Semiconductor Etching Composition for Rate-Selectivity Balance
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Solution Overview
Problem
Existing etching processes for semiconductor devices face challenges in achieving effective etch rates, selectivity to adjacent layers, and storage stability while minimizing surface residue, which can impact device reliability and integration.
Innovation Solution
An etching composition comprising an oxidizing agent, an accelerator, and an ammonium salt, with specific compounds represented by Formulae 1 and 2, is used to control etching selectivity and rates, ensuring faster etching of certain regions of the metal-containing layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional etching compositions are used to achieve good etch rates, then etching speed is improved, but etching selectivity to adjacent layers deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the etching solution by incorporating specific organic acids (formic acid, acetic acid, propionic acid, or butyric acid) at controlled concentrations (0.1-10 wt%). This parameter change enables simultaneous achievement of high etch rates and improved selectivity to adjacent layers, resolving the trade-off between etching speed and precision.
2Productivity
If aggressive etching conditions are applied to increase productivity, then manufacturing efficiency is improved, but surface residue increases
Solution Approach 1:
The patent adjusts chemical parameters by adding organic acids that modify the etching mechanism to reduce surface residue formation. The specific concentration range (0.1-10 wt%) of organic acids enables aggressive etching conditions to be applied while maintaining clean surfaces, thus improving productivity without generating harmful surface residue.
3Reliability
If etching composition is stored for extended periods to ensure process continuity, then manufacturing reliability is improved, but storage stability deteriorates
Solution Approach 1:
The patent incorporates organic acids that prevent decomposition and precipitation during storage, ensuring the etching composition maintains its effectiveness over extended periods. This enables continuous manufacturing operations with reliable process performance while maintaining storage stability, resolving the contradiction between process continuity and composition stability.
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 composition provides controlled etching selectivity and rates, maintaining stability at high temperatures, enhancing the manufacturing process efficiency of semiconductor devices.
Implementation Method 1
an oxidizing agent
Implementation Method 2
an accelerator
Data Source
AI summary
An etching composition may include an oxidizing agent, an accelerator, an ammonium salt, and an aqueous solvent, wherein the accelerator may include one or more compounds represented by Formula 1, and the ammonium salt may include at least one compound having a structure in which at least one of hydrogen ions (H+) of a hydroxyl group (*—OH) or a thiol group (*—SH) included in the accelerator is substituted with an ammonium cation (NH4+):Formula 1 is as described in the present specification.