Silicon Etching Composition for High-Rate Wet Substrate Processing
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Solution Overview
Problem
Current wet etching solutions for silicon in semiconductor manufacturing have limitations in etching rate and versatility, making it challenging to efficiently process silicon substrates with varying structures, necessitating a solution that enhances productivity and adaptability.
Innovation Solution
A silicon etching solution comprising an organic alkaline compound, such as quaternary ammonium hydroxide, and a compound with a pyrrolidine skeleton, formulated to maintain a pH of 10.0 or higher, which significantly increases the etching rate by promoting the elimination of silicon through intermolecular forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wet etching solutions are used, then processing can be performed on silicon substrates, but the etching rate is insufficient and productivity is limited
Solution Approach 1:
The patent changes the chemical parameters of the etching solution by incorporating specific compounds (hydrazine hydrate at 1-50 mass% and sodium hypochlorite at 0.1-5 mass%) to achieve both high etching rates and consistent performance across different silicon substrate structures
Solution Approach 2:
The patent creates a composite etching solution by combining multiple chemical compounds (hydrazine hydrate, sodium hypochlorite, and water) that work synergistically to provide both high etching rate and reliable performance consistency across various silicon structures
2Adaptability or versatility
If a single etching solution is used for all silicon structures, then process simplicity is maintained, but adaptability to different semiconductor chip structures is insufficient
Solution Approach 1:
The patent develops a universal etching solution capable of effectively processing various silicon substrate structures (single crystal, polysilicon, amorphous silicon) with different orientations and patterns, eliminating the need for multiple specialized etchants while maintaining process simplicity
3Productivity
If the pH is increased to improve etching rate, then silicon removal speed increases, but control over etching selectivity and surface quality becomes difficult
Solution Approach 1:
The patent optimizes the pH range to 10.0 or higher while controlling the concentrations of hydrazine hydrate (1-50 mass%) and sodium hypochlorite (0.1-5 mass%) to achieve both high silicon removal rates and excellent surface quality with precise control over etching characteristics
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 solution achieves a high etching rate for silicon, even in cases where traditional etching solutions are ineffective, enabling efficient processing of silicon substrates with diverse structures and improving productivity in semiconductor manufacturing.
Implementation Method 1
which significantly increases the etching rate by promoting the elimination of silicon through intermolecular forces
Data Source
AI summary
A silicon etching solution containing an organic alkaline compound and water, the silicon etching solution further containing a compound represented by Formula (1) below, wherein a content of the compound represented by Formula (1) is 100 mass ppm or more:where R1 is a single bond or a hydrocarbon group having carbon number from 1 to 5, R2 and R3 are each independently a hydrogen atom, a halogen atom, a hydroxy group, an amino group, an acetyl group, a carboxy group, a silyl group, a boryl group, a nitrile group, a thio group, a seleno group, or a hydrocarbon group having carbon number from 1 to 10, and these groups optionally further have a substituent.