Air Gap Structures Reduce Parasitic Capacitance in Semiconductor Devices
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Solution Overview
Problem
The miniaturization of semiconductor devices leads to increased complexity and parasitic capacitance between conductive elements, resulting in higher power consumption and signal delay, necessitating an improvement in manufacturing processes to reduce these issues.
Innovation Solution
A semiconductor device structure is developed with air gap structures between conductive contacts, formed by energy removable layers that transform into air gap structures during a heat treatment process, separated by dielectric layers to reduce parasitic capacitance and provide structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semiconductor devices are miniaturized to provide greater functionality and integration, then device functionality and integration are improved, but parasitic capacitance between adjacent conductive elements increases
Solution Approach 1:
The patent introduces air gap structures that segment the continuous dielectric medium into isolated regions. These air gaps act as physical separators between adjacent conductive elements (such as bit lines and word lines), breaking the capacitive coupling path and reducing parasitic capacitance while maintaining device miniaturization and integration benefits
2Productivity
If device size is reduced to increase integration, then integration density is improved, but power consumption increases due to higher parasitic capacitance
Solution Approach 1:
Air gap structures segment the dielectric regions between conductive elements, reducing capacitive coupling. This segmentation lowers the parasitic capacitance that must be charged and discharged during device operation, thereby reducing dynamic power consumption while maintaining high integration density
Solution Approach 2:
The air gap structures create porous or void regions within the dielectric layers. These air-filled spaces have lower dielectric constants compared to solid dielectric materials, effectively reducing the parasitic capacitance between adjacent conductive lines and decreasing the energy required for signal transitions
3Productivity
If conductive elements are placed closer together to increase integration, then integration is improved, but signal delay increases due to RC effects
Solution Approach 1:
By segmenting the dielectric continuous phase with air gap structures, the patent reduces the capacitive component of the RC time constant. The air gaps create isolated capacitive regions with reduced coupling, allowing signals to propagate faster between closely spaced conductive elements and reducing overall signal delay
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
The air gap structures effectively decrease parasitic capacitance, enhancing device performance by reducing power consumption and signal delay, and increasing the yield rate of semiconductor devices.
Implementation Method 1
formed by energy removable layers that transform into air gap structures during a heat treatment process
Data Source
AI summary
The present disclosure provides a semiconductor device structure with an air gap structure and a method for forming the semiconductor device structure. The semiconductor device structure includes a first conductive contact and a second conductive contact disposed over a semiconductor substrate. The semiconductor device structure also includes a first dielectric layer surrounding the first conductive contact and the second conductive contact, and a second dielectric layer disposed over the first conductive contact, the second conductive contact and the first dielectric layer. The first dielectric layer is separated from the semiconductor substrate by a first air gap structure, the first dielectric layer is separated from the second dielectric layer by a second air gap structure, and the air gap structures reduce capacitive coupling between conductive features.