RF Chip Substrate with Amorphous Buried Layer for Parasitic Current Control
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Solution Overview
Problem
Current radiofrequency components face challenges in reducing parasitic currents and manufacturing efficiency, particularly in the design and integration of semiconductor substrates for radiofrequency integrated circuit chips.
Innovation Solution
The integration of an amorphous buried layer and insulating structures, such as PN junctions, within the semiconductor substrate to delimit active regions and form interconnection networks, which helps in reducing parasitic currents and improving manufacturing processes by ion implantation and substrate thinning techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductor substrate designs are used for radiofrequency components, then manufacturing processes are simpler, but parasitic currents increase and manufacturing efficiency decreases
Solution Approach 1:
The semiconductor substrate is segmented into distinct functional layers: an amorphous buried layer at the bottom, a crystalline active region in the middle, and insulating structures at the sides. This segmentation allows each layer to be optimized independently - the amorphous layer provides high impedance to block parasitic currents while the crystalline region maintains device performance, thus reducing parasitic currents without excessively complicating the overall manufacturing process
Solution Approach 2:
Different regions of the substrate are given different material properties: the buried layer uses amorphous material with high electrical impedance specifically where needed to block parasitic currents, while the active region uses crystalline material for optimal device operation. This local differentiation of material quality allows parasitic current reduction in specific areas without affecting the performance of the active radiofrequency components
2Reliability
If amorphous buried layer and insulating structures are integrated into the semiconductor substrate, then parasitic currents are reduced, but manufacturing process complexity increases
Solution Approach 1:
The amorphous buried layer is formed first in the substrate before the active region is created. This preliminary action establishes the high-impedance foundation that will later block parasitic currents. By performing this step beforehand, the subsequent formation of the active region and insulating structures becomes more straightforward, as the impedance-blocking function is already in place
Solution Approach 2:
The structure is organized in a nested manner where the amorphous buried layer is embedded within the substrate, the active region is formed on top of it, and insulating structures are integrated at the interfaces. This nested arrangement allows multiple functional elements to be combined in a systematic way that manages manufacturing complexity while achieving the desired parasitic current reduction
3Productivity
If independent control over the depth of amorphous buried layer and insulating structures is provided, then manufacturing efficiency is enhanced, but device complexity increases
Solution Approach 1:
The manufacturing process is made dynamic by allowing independent adjustment of the depth of the amorphous buried layer and the position of the insulating structures. This means the depths and positions are not fixed but can be optimized for different device requirements, enabling flexible manufacturing that adapts to various performance needs while maintaining a systematic process framework
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 parasitic currents and enhances the manufacturing efficiency of radiofrequency components by increasing impedance and providing independent control over the depth of the amorphous buried layer and insulating structures, thus improving the performance and reliability of radiofrequency integrated circuit chips.
Implementation Method 1
increasing impedance and providing independent control over the depth of the amorphous buried layer
Implementation Method 2
the step of forming of the amorphous buried layer is carried out by ion implantation
Data Source
AI summary
The present description concerns an integrated circuit chip including a semiconductor substrate and a radiofrequency component arranged inside and on top of an active region of the semiconductor substrate. The semiconductor substrate includes an amorphous buried layer in contact, by its upper surface, with a lower surface of the active region of the semiconductor substrate.