Directional Ion Etching for Sub-50 nm Feature Patterning
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Solution Overview
Problem
Conventional photolithography techniques face challenges in patterning complex shapes with well-defined edges and corners, especially at dimensions below 50 nm, due to optics limitations such as diffraction, leading to restricted design flexibility and potential overlay errors.
Innovation Solution
A method involving directional ions in a reactive ambient to etch and merge staggered surface features on a substrate, allowing for the formation of complex 2-dimensional shapes with sharply defined corners by selectively increasing feature size along one direction while preserving edge positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photolithography techniques are used to pattern features at small dimensions, then manufacturing capability is maintained, but manufacturing precision deteriorates due to diffraction and optics limitations
Solution Approach 1:
The patent replaces the optical lithography system with a particle-based direct-write system. Instead of using light to pattern features, the invention uses a focused beam of particles (such as ions or atoms) to directly deposit or remove material, thereby forming patterns without suffering from optical diffraction limits. This substitution enables precise patterning at dimensions below the diffraction limit of light.
2Adaptability or versatility
If conventional lithography is used to create complex 2D shapes, then design flexibility is limited, but manufacturing simplicity is maintained
Solution Approach 1:
The patent employs a dynamic patterning approach where the particle beam can be rapidly steered and repositioned to create arbitrary 2D shapes. The system allows for real-time modification of pattern geometry, enabling complex shapes with sharp corners and precise edges to be formed by controlling the beam trajectory and deposition parameters dynamically during the patterning process.
3Length of moving object
If feature size is reduced to below 50 nm, then device scaling is achieved, but manufacturing precision deteriorates due to rounding and overlay errors
Solution Approach 1:
The patent changes the fundamental parameters of the patterning process by using particle beams with wavelengths much smaller than optical light, enabling precise control of material deposition or removal at the nanoscale. By adjusting particle energy, beam focus, and exposure duration, the system can create features with sharp edges and precise dimensions below 50 nm without the rounding effects characteristic of optical lithography.
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
Enables the precise formation of complex 2-dimensional features with sharp angles, enhancing design flexibility and preventing unwanted material overlap, thereby improving the accuracy of patterned features at sub-50 nm dimensions.
Implementation Method 1
directing first ions in a first exposure to a first side of the first surface feature and a first side of the second surface feature, in a presence of a reactive ambient containing a reactive species, wherein the first exposure etches the first side of the first surface feature and the first side of the second surface feature
Data Source
AI summary
A method of patterning a substrate. The method may include: providing a first surface feature and a second surface feature in a staggered configuration within a layer, the layer being disposed on the substrate, and directing first ions in a first exposure to a first side of the first surface feature and a first side of the second surface feature, in a presence of a reactive ambient containing a reactive species, wherein the first exposure etches the first side of the first surface feature and the first side of the second surface feature, wherein after the directing, the first surface feature and the second surface feature merge to form a third surface feature.