Spin Polarizer Structure for Uniform Plasma Edge Etching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing substrate processing methods using plasma etching face challenges with non-uniform plasma density and ion distribution, leading to uneven etching and reduced flatness, particularly at the edge of the substrate.
Innovation Solution
A substrate processing apparatus equipped with a spin polarizer having a ferromagnetic thin layer, which aligns and adjusts the spin directions of plasma particles using a magnetized polarizer to enhance reactivity and control etching processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plasma is used for dry etching, then etching capability is improved, but substrate flatness deteriorates due to non-uniform plasma density and electric potential gradients
Solution Approach 1:
The spin polarizer is positioned specifically at the edge region of the substrate to address local plasma non-uniformity. By applying a magnetic field only at the edge where plasma density gradients are most severe, the invention creates local quality improvement without affecting the entire substrate uniformly, thus maintaining etching capability while improving edge flatness.
Solution Approach 2:
The spin polarizer acts as an intermediary component between the plasma source and the substrate. It introduces a magnetic field that mediates the interaction between plasma particles and the substrate surface, aligning electron spins to modify plasma characteristics and reduce electric potential gradients, thereby improving substrate flatness without compromising etching performance.
2Productivity
If plasma density is increased to improve etching rate, then productivity is improved, but plasma uniformity deteriorates leading to worse substrate flatness
Solution Approach 1:
Rather than attempting to uniformize plasma across the entire substrate, the invention applies the spin polarizer locally at the edge region where non-uniformity is most problematic. This localized approach allows high plasma density to be maintained for high etching rates while correcting uniformity issues only where they occur most severely.
3Manufacturing precision
If magnetic field is applied to align plasma spin directions, then substrate flatness is improved, but device complexity increases
Solution Approach 1:
The spin polarizer employs a thin ferromagnetic film structure that can be integrated into the existing plasma processing chamber. This thin-film approach minimizes the physical footprint and structural complexity while still generating the necessary magnetic field for spin alignment, thus improving substrate flatness without significantly increasing device complexity.
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 apparatus achieves consistent plasma particle alignment, improving etching uniformity and reducing energy thresholds by up to 60% and etch rate by up to 35%, enhancing substrate processing efficiency.
Implementation Method 1
The thin layer includes a ferromagnetic material
Implementation Method 2
spin polarizer having a ring shape and spaced upward from the stage. The spin polarizer includes a polarizer body having a ring shape, and a thin layer on a surface of the polarizer body. The thin layer includes a ferromagnetic material.
Implementation Method 3
a spin polarizer on an edge of the stage and spaced upward from the stage. The spin polarizer includes a polarizer body, and a thin layer at least partially surrounding at least one of an inner surface, a top surface, and a bottom surface of the polarizer body.
Data Source
AI summary
A substrate processing apparatus includes a process chamber providing a process space, a stage configured to support a substrate, a gas injection unit spaced upward from the stage in the process space, and a spin polarizer having a ring shape and spaced upward from the stage. The spin polarizer includes a polarizer body having a ring shape, and a thin layer on a surface of the polarizer body. The thin layer includes a ferromagnetic material.