Semiconductor Memory Electrode Projection via Reactive Material Oxidation
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Solution Overview
Problem
Current methods for manufacturing semiconductor memory devices that store information by changing the state of electrodes with voltage and current application face challenges in reducing power consumption and suppressing element characteristic variations, particularly due to difficulties in forming projections and partial insulation coatings simultaneously while maintaining consistent positional relationships.
Innovation Solution
A method involving the formation of a stacked film with reactive and non-reactive conductive materials, where the reactive material undergoes a chemical reaction to form an insulator, and the non-reactive material does not, allowing for the creation of a projection and insulation coating on the side surface of the stacked film, enabling efficient current flow and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate processes are used for forming projections and insulation coatings, then each structure can be formed independently, but the number of manufacturing steps increases and positional consistency becomes difficult to maintain
Solution Approach 1:
The patent combines the projection formation and insulation coating formation into a single integrated process. By using a stacked film structure where the first conductive material forms the projection and the second conductive material forms the insulation coating simultaneously, the method achieves both structures in one step, reducing manufacturing complexity while maintaining positional consistency.
Solution Approach 2:
The stacked film structure is prepared in advance with the first conductive material having higher reactiveness than the second conductive material. This preliminary arrangement allows the oxidation process to automatically differentiate and form the projection and insulation coating in the correct positions without requiring additional alignment steps.
2Use of energy by moving object
If conventional electrode structures are used without projections and partial insulation, then manufacturing is simpler, but power consumption is higher and element characteristic variations increase
Solution Approach 1:
The patent applies local quality by creating a projection structure with partial insulation coating on the electrode. The insulator is formed only on specific portions of the electrode surface (where the second conductive material is located), while other portions (where the first conductive material forms the projection) remain conductive. This localized differentiation reduces power consumption and suppresses element characteristic variations.
Solution Approach 2:
The electrode is constructed as a composite structure using two different conductive materials with distinct reactiveness to oxidation. The first conductive material (e.g., aluminum) is more reactive and forms the projection, while the second conductive material (e.g., copper or tungsten) is less reactive and forms the insulation coating. This composite approach enables the dual functionality of reducing power consumption while maintaining manufacturing feasibility.
3Manufacturing precision
If the first conductive material is made highly reactive to form the projection, then the projection forms effectively, but controlling the oxidation process becomes more challenging
Solution Approach 1:
The patent controls the oxidation process by adjusting parameters such as oxidation atmosphere composition, temperature, and exposure time. By carefully controlling these parameters, the oxidation process selectively reacts with the first conductive material to form the projection while leaving the second conductive material relatively unaffected, achieving precise projection formation without excessive process complexity.
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 method allows for the simultaneous formation of projections and insulation coatings on the electrode, reducing power consumption and suppressing variations in electrical resistance and element characteristics, while also simplifying the manufacturing process by reducing the number of steps required.
Implementation Method 1
forming a projection by performing an insulator forming process on the exposed side surface of the stacked film to cause a predetermined length of a side surface of the reactive conductive material to change into an insulator
Implementation Method 2
the insulator forming process is an oxidation process or a nitridation process, the reactive conductive material is a material that undergoes a chemical reaction and changes into the insulator in the oxidation process or the nitridation process
Data Source
AI summary
The method of manufacturing a semiconductor memory includes a process of forming a projection by performing an insulator forming process on the exposed side surface of a reactive conductive material and a non-reactive conductive material that are stacked above a substrate so as to change a predetermined length of the side surface of the reactive conductive material into an insulator, and thereby causing the side surface of the non-reactive conductive material to project outward from the side surface of the reactive its conductive material. The insulator forming process is an oxidation process or a nitridation process, the reactive conductive material is a material that reacts chemically and changes into the insulator in the oxidation process or nitridation process, and the non-reactive conductive material is a material that does not change into the insulator in the oxidation process or nitridation process.