US 2020/0091236 A1Published application

Semiconductor memory device

AssigneeToshiba Memory Corporation

InventorsAkira HOKAZONO, Hitoshi IWAI

Life of this patent

Estimating the term…

Loading patent…

Abstract

A semiconductor memory device includes a substrate, a plurality of first wirings arranged in a first direction, a second wiring extending in the first direction, a resistance change film provided between the first wiring and the second wiring, a third wiring which extends in the second direction, a first semiconductor layer connected to the second wiring and the third wiring, a first electrode, a fourth wiring connected to the second wiring, and extends in the third direction, a fifth wiring provided between the fourth wiring and the substrate, extending in the first direction, and connected to the fourth wiring, a sixth wiring provided between the fifth wiring and the substrate, a second semiconductor layer provided between the fifth wiring and the sixth wiring and connected to the fifth wiring and the sixth wiring, and a second electrode.

Claims19

Dependent claims

A semiconductor memory device comprising:

a substrate;
a plurality of first wirings arranged in a first direction intersecting with a surface of the substrate;
a second wiring extending in the first direction;
a resistance change film provided between the first wiring and the second wiring;
a third wiring which is closer to the substrate than the second wiring and extends in a second direction intersecting with the first direction;
a first semiconductor layer provided between the second wiring and the third wiring and connected to the second wiring and the third wiring;
a first electrode facing the first semiconductor layer;
a fourth wiring which is farther from the substrate than the second wiring, is connected to the second wiring, and extends in a third direction intersecting with the first direction;
a fifth wiring provided between the fourth wiring and the substrate, extending in the first direction, and connected to the fourth wiring;
a sixth wiring provided between the fifth wiring and the substrate;
a second semiconductor layer provided between the fifth wiring and the sixth wiring and connected to the fifth wiring and the sixth wiring;
and
a second electrode facing the second semiconductor layer.

10 more elements

A semiconductor memory device comprising:

a substrate;
a plurality of first wirings arranged in a first direction intersecting with a surface of the substrate and including a portion extending in a second direction intersecting with the first direction;
a plurality of second wirings arranged in the second direction and extending in the first direction;
a resistance change film provided between the portion of the first wiring extending in the second direction and the second wiring;
a plurality of third wirings which are closer to the substrate than the plurality of second wirings and are arranged in the second direction;
a plurality of first semiconductor layers provided between the plurality of second wirings and the plurality of third wirings, arranged in the second direction, and connected to the plurality of second wirings and the plurality of third wirings;
a first electrode extending in the second direction and facing the first semiconductor layer;
a plurality of fourth wirings which are farther from the substrate than the plurality of second wirings and arranged in the second direction;
a plurality of second semiconductor layers provided between the plurality of second wirings and the plurality of fourth wirings, arranged in the second direction, and connected to the plurality of second wirings and the plurality of fourth wirings;
a second electrode extending in the second direction and facing the second semiconductor layer;
and
a control circuit connected to the plurality of first wirings, the plurality of third wirings, and the plurality of fourth wirings;
wherein the control circuit is configured to apply a first operating voltage to at least one of the plurality of third wirings, and to apply a second operating voltage different from the first operating voltage to at least one other third wiring, and
to apply a third operating voltage to a fourth wiring of the plurality of fourth wirings corresponding to the third wiring to which the first operating voltage is applied, and to apply a fourth operating voltage different from the third operating voltage to a fourth wiring of the plurality of fourth wirings corresponding to the third wiring to which the second operating voltage is applied.

11 more elements

A semiconductor memory device comprising:

a substrate;
a plurality of first wirings arranged in a first direction intersecting with a surface of the substrate;
a plurality of second wirings arranged in a second direction intersecting with the first direction and extending in the first direction;
a resistance change film provided between the first wiring and the second wiring;
a third wiring which is closer to the substrate than the plurality of second wirings and extends in the second direction;
a plurality of first semiconductor layers provided between the plurality of second wirings and the third wiring and connected to the plurality of second wirings and the third wiring;
a plurality of first electrodes arranged in the second direction and facing the plurality of first semiconductor layers;
a plurality of second semiconductor layers electrically connected to the plurality of second wirings;
one or a plurality of fourth wirings connected to the plurality of second semiconductor layers;
a plurality of second electrodes facing the plurality of second semiconductor layers;
and
a control circuit connected to the plurality of first wirings, the third wiring, and the one or plurality of fourth wirings,
wherein the control circuit is configured such that, when a voltage to be transferred to one of the plurality of first wirings is set to a first write voltage, a voltage to be transferred to the plurality of other first wirings is set to a non-select voltage, a voltage to be transferred to one of the plurality of second wirings is set to a second write voltage, and the plurality of other second wirings are set in a floating state, and a non-select voltage when an absolute value of a difference between a voltage of the first wiring to which the first write voltage is transferred and a voltage of the second wiring to which the second write voltage is transferred becomes a maximum is set as a first voltage,
the control circuit applies a voltage that coincides with the first write voltage to at least one of the plurality of first wirings and
applies a voltage having a magnitude between the second write voltage and the first voltage to at least one of the plurality of first wirings.

12 more elements

Dependencies are inferred from the claim text.