Semiconductor Contact Diameter Control via Differential Etching
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Solution Overview
Problem
Current semiconductor processing methods face challenges in accurately controlling the diameter of contacts, particularly as devices miniaturize, requiring multiple complex etching steps to achieve varying diameters, which increases manufacturing time and complexity.
Innovation Solution
A semiconductor processing method that utilizes a single etching process with different etching rates for two distinct materials (e.g., nitride and oxide) to form holes with varying diameters, allowing for precise control without additional steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple etching steps are used to form contacts with different diameters, then manufacturing precision is improved, but device complexity and manufacturing time increase
Solution Approach 1:
The patent applies parameter changes by utilizing materials with different etching rates (first material with slower etching rate, second material with faster etching rate) to achieve different contact diameters within a single etching process. This allows precise control of contact dimensions without increasing process complexity
Solution Approach 2:
The patent merges multiple etching operations into a single etching process by strategically placing first and second materials in different regions. The etching process simultaneously forms contacts of different diameters in different areas, combining what would traditionally require separate steps
2Manufacturing precision
If multiple etching steps are used to form contacts with different diameters, then manufacturing precision is improved, but manufacturing time increases
Solution Approach 1:
The patent maintains continuity of useful action by performing all contact formation operations in a single continuous etching process. The etching proceeds simultaneously across the entire substrate, forming all contacts regardless of diameter requirements, eliminating idle time between multiple sequential steps
Solution Approach 2:
Multiple contact formation operations are merged into one etching step, allowing parallel processing of different contact types across the substrate. This consolidation dramatically reduces total manufacturing time while maintaining precise diameter control through material selection
3Length of moving object
If contact diameter is reduced for miniaturization, then device scaling is improved, but manufacturing precision becomes harder to control
Solution Approach 1:
The patent changes material parameters by selecting first and second materials with distinctly different etching rates. This material parameter differentiation provides inherent control over etching depth and contact diameter, enabling precise miniaturization even at reduced dimensions where traditional control methods fail
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
Enables the formation of contacts with desired diameters efficiently and accurately, reducing manufacturing time and complexity by leveraging the anisotropic etch rates between materials to achieve the required dimensions.
Implementation Method 1
utilizing a etching process to etch the first material and the second material to form a hole through the first material and the second material; wherein the etching process has different etching rates for the first material and the second material
Data Source
AI summary
A semiconductor processing method that can generate a hole with different diameters, comprising: providing first material and second material different from the first material; and utilizing a etching process to etch the first material and the second material to form a hole through the first material and the second material; wherein the etching process has different etching rates for the first material and the second material such that the hole have different diameters. A semiconductor structure corresponding to the above-mentioned method is also disclosed.