REDUCED RESIDUAL FORMATION IN ETCHED MULTI-LAYER STACKS
A multi-layer stack for imprint lithography is formed by applying a first polymerizable composition to a substrate, polymerizing the first polymerizable composition to form a first polymerized layer, applying a second polymerizable composition to the first polymerized layer, and polymerizing the second polymerizable composition to form a second polymerized layer on the first polymerized layer. The first polymerizable composition includes a polymerizable component with a glass transition temperature less than about 25° C., and the first polymerized layer is substantially impermeable to the second polymerizable composition.
1 . A multi-layer stack for imprint lithography, formed by a method comprising:
(i) applying a first polymerizable composition to a substrate;
(ii) polymerizing the first polymerizable composition to form a first polymerized layer;
(iii) applying a second polymerizable composition to the first polymerized layer; and
(iv) polymerizing the second polymerizable composition to form a second polymerized layer on the first polymerized layer, wherein
the first polymerized layer is substantially impermeable to the silicon-containing polymerizable composition.
2 . The multi-layer stack of claim 1 , wherein the method further comprises etchback and transfer etching of the multi-layer stack.
3 . The multi-layer stack of claim 2 , wherein transfer etching of the multi-layer stack forms recesses substantially free of residue.
4 . The multi-layer stack of claim 1 , wherein the first polymerizable composition is substantially free from silicon.
5 . The multi-layer stack of claim 1 , wherein the first polymerizable composition comprises a mono-functional polymerizable component and a multi-functional polymerizable component, and the relative reactivity of the mono-functional component and the multi-functional component allow substantially complete polymerization of the first polymerizable composition.
6 . A polymerizable composition for imprint lithography, comprising:
a mono-functional polymerizable component;
a multi-functional polymerizable component; and
a photoinitiator, wherein
the composition is polymerizable to form a solidified layer substantially impermeable to a silicon-containing polymerizable composition.
7 . The polymerizable composition of claim 6 , wherein substantially impermeable comprises the substantial absence of silicon-containing residue formation in a multi-layer imprint lithography etching process.
8 . The polymerizable composition of claim 6 , wherein the mono-functional polymerizable component has a glass transition temperature less than about 0° C.
9 . The polymerizable composition of claim 6 , wherein the mono-functional polymerizable component comprises (2-ethyl-2-methyl-1,3-dioxolan-4-yl)methyl acrylate.
10 . The polymerizable composition of claim 6 , wherein the multi-functional polymerizable component comprises neopentyl glycol diacrylate.
11 . The polymerizable composition of claim 6 , wherein the first polymerizable composition is substantially free from silicon.