Polyphosphazene Mask for Localized Semiconductor Etching
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Solution Overview
Problem
Current chemical etching methods for semiconductors lack effective protection of masked areas, resulting in poor etching quality and fineness, especially when using aggressive solutions.
Innovation Solution
The use of a polyphosphazene-based mask, deposited through electrochemical or electroless processes, provides a thin, durable protective layer that prevents chemical reactivity, allowing for precise and localized etching even with aggressive solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional masks are used for chemical etching, then the etching process can be performed, but the protection quality of the mask is insufficient resulting in poor etching fineness and localized precision
Solution Approach 1:
The patent changes the chemical composition parameters of the mask material from conventional organic polymers to inorganic polyphosphazene, which contains phosphorus-nitrogen bonds that provide superior chemical inertness. This material parameter change enables the mask to resist aggressive oxidizing etching solutions while maintaining thin film morphology for fine etching precision.
Solution Approach 2:
The patent employs composite material structure by combining inorganic polyphosphazene polymer with semiconductor substrate, creating a protective interface that provides both mechanical integrity and chemical resistance. The inorganic nature of polyphosphazene creates a composite system that bridges organic polymer ease of deposition with inorganic material chemical stability.
2Productivity
If aggressive etching solutions are used to increase etching speed, then productivity improves, but the mask protection becomes insufficient leading to poor etching quality
Solution Approach 1:
The patent changes the chemical resistance parameters of the mask material to withstand aggressive oxidizing environments. Polyphosphazene's phosphorus-nitrogen backbone provides high bond energy and chemical inertness, enabling the mask to protect against strong oxidizing etchants like bromine-based solutions while maintaining precise etching boundaries and high etching rates.
Solution Approach 2:
The patent uses thin films of polyphosphazene that can be deposited quickly and provide sufficient protection for the etching process. The thin film nature (nanometer scale) allows for rapid deposition while the high chemical resistance ensures durability during aggressive etching, effectively creating a disposable yet highly protective barrier.
3Manufacturing precision
If thin mask films are used to achieve fine etching, then etching precision improves, but the protective capability of the mask decreases
Solution Approach 1:
The patent changes the material density and chemical bond strength parameters by using inorganic polyphosphazene instead of organic polymers. This material substitution provides higher chemical resistance per unit thickness, enabling thin films to maintain both fine etching precision and superior protective capability against aggressive oxidizing solutions.
Solution Approach 2:
The patent employs thin film technology with polyphosphazene that forms a continuous, conformal coating on the semiconductor surface. The thin film structure (nanometer scale) provides precise pattern definition for fine etching while the inorganic polymer's chemical stability ensures adequate protection duration despite the reduced thickness.
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 polyphosphazene mask ensures complete protection of semiconductor surfaces, maintaining stability against oxidizing solutions, enabling precise and durable etching with minimal material loss, thus improving the quality and longevity of semiconductor components.
Implementation Method 1
Polyphosphazene films have protective properties that protect against the chemical reactivity of surfaces of semiconductor materials
Implementation Method 2
the deposition of the mask comprises the controlled deposition of polyphosphazene by means of an electrochemical process, ie electrochemical deposition
Data Source
AI summary
The invention relates to the chemical etching of a semiconductor material, including:deposition at least one mask (PLP) on a first surface zone of a semiconductor material (SC); andchemically etching (S31) a second surface zone of the semiconductor material (SC) that is not covered by the mask (PLP).In particular, the aforementioned mask is produced in a material including polyphosphazene, which material protects the underlying semiconductor especially well.