Sputtering Atomic Ratio Control via Temperature and Feedback
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Solution Overview
Problem
Existing sputtering technologies face challenges in achieving a predefined atomic ratio of elements in material layers, which is crucial for properties like memristive switching in devices, due to various factors impacting the sputtering process.
Innovation Solution
A system and method that control the sputtering process by adjusting power, temperature, and plasma properties to maintain a predefined atomic ratio of elements, using multiple sputter sources and magnetic fields to ensure homogenous deposition, and employing a control system to adapt operation parameters based on real-time data from sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sputtering is used to deposit material layers with multiple elements, then the deposition process can be performed, but the atomic ratio of elements in the deposited layer deviates from the predefined stoichiometry
Solution Approach 1:
The system employs a control unit that receives real-time data from sensors monitoring the sputtering process and dynamically adjusts operation parameters (power, pressure, gas flow) to maintain the predefined atomic ratio. This closed-loop feedback mechanism compensates for deviations and ensures consistent stoichiometry across the deposited material layer.
Solution Approach 2:
The invention modifies multiple sputtering parameters simultaneously (power applied to targets, chamber pressure, reactive gas flow rates) to control the deposition rate of each element. By dynamically changing these parameters based on real-time measurements, the system achieves precise control over the atomic ratio in the deposited layer.
2Productivity
If sputtering process parameters are not controlled, then the deposition can proceed quickly, but various factors impact the stoichiometry and homogeneity of the material layer
Solution Approach 1:
The system transitions from static, pre-set sputtering parameters to dynamic, real-time adjustment of operation parameters. The control unit continuously modifies power, pressure, and gas flow during deposition based on sensor feedback, allowing the process to adapt to changing conditions while maintaining homogeneity and stoichiometry.
Solution Approach 2:
Sensors monitor key process parameters (power, pressure, deposition rate) in real-time, and the control unit uses this feedback to automatically adjust settings. This ensures that the deposition process maintains optimal conditions for both productivity and material layer quality throughout the entire deposition cycle.
3Ease of manufacture
If multiple elements are sputtered without controlled parameters, then the deposition process is simple, but the atomic ratio between elements cannot be maintained
Solution Approach 1:
The sputtering system performs self-regulation through automated feedback control. Sensors monitor the deposition process and the control unit automatically adjusts parameters to maintain the correct atomic ratio, eliminating the need for manual intervention while ensuring precise stoichiometry control.
Solution Approach 2:
The system dynamically adjusts multiple parameters (power to each target, reactive gas flow, chamber pressure) to control the deposition rate of each element. These parameter changes are automatically managed by the control unit based on real-time sensor data, maintaining precise atomic ratios without complicating the overall process for the operator.
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
The system effectively generates material layers with consistent stoichiometry and homogenous properties across substrates, enhancing the reliability and performance of memristive devices by maintaining precise atomic ratios and minimizing diffusion issues.
Implementation Method 1
A sputter source (104) may include a first target (106(1)) and a second target (106(2)), mounted to a common magnet system (206), configured to generate a first magnetic field (208(1)) through the first target (106(1)) and a second magnetic field (208(2)) through the second target (106(2))
Implementation Method 2
A sputter source (104) may include a first target (106(1)) and a second target (106(2))
Implementation Method 3
In general, material layers (e.g., thin films) may be generated using a variety of physical vapor deposition or chemical vapor deposition processes
Data Source
AI summary
According to various aspects, a method is provided including: depositing a material layer on a substrate, wherein the material layer includes at least a first element and a second element in a predefined atomic ratio, wherein the first element has a higher temperature-dependent re-evaporation rate from the substrate and/or the material layer than the second element; wherein depositing the material layer includes: generating a deposition material stream for deposition on the substrate, wherein the deposition material stream includes an atomic ratio of the first element to the second element higher than the predefined atomic ratio, and setting a temperature of the substrate to evaporate atoms of the first element from the substrate and/or the material layer such that the material layer has the predefined atomic ratio of the first element and the second element.