TY  - JOUR
A1  - Kathrein, Christine C.
A1  - Bai, Wubin
A1  - Currivan-Incorvia, Jean Anne
A1  - Liontos, George
A1  - Ntetsikas, Konstantinos
A1  - Avgeropoulos, Apostolos
A1  - Böker, Alexander
A1  - Tsarkova, Larisa
A1  - Ross, Caroline A.
T1  - Combining Graphoepitaxy and Electric Fields toward Uniaxial Alignment of Solvent-Annealed Polystyrene-b-Poly(dimethylsiloxane) Block Copolymers
JF  - Chemistry of materials : a publication of the American Chemical Society
N2  - 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 mu 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.
Y1  - 2015
U6  - https://doi.org/10.1021/acs.chemmater.5b03354
SN  - 0897-4756
SN  - 1520-5002
VL  - 27
IS  - 19
SP  - 6890
EP  - 6898
PB  - American Chemical Society
CY  - Washington
ER  -