Ji Xu, Thomas P. Russell and Antonio Checco Lattice Deformation and Domain Distortion in the Self-Assembly of Block Copolymer Thin Films on Chemical Patterns Small 9
Self-assembly of cylindrical microdomains confined within chemically patterned stripes is studied. For stripes with widths comparable to the period of the copolymer, L0, a transition from n to n+1 microdomain rows is observed when the stripe width is close to n±1/2 L0. In the case of 1D microdomain arrays confined within stripes ∼1.2 L0 to ∼2.0 L0-wide, the incommensurability between the copolymer period and stripe width results in an elongation of the microdomains perpendicular to the stripe. The lack of topography facilitates stress distribution across the film, thereby stabilizing lattice strains significantly larger than those observable under confinement within topographical patterns.
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