Staggered Gate ESD Structures for Reduced Capacitance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrostatic discharge (ESD) structures in semiconductor devices have high capacitance, which increases the susceptibility of miniaturized integrated circuits to damage from ESD events due to thinner dielectric materials and lowered breakdown voltages.
Innovation Solution
The implementation of staggered or cut gate structures over fin structures in N+ and P+ regions, disrupting the electrical path to reduce capacitance, achieved through fabrication processes involving deposition, photolithography, and etching techniques, specifically forming transverse cuts or staggering gate structures along their longitudinal direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESD structures are used, then ESD protection function is provided, but capacitance is inherently large which affects protected devices
Solution Approach 1:
The gate structure is divided into multiple discrete gate segments separated by gaps, rather than forming a continuous gate. This segmentation reduces the overlapping area between gate and drain, thereby reducing capacitance while maintaining ESD protection functionality through distributed protection points
Solution Approach 2:
Portions of the gate structure are removed or cut to create gaps, extracting material that would otherwise contribute to capacitance. The removed gate sections are strategically positioned to reduce capacitive coupling between gate and drain while preserving the essential ESD protection path
2Productivity
If miniaturization is pursued to reduce device size and power consumption, then functional density increases, but susceptibility to ESD events increases due to thinner dielectric materials
Solution Approach 1:
The segmented gate structure reduces capacitance effects that become more problematic in miniaturized devices, allowing ESD protection to remain effective even with thinner dielectric materials while maintaining high functional density through compact layout
Solution Approach 2:
The ESD protection structure uses locally optimized doping regions (N+ and P+ regions) positioned at specific locations to provide enhanced ESD protection precisely where needed in the miniaturized device, rather than uniform protection throughout
Data Source
AI summary
The present disclosure relates to semiconductor structures and, more particularly, to electrostatic discharge structures with reduced capacitance and methods of manufacture. The structure includes: a plurality of fin structures provided in at least one N+ type region and at least one P+ region; and a plurality of gate structures disposed over the plurality of fin structures and within the at least one N+ type region and one P+ region, the plurality of gate structures being separated in a lengthwise direction between the at least one N+ type region and the least one P+ region.