Epitaxial Structures in Wide Gate Pitch RF Devices
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Solution Overview
Problem
Forming epitaxial structures in wide gate pitch regions for RF semiconductor devices is challenging due to the pattern loading effect, leading to non-uniformity in thickness and composition, which affects device performance.
Innovation Solution
The method involves forming active pillars between gate stacks in the semiconductor device, creating cavities with uniform dimensions to grow epitaxial structures, which reduces the pattern loading effect and ensures uniformity in epitaxial material growth, and a contact structure is positioned equidistant from the gate stacks to minimize parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If epitaxial structures are formed in wide gate pitch regions, then parasitic capacitance is reduced, but non-uniformity in thickness and composition occurs due to pattern loading effect
Solution Approach 1:
The wide gate pitch region is divided into multiple cavities by forming active pillars between gate stacks. This segmentation creates discrete growth zones with controlled dimensions, allowing uniform epitaxial growth in each cavity while maintaining the overall wide pitch for reduced parasitic capacitance.
Solution Approach 2:
Different regions are created with distinct properties: cavities provide controlled local growth environments for uniform epitaxial structures, while the overall wide gate pitch region maintains low pattern density for reduced parasitic capacitance. The active pillars create localized high pattern density areas that guide uniform growth without affecting the global parasitic characteristics.
2Object-affected harmful factors
If contact structures are positioned far from gate stacks, then parasitic capacitance is reduced, but device area increases
Solution Approach 1:
The contact structure is positioned in the vertical dimension above the active pillar, rather than being laterally displaced. This three-dimensional arrangement allows the contact to be electrically connected to the epitaxial region while maintaining compact lateral dimensions, thus reducing parasitic capacitance without increasing device footprint.
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 results in substantially uniform epitaxial structures with reduced parasitic capacitance, enhancing the performance of RF semiconductor devices by improving switching speed and reducing signal losses at high frequencies.
Implementation Method 1
cavities are formed in the active region... Substantially uniform epitaxial structures are formed positioned adjacent to the active pillar in the active region
Data Source
AI summary
A semiconductor device is provided, which includes an array of active regions, gate stacks and substantially uniform epitaxial structures. The gate stacks of the array include a first gate stack and a second gate stack over an active region. An active pillar between the first gate stack and the second gate stack, and the active pillar separating two substantially uniform epitaxial structures. A contact structure over the active pillar, positioned equidistant from the first gate stack and the second gate stack.