Semiconductor Wafer Grinding Fluid Additives Against Wheel Glazing
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Solution Overview
Problem
Grinding silicon carbide semiconductor wafers poses challenges due to the material's hardness, brittleness, and potential for excessive tool wear, heat generation, cracks, and fractures, along with achieving precise dimensions and surface finishes.
Innovation Solution
Incorporating additives such as oxidizing agents, etchants, surfactants, or lubricants in the grinding fluid to manage abrasive surface glazing and improve grinding characteristics, including the use of actuatable additives activated by external stimuli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional grinding is used on silicon carbide wafers, then material removal is achieved, but excessive tool wear and wheel glazing occur
Solution Approach 1:
The patent introduces a fluid containing additives as an intermediary medium between the abrasive wheel and silicon carbide wafer. The additives (oxidizing agents, etchants, surfactants, or lubricants) modify the interaction at the interface, reducing direct mechanical adhesion and minimizing wheel glazing while maintaining effective material removal
Solution Approach 2:
The patent changes the chemical and physical parameters of the grinding fluid by incorporating specific additives. These additives alter the tribological properties of the fluid, reducing friction and preventing abrasive material loading on the wheel, thereby reducing tool wear while maintaining productivity
2Productivity
If conventional grinding is used on silicon carbide wafers, then material removal is achieved, but heat generation and crack formation occur
Solution Approach 1:
The fluid with additives acts as a thermal intermediary, absorbing and dissipating heat generated during grinding. The additives enhance the fluid's heat capacity and thermal transfer properties, preventing excessive heat buildup that would cause thermal stress and crack formation in the brittle silicon carbide material
Solution Approach 2:
The patent applies the fluid containing additives beforehand during the grinding process to cushion against thermal and mechanical shocks. The lubricant and surfactant components reduce friction and prevent sudden thermal spikes that could lead to crack formation in the hard, brittle silicon carbide wafer
3Productivity
If conventional grinding is used on silicon carbide wafers, then material removal is achieved, but difficulty in achieving precise dimensions and surface finishes occurs
Solution Approach 1:
The patent converts the naturally occurring wheel glazing and abrasive loading (harmful effects) into beneficial conditions. The additives promote controlled formation of a lubricating film and modify the wear debris characteristics, transforming what would be harmful clogging into a beneficial lubrication regime that improves surface finish and dimensional accuracy
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 additives enhance the grinding process by reducing wheel glazing, abrasive material loading, and improving surface quality, while controlling the grinding parameters for precise dimensions and surface finishes.
Implementation Method 1
The additive includes one or more of an oxidizing agent, an etchant, a surfactant, or a lubricant
Implementation Method 2
The additive includes one or more of an oxidizing agent, an etchant, a surfactant, or a lubricant
Implementation Method 3
The additive includes one or more of an oxidizing agent, an etchant, a surfactant, or a lubricant
Implementation Method 4
The additive includes one or more of an oxidizing agent, an etchant, a surfactant, or a lubricant
Data Source
AI summary
Systems and methods for grinding semiconductor workpieces are provided. In one example, a method includes providing a surface of the semiconductor workpiece against a grinding apparatus. The grinding apparatus includes an abrasive surface. The method further includes imparting relative motion between the abrasive surface and the semiconductor workpiece to implement a grinding operation on the semiconductor workpiece. The method further includes providing a fluid to the surface of the semiconductor workpiece or the abrasive surface during the grinding operation. The fluid includes an additive. The additive includes one or more of an oxidizing agent, an etchant, a surfactant, or a lubricant.