Dielectric Caps on Semiconductor Contacts for Isolation
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Solution Overview
Problem
As semiconductor devices, such as high-performance processors, experience reduced yield due to inadvertent electrical connections between adjacent transistors as their size and spacing decrease, making it challenging to avoid electrical shorts during fabrication.
Innovation Solution
A method for fabricating semiconductor devices involves forming dielectric caps on conductive contacts to prevent electrical connections between source/drain regions and gate structures, using a series of dielectric and conductive layers with voided regions to create isolated contacts, ensuring proper electrical connections while avoiding shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transistor size and spacing are decreased to increase transistor density, then productivity is improved, but the risk of inadvertent electrical connections increases, worsening reliability
Solution Approach 1:
A dielectric cap is introduced as an intermediary layer between the source/drain contact and the gate contact. This dielectric cap acts as a mediator that prevents direct electrical contact between the source/drain region and the gate structure, thereby eliminating the risk of inadvertent electrical connections while allowing continued miniaturization of transistor dimensions
2Reliability
If dielectric caps are formed on contacts to prevent electrical shorts, then reliability is improved, but device complexity increases
Solution Approach 1:
The formation of the dielectric cap is merged with the existing interlayer dielectric deposition process. The dielectric material is deposited conformally over the entire surface including the source/drain contacts and gate structures in a single continuous process step, rather than as a separate additional step, thereby minimizing the increase in fabrication complexity
Data Source
AI summary
Semiconductor device structures are provided. An exemplary semiconductor device structure includes a substrate of a semiconductor material and a gate structure overlying the substrate. The semiconductor substrate further includes a doped region formed in the substrate proximate the gate structure and a first dielectric material overlying the doped region. The semiconductor substrate also includes a conductive contact formed in the first dielectric material, the conductive contact being electrically connected to the doped region, and a dielectric cap overlying the conductive contact.