Cell Dynamics Simulations of Sphere-Forming Diblock Copolymers in Thin Films on Chemically Patterned Substrates

The morphology of sphere-forming
block copolymers assembled in
thin films on patterned surfaces is theoretically analyzed. The patterns
on the lower surface are alternating bands of a given width distinctively
attracting or repelling a given block. We find that long-range order
can be achieved, and it depends on the commensurability of the characteristic
length of the block domains with both band periodicity and slit thickness.
The comparison of the simulation results with experimental data shows
a very good agreement. Furthermore, we show that the proper selection
of the band periodicity and, consequently, of the film thickness permits
the system to switch from hexagonal packing to body-centered orthohedra.
Therefore, we show that it exists a way to control the formation of
long-range ordered structures of different types in this kind of system.