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, 2004
Filed:
Jun. 26, 1998
Gary B. Bronner, Stormville, NY (US);
David V. Horak, Essex Junction, VT (US);
Toshiharu Furukawa, Essex Junction, VT (US);
Jack A Mandelman, Stormville, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
The preferred embodiment of the present invention provides unique structure for connecting between a storage capacitor and a transfer device in a memory cell and a method for fabricating the same. The preferred embodiment of the present invention forms a capacitor structure having a “lip” at its top on the side the connection is to be made. To form the connection, dopant is diffused from the lower surface of the capacitor step and into the substrate, forming a surface strap to connect between the storage capacitor and the transfer device. This surface strap has the advantage of being self aligned with the storage capacitor and the transfer device, facilitating higher memory cell densities. The present invention can be used to form connections between storage capacitors and memory cells in a wide variety of devices.