Substoichiometric Oxide Layer Sputtering With In-Situ Oxygen Removal
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Solution Overview
Problem
Existing methods for producing oxygen-substoichiometric layers of titanium, vanadium, or molybdenum oxides, such as Magneli phases, require high energy input and are difficult to control, especially through magnetron sputtering processes that involve oxidizing atmospheres.
Innovation Solution
A method involving magnetron sputtering with a target made of titanium, vanadium, or molybdenum oxide, using a vacuum chamber with inert gas and simultaneous application of radiofrequency potentials to the target and substrate to control the sputtering process, removing oxygen atoms to achieve substoichiometric layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high temperature heating is used to produce Magneli phases, then the desired substoichiometric oxide layers are obtained, but energy consumption increases significantly
Solution Approach 1:
The invention uses plasma phase transitions instead of thermal heating. Radiofrequency excitation creates a plasma state in the reactive gas atmosphere, enabling chemical reactions and material deposition at lower temperatures while achieving the desired substoichiometric oxide composition through controlled plasma chemistry rather than thermal processes
Solution Approach 2:
The invention changes the fundamental parameter from temperature to radiofrequency power and gas composition. By controlling RF power, gas pressure, and reactive gas composition, the process achieves precise compositional control of Magneli phases without requiring high temperature heating, thus reducing energy consumption while maintaining manufacturing precision
2Quantity of substance
If magnetron sputtering is performed in an oxygen atmosphere to enrich titanium with oxygen, then oxide layers are formed, but the process becomes difficult to control and Magneli phases cannot be reliably obtained
Solution Approach 1:
The invention changes the controlling parameters from oxygen partial pressure to radiofrequency power ratio and gas composition. By controlling the ratio of RF power applied to substrate versus target, and using specific reactive gas mixtures, the process achieves precise control over oxygen incorporation and Magneli phase formation, transforming an uncontrollable process into one with multiple adjustable parameters
Solution Approach 2:
The invention introduces dynamic control through independent RF power adjustment for both target and substrate. This allows real-time optimization of the sputtering and oxygen incorporation processes, enabling precise control over oxide layer composition and Magneli phase formation that was not possible with static oxygen atmosphere control
3Manufacturing precision
If dual radiofrequency potentials are applied to simultaneously deposit and deoxygenate the oxide layer, then substoichiometric layers are achieved, but device complexity increases
Solution Approach 1:
The invention makes the magnetron sputtering system multi-functional by enabling both deposition and deoxygenation functions within the same chamber using dual RF sources. The substrate and target can independently receive RF power, allowing the system to perform multiple operations (sputtering, oxygen incorporation, and oxygen removal) without requiring additional specialized equipment, thus managing complexity while achieving precise stoichiometry control
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 method achieves energy-efficient and controllable production of substoichiometric oxide layers with properties similar to Magneli phases, demonstrating high conductivity and resistance, as evidenced by low electrical resistivity and stability in acidic environments.
Implementation Method 1
a first radiofrequency potential is applied to a target to be sputtered, so as to deposit a layer of titanium oxide on a substrate
Implementation Method 2
a second radiofrequency potential is applied to the substrate so as to sputter the layer of titanium oxide deposited on the substrate to extract oxygen atoms from this layer
Implementation Method 3
generate, in the chamber, a plasma suitable for simultaneously i) sputtering the target to deposit a layer of titanium oxide on the substrate, and ii) sputtering this layer of titanium oxide deposited on the substrate to extract oxygen atoms from this layer
Data Source
AI summary
The present invention relates to a method for producing a substoichiometric oxygen layer from titanium, vanadium, tungsten or molybdenum oxide on a substrate by magnetron sputtering a target in a chamber, the method being characterised in that the target consists of titanium, vanadium, tungsten or molybdenum oxide and in that it comprises the steps of: a) creating a vacuum in the chamber and adding an inert gas to same; b) simultaneously applying a first radiofrequency potential to the target and a second radiofrequency potential to the substrate so as to generate, in the chamber, a plasma that is suitable for simultaneously i) sputtering the target to deposit a layer of the titanium, vanadium, tungsten or molybdenum oxide on the substrate; and ii) sputtering the layer of titanium, vanadium, tungsten or molybdenum oxide deposited on the substrate to remove oxygen atoms from the layer.