Semiconductor Gate Structure Sidewall Capping Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing integration of memory cells in non-volatile flash memory devices leads to reduced operational reliability due to decreased distances and widths, causing challenges in maintaining reliable electrical properties and preventing metal component migration and oxidation.
Innovation Solution
A semiconductor device design featuring a substrate with a tunnel insulation pattern, a charge storage pattern, a dielectric pattern, a control gate, and a metal-containing gate, where a capping layer made of silicon-based material is selectively formed on the sidewalls of these structures to prevent metal migration and oxidation, and a method for manufacturing this device involving controlled deposition times to ensure the capping layer's formation only on specific areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If memory cells are highly integrated to increase storage capacity, then device density improves, but operational reliability deteriorates due to decreased distances and widths causing metal component migration and oxidation
Solution Approach 1:
A capping layer made of silicon-based material is introduced as an intermediary between the metal-containing gate and the surrounding environment. This capping layer selectively prevents metal component migration and oxidation while maintaining the electrical properties of the memory device, thus resolving the reliability issue caused by high integration density.
Solution Approach 2:
The capping layer is selectively formed only on specific areas where metal components are present, rather than uniformly across the entire device. This localized protection approach maintains device performance while preventing metal migration and oxidation in critical regions, addressing the reliability problem without compromising the benefits of high integration.
2Reliability
If deposition time is extended to ensure complete coverage, then protection quality improves, but manufacturing precision deteriorates due to unwanted capping layer formation on areas where it should not exist
Solution Approach 1:
The deposition process is divided into multiple time periods: an initial period where the capping layer forms on metal-containing areas, and a subsequent period where deposition is stopped before the capping layer forms on non-metal areas. This periodic control of deposition time ensures complete protection where needed while maintaining manufacturing precision by preventing unwanted formation elsewhere.
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 solution enhances operational reliability by preventing metal component migration and oxidation, maintaining a larger cell area, and reducing parasitic capacitance between memory cells, thus improving the overall performance and durability of the flash memory devices.
Implementation Method 1
a capping layer made of silicon-based material is selectively formed on the sidewalls of these structures
Data Source
AI summary
A semiconductor device includes a substrate, a tunnel insulation pattern on the substrate, a charge storage pattern on the tunnel insulation pattern, a dielectric pattern having a width smaller than a width of the charge storage pattern on the charge storage pattern, a control gate having a width greater than the width of the dielectric pattern on the dielectric pattern, and a metal-containing gate on the control gate.