Semiconductor Device Gate Isolation Layer Etch Control
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Solution Overview
Problem
The demand for highly integrated, high-performance, and high-speed semiconductor devices poses challenges, particularly in minimizing the short channel effect, which existing technologies like FinFETs and GAA transistors have not fully addressed in terms of device integration and etch-rate management.
Innovation Solution
A semiconductor device design featuring a substrate with active regions, a device isolation layer, and gate structures that overlap the active regions, along with a low etch-rate impurity region formed within the device isolation layer to prevent over-etching and enhance device reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the device isolation layer is etched to form gate structures, then the gate structures can be formed and devices can be integrated, but over-etching may occur causing bridging defects between adjacent gate electrodes
Solution Approach 1:
The device isolation layer is modified to have different etch rates in different regions: a first region with a first etch rate and a second region with a second etch rate lower than the first etch rate. This local differentiation allows the etching process to stop at the intended depth in the second region, preventing over-etching and bridging defects while maintaining device integration capability.
Solution Approach 2:
The device isolation layer is prepared in advance with regions of different etch rates before the gate structure formation process. This preliminary structuring of the isolation layer ensures that during subsequent etching operations, the etch rate is automatically controlled to prevent over-etching, eliminating the need for additional process steps to prevent bridging defects.
2Reliability
If conventional FinFET or GAA transistor structures are used, then three-dimensional channels can be formed to overcome short channel effect, but etch-rate management and device integration challenges remain
Solution Approach 1:
The device isolation layer is engineered with spatially varying etch rates, creating regions with different etch characteristics. This allows precise control of the etching process during gate structure formation, simplifying etch-rate management while maintaining the three-dimensional channel structure needed to overcome short channel effects.
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 design effectively minimizes the short channel effect and improves the yield and reliability of semiconductor devices by preventing bridging defects between adjacent gate electrodes, thus addressing the integration and etch-rate challenges in existing technologies.
Implementation Method 1
An impurity region may be disposed below the gate separation pattern and in the device isolation layer. The impurity region has a lower etch-rate than the device isolation layer.
Data Source
AI summary
A semiconductor device includes a substrate, an active region disposed on the substrate and extending in a first direction, a device isolation layer adjacent to the active region, a gate structure disposed in the active region, the gate structure extending in a second direction crossing the first direction, and covering a portion of the device isolation layer, a gate separation pattern contacting an end of the gate structure, and an impurity region disposed below the gate separation pattern and on the device isolation layer.