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. 27, 1993
Filed:
Feb. 14, 1991
Chih-Yuan Lu, Taipei, TW;
Hsiang-Ming Chou, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A method for forming a multilayer contact to a device region through an insulating layered structure is described. An opening is formed through the insulating layered structure to the device region. A barrier metal layer is deposited over the device region and the insulating layered structure both above and on the sides of the opening. An in situ doped polysilicon layer is deposited over the barrier metal layer. A thin layer of metal is deposited over the polysilicon layer. The remaining portion of the opening is filled and the thin layer of metal is covered with undoped polysilicon. The undoped polysilicon is etched until the thin metal film is reached to thereby leave the opening filled. An aluminium metallurgical layer is deposited thereover to complete the multilayer contact.