Mask Protection via Plasma Deposit in Film Etching
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Solution Overview
Problem
In film etching processes for electronic device manufacturing, existing methods often result in the reduction of mask thickness and decreased etching efficiency due to the direct exposure of masks to etching processes, leading to inefficiencies and potential damage.
Innovation Solution
A method involving the selective formation of a deposit on the top surface of the mask during the film etching process, using plasma processing to create a protective layer that prevents ions from reaching the mask, thereby maintaining mask thickness and enhancing etching efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mask is directly exposed to the etching process, then the etching of the film can proceed, but the mask thickness is reduced and etching efficiency decreases
Solution Approach 1:
A deposit layer is formed on the mask surface before the etching process begins. This preliminary deposition of carbon-containing material creates a protective barrier that prevents direct interaction between ions and the mask, thereby maintaining mask thickness while enabling efficient film etching to proceed
Solution Approach 2:
The deposit layer acts as an intermediary between the ions and the mask. It absorbs the ion bombardment and protects the mask from direct damage, allowing the etching process to maintain high efficiency without reducing mask thickness
2Productivity
If ions are supplied to the substrate during etching, then the etching reaction is enhanced, but the mask is damaged due to ion exposure
Solution Approach 1:
The carbon-containing deposit layer serves as an intermediary that intercepts ions before they reach the mask. This mediator absorbs the harmful ion bombardment while allowing the etching reaction to proceed efficiently on the film, thus enhancing etching rate without causing mask damage
Solution Approach 2:
The deposit layer, which could be considered waste material, is converted into a beneficial protective element. It absorbs the harmful ion energy that would otherwise damage the mask, transforming a potential negative effect into a protective mechanism that enables higher etching rates
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 method effectively protects the mask from etching damage and maintains its thickness while ensuring efficient film etching by using a deposit formed from plasma processing gases, which selectively shields the mask from ion exposure.
Implementation Method 1
forming, on the substrate, a layer of chemical species included in plasma of a processing gas
Implementation Method 2
supplying ions from plasma of an inert gas to the substrate, thereby causing the chemical species and the film to react with each other
Data Source
AI summary
An etching method includes a step of selectively forming deposit on a top surface of a mask disposed on a film of a substrate, a step of etching the film after the step of forming the deposit, a step of forming a layer of chemical species included in plasma of a processing gas, on the substrate, and a step of supplying ions from plasma of an inert gas to the substrate so that the chemical species react with the film.