Self-Aligned RRAM Fabrication via PCMO Sputtering

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Solution Overview

Problem

Existing memory technologies, such as DRAM, are volatile and require power to maintain data, whereas non-volatile alternatives like RRAM and MRAM face challenges in achieving high density and low-cost manufacturing with complex fabrication processes.

Innovation Solution

The formation of self-aligned resistive random access memory (RRAM) and magnetic random access memory (MRAM) cells using a Pr1-XCaXMnO3 (PCMO) layer, deposited above a metal electrode layer with an insulator, simplifies the manufacturing process by eliminating the need for etching and allows for smaller geometry and low-temperature processing, enabling high-density solid-state memory devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If complex fabrication processes are used for RRAM and MRAM, then manufacturing precision can be improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvememory cell fabrication precisionVSAvoidfabrication process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The fabrication process is segmented into distinct functional layers (insulator layer, PCMO layer, metal electrode layers) that can be independently deposited and patterned. This segmentation allows each layer to be optimized separately while simplifying the overall manufacturing process by avoiding complex multi-step etching sequences.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The insulator layer is deposited and patterned in advance before the PCMO layer is applied. This preliminary action creates a pre-defined template that guides subsequent material deposition, eliminating the need for complex in-situ patterning and reducing the number of fabrication steps required.

Inventive Principle:

Principle #10Preliminary action

2Quantity of substance

If high-density memory structures are implemented, then storage capacity increases, but manufacturing complexity and cost increase

Engineering Contradiction:

Improvememory densityVSAvoidmanufacturing complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The memory structure transitions from planar two-dimensional arrangements to three-dimensional vertical stacking with the PCMO layer positioned between metal electrode layers. This dimensional change enables higher storage density by utilizing the vertical space efficiently while maintaining compatibility with standard deposition processes.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The memory cell employs a composite structure combining insulator materials, PCMO (Pr1-XCaXMnO3) functional layers, and metal electrodes. This composite approach achieves high-density storage through the synergistic properties of different materials while simplifying manufacturing by depositing each material layer separately using standard techniques.

Inventive Principle:

Principle #40Composite materials

3Adaptability or versatility

If low-temperature processing is used, then integration with existing semiconductor devices is improved, but manufacturing precision may deteriorate

Engineering Contradiction:

Improveintegration compatibilityVSAvoiddeposition precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The deposition process operates at reduced temperatures compared to traditional high-temperature semiconductor manufacturing. This parameter change enables integration with previously deposited sensitive elements that cannot withstand high temperatures, while the precision is maintained through controlled deposition conditions and material selection.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Traditional high-temperature thermal processing is replaced with low-temperature deposition techniques. This substitution allows the formation of memory structures without subjecting existing semiconductor devices to damaging temperatures, enabling seamless integration while maintaining manufacturing precision through controlled deposition parameters.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach results in a low-cost, high-density solid-state memory device with non-volatile characteristics, maintaining data without power and allowing for integration with existing semiconductor devices without damaging previously deposited elements, while reducing manufacturing complexity and temperature requirements.

Implementation Method 1

depositing a Pr1-XCaXMnO3 (PCMO) layer, in an electrically biased sputtering chamber, above the insulator and the metal portions

Methodology Applied

Scientific EffectSputtering: Sputtering

Data Source

PatentUS9711714B2Systems and methods for fabricating self-aligned resistive/magnetic memory cell

Publication Date: 2017.07.18 4D S

AI summary

Systems and methods are disclosed to form a resistive random access memory (RRAM) by forming a first metal electrode layer; depositing an insulator above the metal electrode layer and etching the insulator to expose one or more metal portions; depositing a Pr1-XCaXMnO3 (PCMO) layer, in an electrically biased sputtering chamber, above the insulator and the metal portions, to form one or more self-aligned RRAM cells above the first metal electrode; and depositing a second metal electrode layer above the PCMO layer.