Non-Volatile Resistive Oxide Memory Array Fabrication
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Solution Overview
Problem
The exposure of metal oxide materials to plasma etching during the fabrication of non-volatile resistive oxide memory cells can lead to unpredictable modifications in their composition and structure, affecting the operation of the memory cells.
Innovation Solution
A method of forming non-volatile resistive oxide memory arrays that avoids exposing the metal oxide material to etching plasma, instead using self-assembled block copolymer lines to create conductive word or bit lines, which are then processed to form individually programmable junctions without plasma etching, thereby maintaining the integrity of the metal oxide material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If plasma etching is used to pattern metal oxide materials during fabrication, then manufacturing precision is improved, but the composition and structure of metal oxide material are unpredictably modified
Solution Approach 1:
The patent extracts the harmful plasma etching process from the fabrication sequence by using alternative patterning methods such as self-assembled block copolymer lines and selective deposition techniques. This removes the source of composition modification while preserving the ability to achieve precise patterns through non-plasma-based approaches.
Solution Approach 2:
The patent introduces intermediary materials and processes between the patterning step and the metal oxide material. Specifically, self-assembled block copolymer lines serve as intermediaries to define patterns, and selective deposition processes act as intermediaries to transfer patterns without direct plasma contact to the metal oxide, thereby protecting its composition.
2Ease of manufacture
If plasma etching is applied to metal oxide material, then ease of manufacture is improved, but reliability of memory cell operation deteriorates
Solution Approach 1:
The patent replaces the plasma etching mechanism with alternative fabrication mechanisms such as self-assembly of block copolymers and selective chemical deposition. These substituted methods achieve patterning through different physical and chemical principles that do not involve plasma, thereby maintaining ease of manufacture while preserving metal oxide integrity for reliable operation.
3Manufacturing precision
If multiple masking and etching steps are used to pattern memory cell regions, then manufacturing precision is improved, but the metal oxide material is exposed to harmful plasma effects
Solution Approach 1:
The patent extracts the plasma exposure step from the multi-step patterning process by replacing plasma etching with non-plasma-based patterning techniques. This eliminates the harmful factor while maintaining the precision benefits through alternative methods such as self-assembled templates and selective deposition.
Solution Approach 2:
The patent introduces intermediary patterning layers and self-assembled structures that act as mediators between the patterning process and the metal oxide material. These intermediaries absorb or redirect the patterning action away from direct plasma contact with the metal oxide, thereby protecting it from harmful effects while achieving the desired precision.
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 ensures the persistence of the metal oxide material's resistive states and prevents unwanted modifications, enhancing the reliability and stability of the memory cells by eliminating the adverse effects of plasma etching.
Implementation Method 1
using self-assembled block copolymer lines to create conductive word or bit lines
Data Source
AI summary
A method of forming a non-volatile resistive oxide memory array includes forming a plurality of one of conductive word lines or conductive bit lines over a substrate. Metal oxide-comprising material is formed over the plurality of said one of the word lines or bit lines. A series of elongated trenches is provided over the plurality of said one of the word lines or bit lines. A plurality of self-assembled block copolymer lines is formed within individual of the trenches in registered alignment with and between the trench sidewalls. A plurality of the other of conductive word lines or conductive bit lines is provided from said plurality of self-assembled block copolymer lines to form individually programmable junctions comprising said metal oxide-comprising material where the word lines and bit lines cross one another.