Patent ID: 7407739

Claim:
A resist pattern formation method, comprising: forming a resist layer from a chemically amplified positive resist; exposing said resist layer disposed on a substrate; and developing said resist layer using an aqueous alkyl ammonium hydroxide solution having a concentration of ammonium hydroxide of 2.35 to 2.5 wt %, said alkyl ammonium hydroxide represented by a general formula (I) shown below: R 1 n R 2 4-n N + .OH − (I) wherein R 1 is a lower alkyl group in which a number of carbon atoms is A, R 2 is a lower alkyl group in which a number of carbon atoms is B, A<B, and n is an integer from 1 to 3; and wherein said chemically amplified positive resist comprises a resin with chain type alkoxyalkyl groups as acid dissociable, dissolution inhibiting groups as a base resin, and an acid generator.