Concave Dielectric Spacer in Contact Structures for Short-Circuit Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As semiconductor devices miniaturize, undesired short-circuits between conductive features become a significant issue due to the close proximity of contact structures and conductive elements, leading to reliability and performance concerns.
Innovation Solution
A semiconductor structure is designed with a dielectric spacer having a concave surface that separates the contact structure from the conductive element, creating a larger distance between them and preventing short-circuits, while also allowing for increased contact area and reduced resistance through its network structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor devices are miniaturized to achieve high performance, then device size is reduced and performance is improved, but the risk of short-circuit between conductive features increases
Solution Approach 1:
A dielectric spacer structure is introduced as an intermediary element between the contact structure and the conductive element. This spacer creates a physical barrier and increases the spacing distance, preventing direct contact and potential short-circuits while allowing the device to maintain miniaturized dimensions for high performance
Solution Approach 2:
The dielectric spacer extends the separation in the vertical dimension (z-direction) rather than solely relying on lateral spacing. By creating a multi-layer structure with the spacer positioned between the contact and conductive element, the design achieves effective isolation while maintaining compact lateral footprints
2Reliability
If the distance between contact structure and conductive element is increased to prevent short-circuit, then reliability is improved, but device area increases
Solution Approach 1:
The spacing is achieved primarily in the vertical dimension through the dielectric spacer layers rather than increasing lateral distances. This allows effective electrical isolation to be achieved without proportionally increasing the device footprint area
Solution Approach 2:
The dielectric spacer structure utilizes composite dielectric materials (such as silicon nitride and silicon oxide layers) that provide both electrical isolation and structural support, enabling effective spacing with optimized material usage and minimal area occupation
3Ease of manufacture
If conventional planar dielectric spacer is used, then manufacturing is simple, but spacing effectiveness and manufacturing tolerance are limited
Solution Approach 1:
The dielectric spacer incorporates a concave curved surface instead of a planar interface. This curvature provides a self-aligning feature that enhances manufacturing tolerance and ensures consistent spacing between the contact structure and conductive element, improving precision while remaining compatible with standard fabrication processes
Solution Approach 2:
The dielectric spacer structure utilizes controlled thickness variations and curvature parameters to optimize both the spacing effectiveness and manufacturing tolerance. By carefully controlling the concave surface geometry and layer thicknesses, the design achieves precise spacing control that accommodates normal manufacturing variations
Data Source
AI summary
The present disclosure provides a semiconductor structure. The semiconductor structure includes a semiconductor substrate, a contact structure, a first conductive element, and a first dielectric spacer structure. The semiconductor substrate includes an active region and an isolation structure. The contact structure is on the active region of the semiconductor substrate. The first conductive element is on the isolation structure of the semiconductor substrate. The first dielectric spacer structure is between the contact structure and the first to conductive element. The first dielectric spacer structure has a first concave surface facing the first conductive element.