Patent ID: 7501304
Filing Date: 2009-03-10
Classification: H01L

Abstract:
1. A method of cleaning a cover glass having a spacer which is to be incorporated in a solid image pickup device, comprising: performing a dry cleaning step after dry etching, the dry cleaning step being a step in which an etching mask on the spacer after the dry etching and an adhesive exposed to the glass substrate are removed by performing ashing by an oxygen plasma; performing a wipe-off cleaning step after the dry cleaning step, the wipe-off cleaning step being a step in which foreign substances adhering to an outer surface side of the cover glass having a spacer where no spacer is formed is removed by being wiped off by use of an organic solvent; performing a primary wet cleaning step after the wipe-off cleaning step, the primary wet cleaning step being a step of APM cleaning in which dry etching residues and environmental foreign substances which cannot be removed by the ashing by an oxygen plasma are caused to float up from the glass substrate by use of an APM cleaning liquid; and performing a secondary wet cleaning step after the primary wet cleaning step, the secondary wet cleaning step being a step of removing foreign substances by pure-water ultrasonic cleaning, wherein the cover glass having a spacer is fabricated by a manufacturing process including the steps of: bonding a spacer substrate to a glass substrate with an adhesive; applying a photoresist to the spacer substrate; exposing and developing the photoresist by use of a photomask and forming an etching mask corresponding to the spacer on the spacer substrate; and forming a spacer on the glass substrate by the dry etching the spacer substrate.