Efficient Annealing for Memory Device Fabrication
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Summary
Problems
Conventional semiconductor processes for producing memory structures using transition-metal oxides are inefficient due to the need for individual cell formation through high-voltage electrical forming, which is time-consuming and damages the material, while also requiring high thermal budgets that can affect underlying structures.
Innovation solutions
A method involving the annealing of a transition-metal-and-oxygen-containing material at high temperatures (above 500°C) for a short duration (less than one second) to reduce resistance and create defects similar to forming operations, allowing for the production of pre-formed material layers that can be used in multiple cells, thereby reducing the need for individual forming processes and minimizing thermal impact on underlying structures.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conventional forming processes are performed on each cell individually, then resistance is reduced, but production efficiency is low and time is consumed
Why choose this principle:
The patent merges individual cell forming processes into a single bulk annealing process that treats the entire oxide film simultaneously. The annealing chamber processes all cells in parallel at temperatures between 400-2000°C for durations of 1 nanosecond to 100 seconds, eliminating the need for sequential individual forming and dramatically improving production efficiency while achieving the required resistance reduction.
Principle concept:
If conventional forming processes are performed on each cell individually, then resistance is reduced, but production efficiency is low and time is consumed
Why choose this principle:
The patent performs preliminary bulk annealing of the entire oxide film before individual cell formation. This preliminary action creates defects and reduces resistance across the entire film in advance, so that subsequent individual cell forming requires less additional processing and achieves the desired resistance levels more efficiently.
Application Domain
Data Source
AI summary:
A method involving the annealing of a transition-metal-and-oxygen-containing material at high temperatures (above 500°C) for a short duration (less than one second) to reduce resistance and create defects similar to forming operations, allowing for the production of pre-formed material layers that can be used in multiple cells, thereby reducing the need for individual forming processes and minimizing thermal impact on underlying structures.
Abstract
Exemplary methods of forming a memory structure may include forming a layer of a transition-metal-and-oxygen-containing material overlying a substrate. The substrate may include a first electrode material. The methods may include annealing the transition-metal-and-oxygen-containing material at a temperature greater than or about 500° C. The annealing may occur for a time period less than or about one second. The methods may also include, subsequent the annealing, forming a layer of a second electrode material over the transition-metal-and-oxygen-containing material.