MOS dynamic ram
First Claim
1. A MOS dynamic RAM constructed by integrated memory cells each having a MOSFET and a MOS capacitor comprising:
- a semiconductor substrate of a first conductivity type in which recesses and projections are periodically formed;
a source region of a second conductivity type formed in an upper surface of each of said projections;
a drain region of the second conductivity type formed in a bottom portion of each of said projections;
a channel region of the first conductivity type sandwiched between said source and drain regions;
a gate insulating film formed on a side wall of each of said projections between said source and drain region;
a gate electrode formed on said gate insulating film, said MOSFET being constituted by said source, drain, and channel regions, said gate insulating film and said gate electrode;
a first insulating film formed on said source region;
a first electrode of said MOS capacitor formed on said first insulating film, said MOS capacitor being constituted by said source region, said first insulating film and said first electrode, said source region serving as a second electrode of said MOS capacitor, said gate electrode serving as a word line, and said first electrode of said MOS capacitor serving as a bit line.
1 Assignment
0 Petitions
Accused Products
Abstract
A MOS dynamic RAM consists of integrated memory cells each having a MOSFET and a MOS capacitor. The MOS dynamic RAM comprises a semiconductor substrate of a first conductivity type on which periodic projections and recesses are formed, a source region of a second conductivity type formed in the upper surface of each projection, a drain region of the second conductivity type formed in a bottom portion of each projection, a channel region of the first conductivity type sandwiched between the source and drain regions, a gate insulating film formed on a side wall of each projection between the source and drain regions, a gate electrode formed on the gate insulating film, a first insulating film formed on the source region, and a first electrode of the MOS capacitor formed on the first insulating film. The MOSFET is constituted by the source, drain and channel regions, the gate insulating film and the gate electrode. The MOS capacitor is constituted by the source region, the first insulating film and the first electrode, and the source region serves as the second electrode thereof. The gate electrodes serve as word lines, and the first electrodes of MOS capacitor serve as bit lines.
118 Citations
27 Claims
-
1. A MOS dynamic RAM constructed by integrated memory cells each having a MOSFET and a MOS capacitor comprising:
-
a semiconductor substrate of a first conductivity type in which recesses and projections are periodically formed; a source region of a second conductivity type formed in an upper surface of each of said projections; a drain region of the second conductivity type formed in a bottom portion of each of said projections; a channel region of the first conductivity type sandwiched between said source and drain regions; a gate insulating film formed on a side wall of each of said projections between said source and drain region; a gate electrode formed on said gate insulating film, said MOSFET being constituted by said source, drain, and channel regions, said gate insulating film and said gate electrode; a first insulating film formed on said source region; a first electrode of said MOS capacitor formed on said first insulating film, said MOS capacitor being constituted by said source region, said first insulating film and said first electrode, said source region serving as a second electrode of said MOS capacitor, said gate electrode serving as a word line, and said first electrode of said MOS capacitor serving as a bit line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
Specification