Semiconductor Interconnect Air-Gap Isolation for Lower RC Delay
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Solution Overview
Problem
As semiconductor devices evolve with smaller dimensions and increased density, the reduced spacing between conductive features leads to increased capacitance, resulting in higher power consumption and longer resistive-capacitive time constants, posing challenges for efficient performance and energy management.
Innovation Solution
The semiconductor device structure incorporates a surrounding structure with air gaps and specific spacer layers to reduce capacitive coupling between conductive features, achieved through a series of manufacturing stages involving dielectric material deposition, spacer layer formation, and sacrificial layer removal, creating an air gap with a low dielectric constant to isolate conductive structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the distance between conductive features is reduced to increase density, then the device density increases, but the capacitance between conductive features increases
Solution Approach 1:
The patent introduces an intermediary dielectric material with low dielectric constant (k-value) between adjacent conductive features. This intermediary layer acts as a mediator that reduces the capacitive coupling between conductors while allowing them to remain in close proximity, thus enabling high density without proportionally increasing capacitance.
Solution Approach 2:
The patent changes the dielectric parameter (k-value) of the insulating material between conductive features. By selecting and using dielectric materials with lower k-values, the patent reduces the capacitance between adjacent conductors while maintaining their close spacing, thereby resolving the contradiction between density and capacitance.
2Quantity of substance
If the distance between conductive features is reduced to increase density, then the device density increases, but the power consumption increases
Solution Approach 1:
The low-k dielectric material serves as an intermediary that reduces capacitive coupling between densely packed conductive features. By minimizing the capacitance through this intermediary layer, the patent reduces the energy lost to capacitive charging and discharging, thereby lowering power consumption while maintaining high device density.
Solution Approach 2:
The patent changes the dielectric constant parameter of the insulating material to a lower value, which directly reduces the capacitance between adjacent conductors. This parameter change reduces the RC time constant and associated power consumption, enabling high-density designs with acceptable power characteristics.
3Quantity of substance
If the distance between conductive features is reduced to increase density, then the device density increases, but the resistive-capacitive time constant increases
Solution Approach 1:
The patent changes the dielectric constant parameter of the insulating material to a lower value, which directly reduces the capacitance component of the RC time constant. By using low-k dielectric materials, the patent reduces the overall RC time constant even as conductor spacing is reduced, thereby maintaining signal speed and reducing delay in high-density configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces capacitive coupling between neighboring conductive structures, leading to improved energy efficiency and performance by minimizing power consumption and RC time constants.
Implementation Method 1
the resulting capacitance (a function of the dielectric constant (k value) of the insulating material divided by the distance between the conductive features) increases
Implementation Method 2
the dielectric constant (k value) of the insulating material
Data Source
AI summary
A semiconductor device structure, along with methods of forming such, are described. The semiconductor device structure includes a device, a first dielectric material disposed over the device, and an opening is formed in the first dielectric material. The semiconductor device structure further includes a conductive structure disposed in the opening, and the conductive structure includes a first sidewall. The semiconductor device structure further includes a surrounding structure disposed in the opening, and the surrounding structure surrounds the first sidewall of the conductive structure. The surrounding structure includes a first spacer layer and a second spacer layer adjacent the first spacer layer. The first spacer layer is separated from the second spacer layer by an air gap.