The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 13, 1993
Filed:
Oct. 19, 1990
Takio Tamaki, Urawa, JP;
Sanjeev R Chitre, San Jose, CA (US);
Integrated Process Equipment Corporation, San Jose, CA (US);
Abstract
A system and process for removing a layer of a defined composition from a semiconductor wafer by performing at least one dry layer removal operation and at least one wet removal operation. A dry removal unit and a wet removal unit are disposed adjacent one another and robot mechanisms are provided to automatically transfer one wafer at a time through each unit in turn. The robot mechanisms are constructed to contact each wafer substantially at its edge in order to assure uniform treatment of both major surfaces of the wafer. For stripping a resist layer from a wafer, the dry stripping operation can be performed first to remove a portion of the layer, after which the remainder of the layer is removed by the wet stripping operation. At the end of the wet stripping operation, the wafer is rinsed in water and used rinse water is monitored to determine at least one of its resistivity and total organic content in order to produce an indication that removal of undesired materials from the wafer surfaces has been completed. Subsequent to the wet treatment, the wafer is subjected to a cleaning with an aqueous mist on which ultrasonic vibrations are imposed.