Patent ID: 7160670

Claim:
A method for forming a structure for aligning an electron beam or an ion beam when exposing a wafer, the method which comprises: preparing a resist material including: a polymer including anhydride groups and at least one acid-sensitive group selected from a group consisting of a tert.-butylester group, a tert.-butoxycarbonyloxy group, a tetrahydrofuranyl group, and a tetrahydropyranyl group; a photoreactive compound releasing an acid upon irradiation with UV light, electrons, or ions; a solvent; and at least one scintillating substance; depositing the resist material on the wafer, thereby forming a first resist on the wafer; desiccating the first resist; irradiating a portion of the first resist for forming the structure in the first resist and thereby photolytically forming an acid in the irradiated portion of the first resist; baking the first resist to break down the acid-sensitive group in the polymer using the acid that was formed in the irradiated portion of the first resist; developing the first resist by removing separated polymer components in the irradiated portion for forming the structure in the first resist; silylating the structure in the first resist; depositing a second resist on the first resist, the second resist covering the structure formed in the first resist containing the at least one scintillating substance; and irradiating the second resist with an electron beam or an ion beam such that an amount of energy is absorbed by the scintillating substance in the first resist and emitted at a different wavelength thereby indicating a position of the electron beam or ion beam on the wafer.