Semiconductor Contact Structure With Spacer For Electrical Isolation
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Solution Overview
Problem
The increasing demand for high-speed, high-reliability, and multi-functional semiconductor devices has led to complex structures, but existing technologies face challenges in efficiently integrating and manufacturing semiconductor devices with improved contact structures that prevent electrical shorts and enhance integration density.
Innovation Solution
The semiconductor device incorporates a substrate with active patterns, gate electrodes, source/drain regions, and a contact structure featuring first and second contacts with specific geometries and materials, including barrier patterns and conductive patterns, to ensure electrical connectivity while preventing shorts, with the second contact being offset to maintain a minimum distance from the gate contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If contact structures are integrated densely to improve device integration density, then manufacturing efficiency and device performance improve, but the risk of electrical shorts between adjacent contacts increases
Solution Approach 1:
A spacer structure is introduced as an intermediary element between adjacent contact structures. The spacer is positioned on the sidewalls of the first contact and extends to a height that prevents electrical connection between the first contact and the gate contact, thereby eliminating the harmful electrical short while maintaining compact integration
Solution Approach 2:
The solution transitions from a two-dimensional planar separation to a three-dimensional vertical arrangement. The spacer extends vertically along the sidewall of the contact, creating a vertical barrier that prevents electrical shorts without requiring increased horizontal spacing between contacts, thus maintaining high integration density
2Productivity
If the distance between PMOSFET and NMOSFET regions is reduced to improve integration density, then device size decreases and manufacturing efficiency improves, but the risk of electrical interference and shorts increases
Solution Approach 1:
The spacer acts as a physical intermediary barrier between the source/drain region and the gate contact. By positioning the spacer on the contact sidewall and extending it to appropriate height, the design prevents direct electrical contact between oppositely doped regions, eliminating electrical interference while enabling reduced spacing between PMOSFET and NMOSFET regions
3Reliability
If contact structures are designed with complex geometries including multiple contacts and spacers to prevent electrical shorts, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The contact structure is segmented into distinct functional components: a first contact for source/drain connection, a second contact for gate connection, and a spacer for electrical isolation. This segmentation allows each component to be optimized independently while maintaining overall simplicity through standardized formation processes
Solution Approach 2:
The spacer structure serves multiple functions simultaneously: it provides electrical isolation between contacts, defines the lateral boundary of the contact region, and serves as a template for subsequent processing steps. This multi-functionality reduces the need for additional dedicated structures, simplifying the overall design
Data Source
AI summary
A semiconductor device includes a substrate having an active pattern therein, a gate electrode extending across the active pattern and a source/drain region on the active pattern laterally adjacent the gate electrode. The device further includes a contact structure including a first contact on the source/drain region, a second contact on the first contact and a spacer on sidewalls of the first and second contacts.