Patent ID: 7993816

Claim:
A method of patterning a surface comprising: providing a heterogeneous reflectivity surface; forming a block copolymer atop the heterogeneous reflectivity surface; segregating the block copolymer into first units and second units; applying a radiation to the first units and second units, wherein the heterogeneous reflectivity surface produces an exposed portion of the first units and the second units; applying a first development step to at least the exposed portion of the first units and the second units, the first development step removing a portion of the exposed portion of the second units to expose a portion of the heterogeneous reflectivity surface; applying an anneal to produce a spread film of first units on the portion of the heterogeneous reflectivity surface exposed by the first development step; and applying a second development step to remove at least one of a remaining developed second unit to provide a pattern including at least one void.