Floating Gate Etch Back Process for Flash Memory Uniformity
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Solution Overview
Problem
Existing methods for forming floating gates in flash memory devices, such as chemical mechanical polishing, often result in loading effects, reduced uniformity, increased processing costs, and leftover conductive material, which affect the performance and efficiency of semiconductor components.
Innovation Solution
A floating gate forming process using an etch back process to form conductive material between isolation structures, avoiding loading effects by performing a pre-etch back process to expose and fill voids, and then etching to create flat-topped floating gates with enhanced uniformity and reduced material waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical mechanical polishing is used to form floating gates, then the floating gates can be formed, but loading effects occur and uniformity is reduced
Solution Approach 1:
The patent replaces the chemical mechanical polishing process with an etch back process to form floating gates. This substitution eliminates the loading effects associated with mechanical polishing while achieving the desired floating gate formation, thereby improving uniformity and eliminating harmful loading effects.
2Ease of manufacture
If conventional floating gate formation methods are used, then floating gates are formed, but processing costs increase
Solution Approach 1:
The patent extracts and removes unnecessary conductive material through the etch back process, eliminating waste material removal steps and reducing processing costs. By directly forming floating gates through etch back without requiring subsequent removal of excess material, the process improves manufacturing efficiency and reduces costs.
3Manufacturing precision
If conventional floating gate formation methods are used, then floating gates are formed, but unnecessary conductive material remains in specific areas
Solution Approach 1:
The etch back process selectively removes unnecessary conductive material through controlled etching, leaving clean floating gates without residual material in specific areas. This replaces conventional methods that leave behind waste material requiring additional removal steps, thereby improving manufacturing precision and reducing material waste.
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 process enhances the performance and uniformity of semiconductor components like flash memory by avoiding loading effects, reducing processing costs, and ensuring flat top surfaces for floating gates, thereby improving the overall efficiency of the semiconductor component formation.
Implementation Method 1
An etch back process is performed on the first conductive material to respectively form floating gates separated from each other in the active areas
Data Source
AI summary
A floating gate forming process includes the following steps. A substrate containing active areas isolated from each other by isolation structures protruding from the substrate is provided. A first conductive material is formed to conformally cover the active areas and the isolation structure. An etch back process is performed on the first conductive material to respectively form floating gates separated from each other in the active areas.