Patent ID: 9543159
Date: 2017-01-10
CPC Classifications: G03F,H01L

Claim:
1. A lithography method, comprising: forming an under layer of a polymeric material on a substrate; forming a silicon-containing middle layer on the under layer, wherein the silicon-containing middle layer includes a polymer chain having a first segment having an O—Si—O bond structure, a second segment having an O—Si—O bond structure, and a third segment having an O—Si—O bond structure, wherein the first segment is connected to the second segment by a first acid-cleavable group and the second segment is connected to the third segment by a second acid-cleavable group; forming a patterned photosensitive layer on the silicon-containing middle layer; performing a first etching process to transfer a pattern on of the patterned photosensitive layer to the silicon-containing middle layer; performing a second etching process to transfer the pattern to the under layer); and performing a wet stripping process to the silicon-containing middle layer and the under layer.