Compound Semiconductor Plasma Etching for Vertical Fine Patterns
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Solution Overview
Problem
Compound semiconductors, such as III-V group materials, face challenges in anisotropic processing due to low volatility, leading to tapered pattern formation and the need for high-temperature processing with expensive mask materials.
Innovation Solution
A semiconductor device manufacturing method involving plasma etching, damage layer formation using light element ions, and subsequent removal by wet etching or plasma processing to achieve vertical pattern cross-sections at lower temperatures, utilizing a combination of plasma and wet etching processes to control ion energy and pressure for precise ion incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If plasma etching is performed on compound semiconductor materials, then pattern formation is achieved, but tapered cross-sections are formed due to low material volatility
Solution Approach 1:
A damage layer is formed on the pattern surface before the main etching process through ion irradiation. This preliminary damage layer modification enables subsequent selective removal that corrects the tapered shape, achieving vertical cross-sections that would otherwise be impossible with conventional plasma etching alone
Solution Approach 2:
A damage layer is introduced as an intermediary structure between the mask and the final pattern. This damage layer serves as a mediator that, when selectively removed, transforms the tapered etched profile into a vertical cross-section without requiring changes to the fundamental plasma etching process
2Manufacturing precision
If high temperature processing is used to enable anisotropic etching, then vertical patterns can be formed, but expensive high-temperature resistant mask materials are required
Solution Approach 1:
The invention changes the physical state and properties of the pattern surface by forming a damage layer through ion irradiation. This parameter change enables the use of lower-cost mask materials and lower processing temperatures, as the damage layer provides the necessary etching selectivity without requiring high-temperature conditions
Solution Approach 2:
The damage layer acts as a temporary, disposable structure that is formed, utilized for selective etching, and then removed. This disposable intermediate structure enables the use of cheaper mask materials that would otherwise be insufficient for high-temperature anisotropic etching processes
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
Enables the formation of fine patterns with vertical cross-sections using compound semiconductor materials without the need for high-temperature processing, reducing costs and expanding the choice of mask materials, including photoresist.
Implementation Method 1
the semiconductor material is plasma-etched
Implementation Method 2
a damage layer is formed on the semiconductor material
Data Source
AI summary
A semiconductor device manufacturing method includes the steps of etching a semiconductor material by using plasma, forming a damage layer on the semiconductor material, and removing the damage layer such that a relatively low temperature process can form a fine pattern with a vertical cross section using a compound semiconductor material or the like.