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:
Dec. 19, 1989
Filed:
Feb. 10, 1986
Applicant:
Inventor:
Albert Bergemont, Treis, FR;
Assignee:
Eurotechnique, Rousset, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ; G11C / ; G11C / ;
U.S. Cl.
CPC ...
357 236 ; 357 45 ; 357 41 ; 365174 ;
Abstract
In a dynamic memory for capacitive data storage, enhanced storage performances are achieved by increasing the value of the storage capacitance. A junction capacitor is formed between the source region and the well region in which the memory cells are formed, the junction capacitor being associated with a conventional capacitor. By judiciously and heavily doping the wells, the junction capacitances are appreciably increased. The heavy-doping operation is performed by backward implantation of the wells at very high energy in order to place the concentration peak of the wells at the depth of the base of the thick oxides which form separations between memory cells.