Semiconductor Gate Contact Segmentation for ESD Protection
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Solution Overview
Problem
Solid-state switches in semiconductor applications face challenges in protecting the gate dielectric from electrostatic discharge events, requiring significant area for ESD protection structures which can compromise area efficiency and increase the risk of damage.
Innovation Solution
A semiconductor device design featuring a transistor structure with a longitudinal gap between the gate and source contact structures, where gate interconnecting structures and electrostatic discharge protection structures are strategically placed to ensure homogeneous gate current distribution and maximize diode width, thereby enhancing ESD protection while optimizing area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ESD protection structures are provided to protect the gate dielectric from electrostatic discharge events, then the reliability of the transistor is improved, but the area occupied within the integrated semiconductor device increases
Solution Approach 1:
The gate contact structure is divided into multiple segments separated by longitudinal gaps, allowing ESD protection structures to be integrated between these segments. This segmentation enables the ESD protection diodes to share the gate contact area rather than requiring separate dedicated space, thus improving reliability without proportionally increasing total area.
Solution Approach 2:
The ESD protection structures are merged with the gate contact structure by placing diodes between the segmented gate contact segments. The gate interconnecting structures serve dual purposes: connecting the gate segments electrically and providing pathways for ESD current to flow through the diodes to the source contact structure, thereby combining protection functionality with existing gate routing.
2Reliability
If the gate contact structure is separated from the source contact structure by a longitudinal gap to accommodate ESD protection structures, then ESD protection capability is enhanced, but the complexity of the device structure increases
Solution Approach 1:
The gate interconnecting structures perform multiple functions simultaneously: they connect the segmented gate contact structures to the gate electrode, provide current pathways for ESD protection, and serve as anchoring points for the ESD protection diodes. This multi-functionality reduces the need for separate dedicated ESD protection pathways, thereby enhancing protection capability while limiting the increase in structural complexity.
3Stability of the object's composition
If gate interconnecting structures are placed between electrostatic discharge protection structures, then homogeneous gate current distribution is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The gate interconnecting structures extend in the lateral dimension across the longitudinal gaps between gate contact segments, creating a two-dimensional routing pattern rather than simple linear connections. This dimensional approach allows current to distribute more uniformly across the gate electrode surface while providing manufacturing tolerance through the extended lateral pathways, balancing homogeneity requirements with manufacturability.
Data Source
AI summary
A semiconductor device includes a semiconductor body having opposite first and second surfaces. The semiconductor device further includes a transistor structure in the semiconductor body and a source contact structure overlapping the transistor structure. The source contact structure is electrically connected to source regions of the transistor structure. A gate contact structure is further provided, which has a part separated from the source contact structure by a longitudinal gap within a lateral plane. Gate interconnecting structures bridge the longitudinal gap and are electrically coupled between the gate contact structure and a gate electrode of the transistor structure. Electrostatic discharge protection structures bridge the longitudinal gap and are electrically coupled between the gate contact structure and the source contact structure. At least one of the gate interconnecting structures is between two of the electrostatic discharge protection structures along a length direction of the longitudinal gap.