Directed Self-Assembly of Block Copolymers Simulator

Assembly mode

Anneal

Parameters

Domain pitch 8 nm

Status

Mode

Undirected

Anneal

Dislocation defects

Long-range order

Why they differ: both films are the same diblock copolymer, phase-separating purely because A and B blocks repel each other. With no guide, each patch of film picks its own stripe orientation independently — where two patches meet, the stripes can't line up, so a dislocation forms. A lithographically pre-patterned chemical guide stripe underneath pins the phase everywhere at once, so the whole film registers to one template and no seams are left to mismatch.

Idle — press Start anneal

Block A Block B Guide stripe