Self-Assembled Monolayer Deposition via Roller Applicator
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Solution Overview
Problem
Current nanolithography methods face challenges in achieving uniform and reproducible nanometer-scale features due to limitations in photoresist deposition techniques, particularly for sub-10 nm thicknesses, and are not well-suited for large-area coating or continuous film deposition, which hinders the development of next-generation ICs, data storage, and solar cells.
Innovation Solution
A method involving the deposition and patterning of self-assembled monolayers (SAMs) using a roller contact applicator and rolling mask exposure apparatus, where a cylinder or cone-shaped applicator is used to deposit SAMs in a moisture-controlled environment, followed by near-field optical lithography with a phase mask or surface plasmon technology to achieve high-resolution patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional photoresist deposition methods (roller applicators, spin coating) are used, then relatively thick photoresist layers (microns range) can be deposited, but sub-100 nm thickness control and uniformity are not achieved
Solution Approach 1:
The patent transitions from liquid photoresist to vapor-phase SAM deposition, changing the physical state parameter. This enables precise thickness control at the nanometer and sub-nanometer scale through vapor pressure and deposition time control, achieving uniformity impossible with liquid deposition methods
Solution Approach 2:
The patent replaces mechanical deposition systems (roller applicators, spin coaters) with vapor-phase deposition. This substitution eliminates the thickness control limitations of mechanical methods and enables atomic-layer precision through controlled vapor condensation
2Manufacturing precision
If liquid phase deposition or vapor phase deposition of SAMs is used, then uniform nanometer-thickness layers can be achieved, but large-area coating and continuous film deposition are not suitable
Solution Approach 1:
The patent employs a dynamic vapor deposition system where the substrate moves through a vapor-saturated environment. This dynamic approach allows continuous deposition over large areas while maintaining the uniformity characteristics of vapor-phase deposition, overcoming the static nature of traditional methods
Solution Approach 2:
The patent implements continuous vapor-phase deposition where SAM molecules continuously condense from vapor onto the moving substrate surface. This continuous process enables large-area coating without the discontinuities inherent in dip-coating or spot-by-spot vapor deposition methods
3Ease of manufacture
If microcontact printing is used for SAM patterning, then pattern transfer can be achieved, but resolution is limited by vapor phase molecule transfer to areas between features
Solution Approach 1:
The patent extracts the harmful vapor-phase SAM transfer that causes pattern washing out in microcontact printing. By using direct vapor deposition onto the substrate followed by selective removal, the method eliminates the uncontrolled vapor transfer to non-patterned areas while maintaining patterning capability
Solution Approach 2:
The patent inverts the traditional microcontact printing approach by first depositing a complete uniform SAM layer via vapor phase, then selectively removing portions to create the pattern. This inversion eliminates the resolution limitation caused by vapor transfer during the patterning process itself
4Manufacturing precision
If standard photolithography with photomask is used, then pattern transfer can be achieved, but development steps are required and resolution is limited by diffraction effects
Solution Approach 1:
The patent extracts and eliminates the development step from the lithography process. By using SAMs that can be directly patterned through selective removal or in-situ modification, the method removes the separate development operation required by traditional photolithography, reducing process complexity
Solution Approach 2:
The patent replaces optical diffraction-limited photolithography with direct vapor-phase SAM deposition and patterning. This substitution eliminates the diffraction limit by using matter-wave deposition instead of light, achieving sub-wavelength resolution without optical constraints
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 deposition of uniform, conformal SAM layers with high resolution and throughput, overcoming the limitations of traditional photoresist deposition methods and achieving sub-100 nm features without the need for development steps, suitable for large-area and continuous film patterning.
Implementation Method 1
SAMs are ordered molecular assemblies formed spontaneously by chemisorption of molecules with suitable anchor groups on a solid surface
Implementation Method 2
Nanometrix company has developed a system for nanoresist deposition base on so called continuous coating process, named Schneider-Picard (SP). Method is performed by sliding elements on the surface of a liquid until they meet the ultra thin film formation line
Implementation Method 3
Evaporation and immersion are the main ways in which the solvent concentration, after spreading the polymer, fades down from the gas-liquid inter-phase
Implementation Method 4
followed by near-field optical lithography with a phase mask or surface plasmon technology to achieve high-resolution patterning
Implementation Method 5
followed by near-field optical lithography with a phase mask or surface plasmon technology to achieve high-resolution patterning
Data Source
AI summary
Embodiments of the invention relate to lithography method useful for patterning at sub-micron resolution. This method comprised of deposition and patterning self-assembled monolayer resists using rolling applicator and rolling mask exposure apparatus. Typically the application of these self-assembled monolayers involves contacting substrate materials with a rotatable applicator in the shape of cylinder or cone wetted with precursor materials. The nanopatterning technique makes use of Near-Field photolithography, where the mask used to pattern the substrate is in contact with self-assembled monolayer. The Near-Field photolithography may make use of an elastomeric phase-shifting mask, or may employ surface plasmon technology, where a rotating mask surface comprises metal nano holes or nanoparticles.