Tin-Containing Protective Layer for Selective Silicon Etching
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Solution Overview
Problem
Current plasma etching methods for silicon-containing films face challenges in achieving precise and selective etching while protecting sidewall surfaces and masks, leading to inefficiencies in etching selectivity and mask dimension control.
Innovation Solution
The method involves forming a protective layer containing tin atoms on the substrate surface, which is then etched using plasma-generated chemical species, allowing for simultaneous layer formation and etching while protecting sidewall surfaces and masks, thereby enhancing etching selectivity and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional plasma etching methods are used for silicon-containing films, then etching can be performed, but etching selectivity is insufficient and mask dimension control is poor
Solution Approach 1:
A protective layer containing tin atoms is formed on the substrate surface before the etching process. This preliminary action creates a protective barrier that enables selective etching of the silicon-containing film while preserving the mask and sidewall surfaces, thereby improving etching selectivity without sacrificing productivity
Solution Approach 2:
The tin-containing protective layer acts as an intermediary substance between the plasma etching process and the substrate. It provides etching resistance to protect unwanted areas while allowing controlled etching of the target region, achieving both high selectivity and efficient throughput
2Reliability
If conventional plasma etching is used without protective layer, then processing is simpler, but sidewall surfaces and masks are not protected
Solution Approach 1:
The protective layer is formed in advance before etching, providing reliable protection to sidewall surfaces and masks. This preliminary protective measure ensures that these structures remain intact during the etching process, improving reliability without significantly increasing process complexity
Solution Approach 2:
The protective layer contains tin atoms with specific physical and chemical properties that provide etching resistance. By changing the material composition parameter of the protective layer to include tin, reliable sidewall protection is achieved while maintaining a relatively simple process structure
3Manufacturing precision
If protective layer with high etching resistance is used, then selectivity improves, but removal of protective layer becomes difficult
Solution Approach 1:
The protective layer is designed with specific material parameters where tin atoms provide high etching resistance during the etching process, but the layer can be easily removed afterward through selective chemical reactions or plasma treatment. This parameter optimization achieves both high selectivity and ease of removal
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 high-throughput etching with improved selectivity and mask adjustment capabilities, as the tin-containing protective layer provides enhanced etching resistance and ease of removal, reducing contamination risks.
Implementation Method 1
plasma-generated chemical species
Implementation Method 2
In the plasma etching of the silicon-containing film
Data Source
AI summary
An etching method includes forming a protective layer containing a tin atom on a surface of a substrate. The substrate has a region to be etched and a mask provided on the region. The etching method further includes etching the region in the substrate using the mask.