3D CMP Pad Hardness Zoning for Uniform Wafer Planarization
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Solution Overview
Problem
The challenge in semiconductor manufacturing is the increased complexity of chemical-mechanical polishing (CMP) processes, particularly in the 3 nm or lower regime, where traditional CMP systems face issues with planarization efficiency and CMP-induced defects, leading to non-uniform material removal and reduced yield.
Innovation Solution
A 3D polishing pad is developed with varying hardness and structure, composed of hard, soft, and pore fractions, formed using 3D printing, to enhance planarization efficiency and minimize defects by optimizing material removal rates and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional CMP systems increase planarization efficiency, then material removal rate is improved, but CMP-induced defects increase
Solution Approach 1:
The polishing pad is divided into multiple zones with different hardness characteristics. The first zone has a first hardness and the second zone has a second hardness different from the first. This allows each zone to be optimized for specific functions: one zone for aggressive material removal and another for defect-free polishing, thereby achieving high planarization efficiency without increasing CMP-induced defects.
Solution Approach 2:
The polishing pad is segmented into distinct zones with different mechanical properties. By segmenting the pad into a first zone and a second zone with different hardness values, the system can simultaneously achieve high material removal rates in one zone while maintaining low defect generation in another zone, resolving the contradiction between productivity and defect reduction.
2Productivity
If traditional CMP systems increase material removal rate, then planarization efficiency is improved, but uniformity of material removal decreases
Solution Approach 1:
Different zones of the polishing pad are assigned different hardness characteristics to address local variations in polishing requirements. The first zone with its specific hardness optimizes for material removal rate, while the second zone with a different hardness optimizes for uniformity and planarity. This local differentiation allows the system to achieve both high productivity and manufacturing precision simultaneously.
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 3D polishing pad significantly improves planarization efficiency and uniformity, reducing CMP-induced defects and enhancing manufacturing yield by maintaining consistent material removal rates across different wafer zones.
Implementation Method 1
chemical-mechanical polishing (CMP) process which is often used to selectively remove high elevation features by a combination of mechanical polishing and chemical reaction
Implementation Method 2
A 3D polishing pad is developed with varying hardness and structure, composed of hard, soft, and pore fractions, formed using 3D printing
Data Source
AI summary
A chemical mechanical polishing device is provided according to some embodiments. The chemical mechanical polishing device comprises a polishing pad. The polishing pad includes a plurality of stacks of first pad fractions and a plurality of stacks of second pad fractions. The first pad fractions and the second pad fractions have different hardness. The stacks of first pad fractions and the stacks of the second pad fractions are arranged with a pattern corresponding to a predetermined feature of a structure to be polished by the chemical mechanical polishing device. The predetermined feature may include a surface profile or a material of the structure to be polished.