Non-volatile memory arrays comprising rail stacks with a shared diode component portion for diodes of electrically isolated pillars
First Claim
1. A non-volatile semiconductor memory, comprising:
- a substrate;
a plurality of substantially parallel and substantially coplanar first conductors at a first height above the substrate, the first conductors elongated in a first direction;
a plurality of substantially parallel and substantially coplanar rail stacks at a second height above the substrate, the rail stacks elongated in a second direction substantially orthogonal to the first direction, each rail stack including a second conductor and a first portion of a first diode component for a plurality of diodes associated with the rail stack; and
a plurality of pillars formed between intersections of the plurality of first conductors and the plurality of rail stacks, the plurality of pillars including a first set of pillars formed at the intersection of a first rail stack and the plurality of first conductors, the first set of pillars each including a second portion of the first diode component for the plurality of diodes associated with the first rail stack, a second diode component and a state change element, the second diode component comprising heavily doped polysilicon of a first conductivity type, the first portion of the first diode component and the second portion of the first diode component comprising lightly doped polysilicon of a second conductivity type that is opposite to the first conductivity type.
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Accused Products
Abstract
An integrated circuit including vertically oriented diode structures between conductors and methods of fabricating the same are provided. Two-terminal devices such as passive element memory cells can include a diode steering element in series with an antifuse and/or other state change element. The devices are formed using pillar structures at the intersections of upper and lower sets of conductors. The height of the pillar structures are reduced by forming part of the diode for each pillar in a rail stack with one of the conductors. A diode in one embodiment can include a first diode component of a first conductivity type and a second diode component of a second conductivity type. A portion of one of the diode components is divided into first and second portions with one on the portions being formed in the rail stack where it is shared with other diodes formed using pillars at the rail stack.
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Citations
18 Claims
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1. A non-volatile semiconductor memory, comprising:
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a substrate; a plurality of substantially parallel and substantially coplanar first conductors at a first height above the substrate, the first conductors elongated in a first direction; a plurality of substantially parallel and substantially coplanar rail stacks at a second height above the substrate, the rail stacks elongated in a second direction substantially orthogonal to the first direction, each rail stack including a second conductor and a first portion of a first diode component for a plurality of diodes associated with the rail stack; and a plurality of pillars formed between intersections of the plurality of first conductors and the plurality of rail stacks, the plurality of pillars including a first set of pillars formed at the intersection of a first rail stack and the plurality of first conductors, the first set of pillars each including a second portion of the first diode component for the plurality of diodes associated with the first rail stack, a second diode component and a state change element, the second diode component comprising heavily doped polysilicon of a first conductivity type, the first portion of the first diode component and the second portion of the first diode component comprising lightly doped polysilicon of a second conductivity type that is opposite to the first conductivity type. - View Dependent Claims (2, 3)
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4. A method of fabricating an integrated circuit device, comprising:
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forming a plurality of substantially parallel and substantially coplanar first conductors at a first height above a substrate, the first conductors elongated in a first direction; forming a plurality of substantially parallel and substantially coplanar rail stacks at a second height above the substrate, the rail stacks elongated in a second direction substantially orthogonal to the first direction, each rail stack including a second conductor and a first portion of a first diode component for a plurality of diodes associated with the rail stack; and forming a plurality of pillars between intersections of the plurality of first conductors and the plurality of rail stacks, the plurality of pillars including a first set of pillars formed at the intersection of a first rail stack and the plurality of first conductors, the first set of pillars each including a second portion of the first diode component for the plurality of diodes associated with the first rail stack, a second diode component and a state change element, the second diode component comprising heavily doped polysilicon of a first conductivity type, the first portion of the first diode component and the second portion of the first diode component comprising intrinsic polysilicon. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A non-volatile semiconductor memory, comprising:
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a substrate; a plurality of substantially parallel and substantially coplanar first conductors at a first height above the substrate, the first conductors elongated in a first direction; a plurality of substantially parallel and substantially coplanar rail stacks at a second height above the substrate, the rail stacks elongated in a second direction substantially orthogonal to the first direction, each rail stack including a second conductor and a first portion of a first diode component for a plurality of diodes associated with the rail stack; and a plurality of pillars formed between intersections of the plurality of first conductors and the plurality of rail stacks, the plurality of pillars including a first set of pillars formed at the intersection of a first rail stack and the plurality of first conductors, the first set of pillars each including a second portion of the first diode component for the plurality of diodes associated with the first rail stack, a second diode component and a state change element, the second diode component comprising heavily doped polysilicon of a first conductivity type, the first portion of the first diode component and the second portion of the first diode component comprising intrinsic polysilicon. - View Dependent Claims (11, 12)
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13. A method of fabricating an integrated circuit device, comprising:
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forming a plurality of substantially parallel and substantially coplanar first conductors at a first height above a substrate, the first conductors elongated in a first direction; forming a plurality of substantially parallel and substantially coplanar rail stacks at a second height above the substrate, the rail stacks elongated in a second direction substantially orthogonal to the first direction, each rail stack including a second conductor and a first portion of a first diode component for a plurality of diodes associated with the rail stack; and forming a plurality of pillars between intersections of the plurality of first conductors and the plurality of rail stacks, the plurality of pillars including a first set of pillars formed at the intersection of a first rail stack and the plurality of first conductors, the first set of pillars each including a second portion of the first diode component for the plurality of diodes associated with the first rail stack, a second diode component and a state change element, the second diode component comprising heavily doped polysilicon of a first conductivity type, the first portion of the first diode component and the second portion of the first diode component comprising lightly doped polysilicon of a second conductivity type that is opposite to the first conductivity type. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification