G - Physics – 11 – C
Patent
G - Physics
11
C
352/82.22, 352/8
G11C 11/40 (2006.01) G11C 11/404 (2006.01) H01L 27/108 (2006.01) H01L 27/12 (2006.01) H01L 29/10 (2006.01) H01L 29/423 (2006.01) H01L 29/94 (2006.01)
Patent
CA 1087309
ABSTRACT OF THE DISCLOSURE 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 an- other 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 cap- acitor or at least one of the MIS capacitors, and which contains a material having a crystal diode effect at the contact points with the substrate 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 sur- face 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 re- spect to location in such a way that, by the way of applying an electrode volt- age, which may be given within a wide range between the substrate terminal and electrode, the local distribution of the amounts of the potential maximum be- tween the range or within the ranges of the MIS capacitor or capacitors, com- prises, laterally away from the contact area beginning at the side of the con- tact area, at least one increase from a minimum value to a maximum value.
262328
Knauer Karl
Pfleiderer Hans-Jorg
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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