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US 10,763,431 B2Granted
Film stress control for memory device stack
AssigneeInternational Business Machines Corporation
InventorsInjo Ok, Choonghyun Lee, Chih-Chao Yang, Seyoung Kim, Soon-Cheon Seo
Life of this patent
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Abstract
Semiconductor structures are provided that include a memory device buried within interconnect dielectric materials and in which a combination of a compressive metal-containing layer and a tensile metal-containing layer have been used to minimize wafer bow and litho overlay shift as well as a method of forming such semiconductor structures.
Claims17
A semiconductor structure comprising:
- a bottom electrode located on a surface of a first electrically conductive structure, wherein the first electrically conductive structure is embedded in a first interconnect dielectric material layer;
- a memory device pillar located on a surface of the bottom electrode, wherein the memory device pillar is a ferroelectric memory (FE) device pillar, a resistive random access memory (ReRAM) device pillar, a magnetoresistive random access memory (MRAM) device pillar, or a phase change random access memory (PRAM) device pillar;
- and
- a top electrode located on the memory device pillar, wherein the top electrode includes a compressive metal-containing portion in direct physical contact with the memory device pillar, and a tensile metal-containing portion located directly on the compressive metal-containing portion.
1 more element
A semiconductor structure comprising:
- a bottom electrode located on a surface of a first electrically conductive structure, wherein the first electrically conductive structure is embedded in a first interconnect dielectric material layer;
- a first compressive metal-containing portion located above the bottom electrode;
- a memory device pillar located on a surface of the first compressive metal-containing portion, wherein the memory device pillar is a ferroelectric memory (FE) device pillar, a resistive random access memory (ReRAM) device pillar, a magnetoresistive random access memory (MRAM) device pillar, or a phase change random access memory (PRAM) device pillar;
- and
- a top electrode composed of a first tensile metal-containing portion located on the memory device pillar.
2 more elements
A method of reducing wafer bowing in a semiconductor structure, the method comprising:
- forming a bottom electrode located on a surface of a first electrically conductive structure, wherein the first electrically conductive structure is embedded in a first interconnect dielectric material layer;
- forming a memory device stack above the bottom electrode and on a topmost surface of the first interconnect dielectric material layer, wherein a first compressive metal-containing layer contacts one surface of the memory device stack and the memory device stack is a ferroelectric memory (FE) device stack, a resistive random access memory (ReRAM) device stack, a magnetoresistive random access memory (MRAM) device stack, or a phase change random access memory (PRAM) device stack;
- and
- forming a first tensile metal-containing layer above the memory device stack, wherein the first tensile metal-containing layer compensates the compressive stress caused by the first compressive metal-containing layer.
1 more element
Dependencies are inferred from the claim text.