Electron Beam Etching Selectivity and Precision
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Solution Overview
Problem
Current semiconductor processing methods lack efficiency and precision in selectively etching semiconductor surfaces, leading to increased time and cost in manufacturing, and limitations in forming detailed structures.
Innovation Solution
A method utilizing a scanning electron microscope (SEM) to dissociate gases into reactive species using an electron beam, which selectively etches specific materials while concurrently depositing coatings, enhancing selectivity and precision through controlled energy and gas chemistry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional etching techniques are used, then etching can be performed, but processing time is increased and selectivity is insufficient
Solution Approach 1:
The patent replaces conventional chemical etching mechanisms with electron beam-induced plasma etching. The electron beam activates reactive species in the plasma, enabling highly selective and rapid etching of specific materials while leaving others unaffected, thus resolving the contradiction between processing speed and selectivity.
Solution Approach 2:
The patent utilizes controlled electron beam parameters (energy, current density, scanning speed) and plasma chemistry parameters to achieve selective etching. By adjusting these parameters, the process can selectively remove desired materials at high speeds while protecting other materials, simultaneously improving productivity and manufacturing precision.
2Manufacturing precision
If multiple processing steps are used to achieve selectivity, then etching selectivity can be obtained, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple functions (etching, selective removal, and precision control) into a single electron beam plasma etching step. This consolidation eliminates the need for multiple separate processing steps such as mask deposition, chemical etching, and mask removal, thereby reducing device complexity while maintaining high etching selectivity.
Solution Approach 2:
The patent introduces plasma as an intermediary medium that enables selective etching through electron beam activation. The plasma contains reactive species that can be selectively activated by the electron beam to etch specific materials, providing the needed selectivity without requiring multiple processing steps or protective masks.
3Productivity
If conventional etching is used, then material removal can be achieved, but precision and edge profile quality are limited
Solution Approach 1:
The patent applies local quality by using a focused electron beam that can be precisely positioned and scanned across the substrate. The electron beam activates plasma reactions only in the immediate vicinity of the beam, enabling highly localized etching with sharp edge profiles and preventing unwanted etching in adjacent regions, thus achieving both high productivity and precision.
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 reduces processing time, eliminates unnecessary steps, and enhances precision in semiconductor processing, enabling the formation of more detailed structures with sharper edge profiles and reduced material damage.
Implementation Method 1
A method utilizing a scanning electron microscope (SEM) to dissociate gases into reactive species using an electron beam
Implementation Method 2
which selectively etches specific materials while concurrently depositing coatings
Implementation Method 3
concurrently depositing coatings, enhancing selectivity and precision through controlled energy and gas chemistry
Data Source
AI summary
Methods and devices for selective etching in a semiconductor process are shown. Chemical species generated in a reaction chamber provide both a selective etching function and concurrently form a protective coating on other regions. An electron beam provides activation to selective chemical species. In one example, reactive species are generated from a halogen and carbon containing gas source. Addition of other gasses to the system can provide functions such as controlling a chemistry in a protective layer during a processing operation.