Microcontact Printed Activation Layers for Selective ALD
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Solution Overview
Problem
Current selective-area atomic layer deposition (ALD) techniques face challenges in achieving precise and efficient deposition of patterned thin films on substrates, particularly in controlling film growth on specific areas while avoiding unwanted deposition on other surfaces, such as silicon oxide or dielectric materials.
Innovation Solution
The method involves forming a patterned activation layer on a substrate using microcontact printing or other lithographic techniques, followed by selective vapor deposition, where reactants preferentially react with the activation layer, allowing for controlled deposition of desired films only on the activated areas, thereby maintaining the pattern of the underlying layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If surface passivation is used to control selective-area ALD, then film deposition is prevented on unwanted areas, but the process complexity increases due to the need for additional passivation layers
Solution Approach 1:
Instead of passivating unwanted areas to prevent deposition (conventional approach), the invention activates desired areas to promote deposition while leaving other areas unmodified. This inversion simplifies the process by requiring only activation of specific regions rather than comprehensive passivation of all unwanted areas.
Solution Approach 2:
The invention extracts and removes the need for complex passivation layers by using a substrate-native oxide layer as the foundation for selective activation. This eliminates the requirement for additional passivation materials and simplifies the overall process structure.
2Manufacturing precision
If polymer films are used for surface protection, then unwanted deposition is avoided, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The substrate's native oxide layer serves the dual purpose of being both the substrate surface and the foundation for selective activation. This self-service approach eliminates the need for separate protection layers, as the substrate itself provides the necessary functional layers through its native oxide.
Solution Approach 2:
The native oxide layer is formed preliminarily on the substrate before the ALD process, providing a pre-prepared surface that requires no additional passivation or protection steps. This preliminary formation of the oxide layer streamlines the overall manufacturing process.
3Manufacturing precision
If electron beam induced deposition is used to create patterned catalytic layers, then selective ALD is achieved, but the manufacturing precision and time consumption are adversely affected
Solution Approach 1:
The invention replaces the complex electron beam-induced deposition process with a simpler chemical activation process using ALD. This substitution maintains the ability to create precise patterns while dramatically reducing the time and complexity required for pattern formation.
Solution Approach 2:
The invention changes the fundamental parameter of pattern formation from physical deposition (electron beam) to chemical activation (ALD reactions). This parameter change enables faster and more efficient pattern creation while maintaining high precision through the self-limiting nature of ALD reactions.
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 enables the precise and selective deposition of thin films with desired compositions and thicknesses on patterned activation layers, minimizing unwanted deposition on other substrate surfaces, thus enhancing the control and efficiency of film formation in integrated circuits and other applications.
Implementation Method 1
preparing a patterned catalytic layer that can be for example noble metal. The ALD film is then deposited only on the catalytic layer
Implementation Method 2
Atomic layer deposition (ALD) processes grow thin films through surface reactions between alternately supplied gaseous precursors
Data Source
AI summary
The present application relates to methods of forming patterned thin films on a substrate. In some embodiments a first patterned layer may be deposited on a substrate by a imprint lithography technique, such as microcontact printing. A second layer of a desired composition is selectively deposited over the first patterned layer by a vapor phase deposition process, such as ALD or CVD.