Semiconductor Gate Capping Pattern for Hydrogen Diffusion Control
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Solution Overview
Problem
As semiconductor devices are scaled down, the operating characteristics of MOSFETs deteriorate, leading to challenges in achieving excellent performance while maintaining process margins during manufacturing.
Innovation Solution
A semiconductor device design featuring a gate electrode with an upper capping pattern and a lower capping pattern, where the lower capping pattern includes a first portion between the gate electrode and the upper capping pattern, and second portions extending onto the side surfaces of the upper capping pattern, with the upper capping pattern covering the topmost surface of the lower capping pattern, and an interlayer dielectric layer covering the structure to maintain electrical characteristics and process margins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MOSFET sizes are scaled down to increase integration, then device density increases, but operating characteristics deteriorate
Solution Approach 1:
The capping structure is divided into multiple segments: lower capping pattern with first and second portions, and an upper capping pattern. This segmentation allows each part to serve specific functions - the lower capping protects the gate electrode while the upper capping provides additional protection and planarization, collectively improving device performance without requiring further scaling
Solution Approach 2:
The invention transitions from a single-layer capping structure to a multi-layer vertical structure. By adding the upper capping pattern above the lower capping pattern, the solution addresses operating characteristic deterioration through vertical dimensionality rather than horizontal scaling, thus improving reliability without compromising integration density
2Manufacturing precision
If process margins are reduced to achieve finer features, then manufacturing precision increases, but process stability decreases
Solution Approach 1:
The lower capping pattern is formed beforehand to protect the gate electrode before subsequent processing steps. This preliminary protective action ensures that the gate electrode maintains its dimensions and shape throughout manufacturing processes, preserving process margins while achieving fine feature control
Solution Approach 2:
The multi-layer capping structure provides a cushioning effect against process variations. The lower capping pattern protects the gate electrode, while the upper capping pattern provides additional protection and planarization, collectively cushioning against manufacturing variations and maintaining process stability
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 design improves electrical characteristics and maintains a process margin by controlling hydrogen diffusion and etching resistance, making it easier to control threshold voltage and minimize capping pattern loss during manufacturing.
Implementation Method 1
The design improves electrical characteristics and maintains a process margin by controlling hydrogen diffusion
Implementation Method 2
The design improves electrical characteristics and maintains a process margin by controlling hydrogen diffusion and etching resistance
Data Source
AI summary
Disclosed are semiconductor devices and methods of manufacturing the same. The semiconductor device comprises a gate electrode on a substrate, an upper capping pattern on the gate electrode, and a lower capping pattern between the gate electrode and the upper capping pattern. The lower capping pattern comprises a first portion between the gate electrode and the upper capping pattern, and a plurality of second portions extending from the first portion onto corresponding side surfaces of the upper capping pattern. The upper capping pattern covers a topmost surface of each of the second portions.