Semiconductor Gate Structure for Dishing-Resistant Planarization
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Solution Overview
Problem
The integration of transistors with different operating voltages in a single semiconductor substrate is challenging due to the need for additional manufacturing steps and increased costs, particularly in achieving efficient planarization processes that avoid the dishing effect and ensure proper device performance.
Innovation Solution
A method is introduced where low-voltage devices share the high-k metal gate processes with high/medium-voltage devices, and a protection structure is formed to support planarization, allowing for the integration of gate stacks and protection structures that mitigate the dishing effect and enhance channel dimensions, thereby reducing manufacturing costs and improving device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate manufacturing processes are used for high-voltage and low-voltage devices, then device performance can be optimized for each voltage range, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the manufacturing processes for high-voltage and low-voltage devices into a single integrated process flow. Both device types share common process steps including gate electrode formation, dielectric layer deposition, and planarization, eliminating the need for separate manufacturing lines while maintaining optimized performance for each voltage range through process parameter adjustments
2Productivity
If planarization is performed without protection structures, then manufacturing steps are reduced, but gate electrodes are lost and device performance deteriorates
Solution Approach 1:
The patent applies preliminary action by forming protection structures (such as spacer layers or protective dielectric layers) over gate electrodes before planarization processes. These protection structures are deposited in advance to prevent gate electrode loss during subsequent CMP or other planarization steps, ensuring gate electrode integrity is maintained while enabling effective planarization to proceed
3Ease of manufacture
If dishing effect occurs during planarization, then manufacturing is simpler, but device performance and channel dimensions are compromised
Solution Approach 1:
The patent applies local quality by using protection structures with spatially varying properties or selectively positioned layers that provide differential protection during planarization. The protection structures are designed with specific local characteristics (such as varying thickness or material composition in different regions) to prevent dishing effect in critical areas while maintaining manufacturing feasibility, thereby preserving channel dimension precision without excessive process complexity
Data Source
AI summary
A semiconductor structure and a method for forming a semiconductor structure are provided. The semiconductor structure includes a substrate; a gate electrode disposed within the substrate; a gate dielectric layer disposed within the substrate and surrounding the gate electrode; a plurality of first protection structures disposed over the gate electrode; a second protection structure disposed over the gate dielectric layer and contacting the gate dielectric layer; and a pair of source/drain regions on opposing sides of the gate dielectric layer.