SOI Semiconductor Structure With Charge Trap Layer for RF Crosstalk
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Solution Overview
Problem
In semiconductor-on-insulator (SOI) technology, the interface between the buried oxide layer and the silicon substrate generates parasitic electric fields and charges, leading to harmonic distortion and cross-talk in RF devices due to parasitic surface conduction.
Innovation Solution
A semiconductor structure is designed with a charge trap layer and a charge trap structure formed around the device region of an active layer on an SOI substrate. The charge trap layer, composed of alternately arranged n-type and p-type doped regions, and the charge trap structure, made of trap rich dielectric material, trap and obstruct parasitic charges, reducing their conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If SOI structure is used to reduce parasitic capacitance, then power-speed performance is improved, but parasitic surface conduction occurs due to charge accumulation at the oxide-silicon interface
Solution Approach 1:
A charge trap layer is introduced as an intermediary between the buried oxide layer and the active layer. This charge trap layer captures and holds parasitic charges that would otherwise accumulate at the oxide-silicon interface and create harmful electric fields. The charge trap layer acts as a mediator that prevents the direct interaction between the oxide fixed charges and the silicon substrate, thereby eliminating parasitic surface conduction while preserving the low parasitic capacitance advantage of SOI structures.
Solution Approach 2:
The invention converts the harmful effect of charge accumulation into a beneficial mechanism by deliberately creating a charge trap layer that is designed to capture and immobilize parasitic charges. Instead of allowing charges to accumulate freely at the interface and create harmful electric fields, the charge trap layer provides designated trapping sites that neutralize the harmful effects. The alternately arranged n-type and p-type doped regions create depletion junctions that enhance the charge trapping capability, transforming the parasitic charge problem into a controlled charge management solution.
2Object-generated harmful factors
If charge trap layer with alternately arranged doped regions is formed, then parasitic charge conduction is reduced, but device structure complexity increases
Solution Approach 1:
The charge trap layer is segmented into alternately arranged n-type and p-type doped regions, creating a series of interrupted depletion junctions. This segmentation allows the charge trap layer to function as multiple discrete charge trapping zones rather than a uniform layer. Each doped region segment creates a depletion junction that independently contributes to charge trapping, and the alternating pattern optimizes the electric field distribution to enhance charge capture efficiency while maintaining a manageable structural complexity.
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 implementation of the charge trap layer and structure effectively reduces harmonic distortion and cross-talk in semiconductor devices by preventing parasitic charge accumulation and conduction, thereby enhancing signal transmission characteristics.
Implementation Method 1
a charge trap layer and a charge trap structure formed on an SOI substrate... The charge trap layer and structure effectively reduces harmonic distortion and cross-talk in semiconductor devices by preventing parasitic charge accumulation and conduction
Implementation Method 2
The charge trap layer includes a plurality of n-type first doped regions and a plurality of p-type second doped regions alternately arranged and directly in contact with each other to form a plurality of interrupted depletion junctions
Data Source
AI summary
A semiconductor structure includes a substrate, an insulating layer disposed on the substrate, an active layer disposed on the insulating layer and including a device region, and a charge trap layer in the substrate and extending between the insulating layer and the substrate and directly under the device region. The charge trap layer includes a plurality of n-type first doped regions and a plurality of p-type second doped regions alternately arranged and directly in contact with each other to form a plurality of interrupted depletion junctions.