Planarization Process Using Sputtering and Patterning
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Solution Overview
Problem
Existing planarization methods, such as Chemical Mechanical Polishing (CMP), face challenges in achieving surface flatness within tight tolerances, especially when material layers cover nonuniform features of varying lengths, widths, and heights, leading to inconsistent loading conditions during sputtering.
Innovation Solution
A method involving patterning the material layer using photolithography to create a uniform distribution of loading conditions, followed by sputtering with Ar or N plasma, allowing for controlled sputtering parameters to achieve a flat surface by adjusting sputtering time and intensity based on feature morphology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Chemical Mechanical Polishing (CMP) is used for planarization, then a relatively planar surface can be obtained, but it is difficult to control surface flatness within tight tolerances when the material layer covers nonuniform features
Solution Approach 1:
The patent applies local quality by patterning the material layer to create regions with different loading conditions. Specifically, the material layer is patterned to have openings or recesses in areas with higher material thickness, creating a more uniform distribution of loading conditions across the substrate during sputtering. This local modification of the material layer structure enables consistent planarization within tight tolerances even when underlying features are nonuniform.
2Manufacturing precision
If the material layer covers features of nonuniform lengths, widths, and heights, then the loading condition for sputtering becomes nonuniform, but patterning the material layer can reduce this non-uniformity
Solution Approach 1:
The patent applies preliminary action by performing patterning of the material layer before the sputtering planarization step. This preliminary patterning creates a pre-compensated structure where regions that would otherwise have higher material thickness (and thus higher loading conditions) are reduced or opened up. This advance preparation ensures that when sputtering occurs, the loading conditions are already more uniform, leading to better planarization results within tight tolerances.
3Manufacturing precision
If sputtering is performed on a material layer with high non-uniform loading conditions, then planarization is difficult to achieve within desired tolerances, but patterning enables uniform loading conditions for successful planarization
Solution Approach 1:
The patent modifies the material layer locally through patterning to create a more uniform loading condition distribution. By selectively removing or thinning the material layer in specific regions (particularly where underlying features create high loading conditions), the patterned material layer compensates for nonuniformities. This local quality adjustment enables the sputtering process to achieve surface flatness within desired tolerances, resolving the manufacturing difficulty.
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
This approach results in a substantially uniform and flat surface, reducing non-uniformity across the substrate to within several nanometers, meeting desired flatness tolerances while avoiding damage to underlying features.
Implementation Method 1
planarizing the patterned material layer by sputtering
Implementation Method 2
sputtering with Ar or N plasma
Data Source
AI summary
Planarization processing methods are disclosed. In one aspect, the method includes patterning a material layer and planarizing the patterned material layer by using sputtering. Due to the patterning of the material layer, the loading requirements of nonuniformity on a substrate for sputtering the material layer are reduced, compared with that before the patterning.