Gate Separation Structure Layout for Reliable Semiconductor Devices
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Solution Overview
Problem
Semiconductor devices face challenges in achieving high reliability and performance while maintaining small size and low power consumption, particularly in field effect transistors, due to complexity and integration density requirements.
Innovation Solution
The semiconductor device incorporates a substrate with active patterns, gate electrodes, separation structures, and gate dielectric patterns, where the top surface of the separation structure is higher than the gate capping pattern, enhancing electrical and reliability characteristics through specific material and layer configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separation structure is made taller to improve electrical characteristics and reliability, then the device complexity and fabrication difficulty increase
Solution Approach 1:
The gate dielectric layer is segmented into two distinct patterns: a first gate dielectric pattern on the gate electrode and a second gate dielectric pattern on the separation structure. This segmentation allows independent optimization of each dielectric region, enabling the separation structure to achieve enhanced electrical characteristics through targeted dielectric engineering without uniformly increasing complexity across the entire device.
Solution Approach 2:
Different gate dielectric patterns are applied to different locations: the first gate dielectric pattern is disposed on the gate electrode while the second gate dielectric pattern is disposed on the separation structure. This local quality approach allows tailored dielectric properties at specific locations, improving reliability where needed (at the separation structure) without unnecessarily complicating other regions.
2Reliability
If the separation structure height is increased to enhance performance, then the manufacturing precision requirements increase
Solution Approach 1:
The gate dielectric patterns are formed prior to final structure assembly, allowing precise control of dielectric layer thickness and composition before the separation structure reaches its final height. This preliminary action enables manufacturing precision to be established early in the process when conditions are more controllable, rather than attempting to achieve precision after the tall separation structure is already formed.
Solution Approach 2:
The gate dielectric patterns serve as intermediary layers between the gate electrode/separation structure and the active pattern. These intermediary dielectric layers provide a buffer that decouples the precise height control of the separation structure from the critical electrical interface, allowing the separation structure to be taller without proportionally increasing manufacturing precision requirements at the critical interfaces.
3Reliability
If additional gate dielectric patterns are added to improve reliability, then the fabrication process complexity increases
Solution Approach 1:
The first and second gate dielectric patterns are formed as part of an integrated gate dielectric structure that is deposited and patterned together in a unified fabrication sequence. By merging the formation of both dielectric patterns into a single coordinated process rather than separate sequential steps, the fabrication complexity is minimized while still achieving the reliability benefits of having distinct dielectric regions at different locations.
Data Source
AI summary
A semiconductor device is provided. The semiconductor device includes a substrate including an active pattern, a gate electrode extending in a first direction and crossing the active pattern which extends in a second direction, a separation structure crossing the active pattern and extending in the first direction, a first gate dielectric pattern disposed on a side surface of the gate electrode, a second gate dielectric pattern disposed on a side surface of the separation structure, and a gate capping pattern covering a top surface of the gate electrode. A level of a top surface of the separation structure is higher than a level of a top surface of the gate capping pattern.