Doping Material Layers with Energetic Charged Particles for Etch Control
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Solution Overview
Problem
Conventional etch processes face challenges in achieving practical etch rates and acceptable etch selectivity for new and exotic materials used in semiconductor processing, such as high-k dielectrics and metal-containing materials, which are essential for advanced electronic devices.
Innovation Solution
The method involves doping a material layer on a substrate using energetic charged particles to modify its etch resistance and selectivity, allowing for differential etching relative to other material layers, thereby enhancing the etch process's effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional etch processes are used on new and exotic materials, then the fabrication process can proceed with standard equipment, but the etch rate is insufficient and etch selectivity is poor
Solution Approach 1:
The patent applies preliminary action by doping the material layer with energetic charged particles before performing the etch process. This pre-treatment modifies the material's properties to enable both high etch rate and good etch selectivity during subsequent conventional etching, resolving the contradiction between productivity and manufacturing precision.
Solution Approach 2:
The patent changes the physical and chemical parameters of the material layer through doping with energetic charged particles. This modification alters the material's etch resistance and enables optimal etch rate and selectivity, simultaneously improving both productivity and manufacturing precision.
2Manufacturing precision
If doping with energetic charged particles is applied to modify etch resistance, then etch rate and selectivity are improved, but the process complexity increases
Solution Approach 1:
The patent introduces doping with energetic charged particles as an intermediary step between material deposition and etching. This intermediate treatment modifies the material properties to enable better etch performance, accepting increased process complexity as a trade-off for achieving the required manufacturing 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 enables precise control over the etch rate and selectivity of material layers, facilitating the integration of new materials in semiconductor devices while maintaining the integrity of existing layers, thereby improving the fabrication of advanced electronic components.
Implementation Method 1
doping at least a portion of a material layer on a substrate using energetic charged particles to modify an etch resistance of the material layer
Data Source
AI summary
A method of etching a material layer on a substrate is described. In one embodiment, the method includes modifying an etch resistance of a material layer to a pre-determined etch process by doping the material layer using energetic charged particles, and etching the modified material layer using the pre-determined etch process.