RF Switch Silicide Layer Spacing for Off-Capacitance Reduction
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Solution Overview
Problem
As semiconductor devices in integrated circuits scale down, the increased density leads to higher fringing and parasitic capacitance in radiofrequency (RF) switch devices, making it difficult to effectively reduce off capacitance and maintain performance specifications.
Innovation Solution
A radiofrequency switch device is designed with a first silicide layer on an epitaxial layer and a second silicide layer in a doped region, increasing the distance between them to reduce capacitance effects, and the manufacturing method involves forming these layers in specific configurations to achieve this reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If components in the RF switch device are scaled down to increase device density, then device integration is improved, but off capacitance increases due to higher fringing and parasitic capacitance
Solution Approach 1:
The patent applies dimensionality change by forming the first silicide layer on the epitaxial layer (above the semiconductor layer) and the second silicide layer in the doped region (within the semiconductor layer), creating a vertical separation that increases the distance between silicide layers and reduces capacitance in the vertical dimension
Solution Approach 2:
The epitaxial layer serves as an intermediary structure between the first doped region and the first silicide layer, providing physical separation and reducing the capacitance coupling between the silicide layers while maintaining device functionality
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 solution effectively reduces off capacitance in RF switch devices, addressing the scaling challenges and maintaining performance specifications by minimizing fringing and parasitic capacitance.
Implementation Method 1
The capacitance effect between the first silicide layer and the second silicide layer may be reduced accordingly, and the purpose of reducing the off capacitance of the RF switch device may be achieved
Data Source
AI summary
A radiofrequency switch device includes an insulation layer, a semiconductor layer, a gate structure, a first doped region, a second doped region, an epitaxial layer, a first silicide layer, and a second silicide layer. The semiconductor layer is disposed on the insulation layer. The gate structure is disposed on the semiconductor layer. The first doped region and the second doped region are disposed in the semiconductor layer at two opposite sides of the gate structure respectively. The epitaxial layer is disposed on the first doped region. The first silicide layer is disposed on the epitaxial layer. The second silicide layer is disposed in the second doped region.