dimensions of the trenches affected both the quality of the ordering and the direction of the orientation of cylindrical domains: parallel or perpendicular to the topographic features. We quantified the interplay between the electric field and the geometry of the topographic structures by constructing the phase diagram of microdomain orientation. This combined approach allows the fabrication of highly ordered block copolymer structures using macroscopically prepatterned photolithographic substrates.