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:
Mar. 23, 1999
Filed:
Jun. 11, 1997
Min-Liang Chen, Hsinchu, TW;
Mosel Vitelic Inc., Hsinchu, TW;
Abstract
A method of fabricating the self-registered cylindrical capacitor of high density Dynamic Random Access Memory (DRAM) cells. A first polysilicon layer which is the storage node of the capacitor is deposited overlaying the entire silicon substrate surface. A dielectric layer is formed overlaying the first polysilicon layer. Then, the dielectric layer and the first polysilicon layer are polished by CMP to form the cylindrical shape capacitor storage nodes. The self-registered cylindrical polysilicon storage nodes are formed by CMP technique without using the extra mask as the conventional method would. The first polysilicon storage nodes are treated by hot phosphoric acid (H.sub.3 PO.sub.4) to form the rugged surface that can tremendously increase the surface area of the capacitor. Therefore, the cylindrical capacitor storage node of the DRAM capacitor of this method has much greater surface area so as to increase the capacitance value of the DRAM capacitor, that can achieve high packing density of the integrated circuit devices.