Information memory for storing information in the form of electr

Details Information memory for storing information in the form of electr Information memory for storing information in the form of electr

1976-09-15

1977-12-20

Hecker, Stuart N.

Static information storage and retrieval

Systems using particular element

Capacitors

307303, 357 51, 365174, G11C 1124

Patent

active

040644910

ABSTRACT:
An information memory for storing information in the form of electric charge carriers has at least one dynamic storage element which is arranged upon a surface of at least one substrate made of semiconductor material and doped with a given basic type doping. The substrate connection is included and the memory comprises at least one MIS capacitor. Upon the substrate surface at least one electrically insulating layer is present which carries at least one capacitor electrode. The dynamic storage element comprises the MIS capacitor or an adjacent arrangement of several MIS capacitors, separated from one another by, at the most, narrow distances and comprises at least one contact area at the substrate surface which is provided with an externally accessible ohmic terminal contact, and which contacts at least the margin of the MIS capacitor or t least one of the MIS capacitors, nd which contains material having the basic type of doping. Within the electrically insulating layer, within the MIS capacitor or capacitors, the values of the numerical ratio .epsilon./d--whereby .epsilon. is the dielectric constant and d is the layer thickness of the electrically insulating layer--and/or the values of the surface density of the basic type of doping of the substrate in the area or in the areas of the MIS capacitor or capacitors and/or the values of the surface density, with respect to the surface of the substrate, of and adjacent to the substrate and doped opposite to the type of doping of the substrate layer, are selected differently with respect to location in such a way that, by the way of applying an electrode voltage, which may be given within a wide range between the substrate terminal and electrode, the local distribution of the amounts of the potential maximum between the range or within the ranges of the MIS capacitor or capacitor, comprises, laterally away from the contact area beginning at the side of the contact area, at least one increase from a minimum value to a maximum value.

REFERENCES:
terman, Small Area Stored Charge Memory Cells, Sept. 1972, IBM Technical Disclosure Bulletin, vol. 15, No. 4, pp. 1227-1229.
Sodini, et al., Enhanced Capacitor for One-Transistor Memory Cell, IEEE Transactions on Electron Devices, Oct. 1976, pp. 1187-1189.

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