Semiconductor Isolation Structures for Transistor Integration
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Solution Overview
Problem
Semiconductor technology faces challenges in effectively isolating different types of transistors on the same semiconductor substrate, such as higher voltage and lower voltage transistors, to reduce cost and complexity while maintaining device performance.
Innovation Solution
The implementation of a semiconductor structure that uses isolation structures like dielectric platforms with air gaps or filled trenches, which provide electrical isolation and reduce parasitic capacitance, allowing for the integration of higher voltage and lower voltage transistors on the same substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If higher voltage and lower voltage transistors are integrated on the same semiconductor substrate, then device integration and cost are improved, but electrical isolation between transistors becomes difficult to achieve
Solution Approach 1:
The patent divides the semiconductor substrate into distinct regions separated by isolation structures. These isolation structures segment the continuous substrate into isolated zones where higher voltage and lower voltage transistors can coexist without electrical interference, effectively solving the isolation problem while maintaining integration.
Solution Approach 2:
The patent introduces isolation structures as intermediary elements between higher voltage and lower voltage transistors. These intermediate structures provide the necessary electrical isolation while allowing both transistor types to function on the same substrate, acting as mediators that enable coexistence without direct electrical contact.
2Reliability
If isolation structures are implemented to separate transistors, then electrical isolation is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The isolation structures serve multiple functions simultaneously: they provide electrical isolation between transistors, reduce parasitic capacitance, and enable higher frequency operation. By making the isolation structures multi-functional, the patent reduces the need for additional separate components or structures, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The patent combines several functions into the isolation structures themselves. Rather than having separate elements for isolation, capacitance reduction, and frequency control, these functions are merged into the isolation structure design, simplifying the overall device architecture despite the added isolation requirement.
3Speed
If isolation structures are used to reduce parasitic capacitance, then frequency of operation is improved, but manufacturing complexity increases
Solution Approach 1:
The isolation structures are formed during the preliminary stages of semiconductor manufacturing, before the transistor fabrication is completed. By establishing the isolation structures early in the process, the patent enables subsequent transistor fabrication to proceed without additional complexity, as the isolation framework is already in place to guide further manufacturing steps.
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 enhances the integration of transistors by reducing parasitic capacitance, increasing the frequency of operation, and improving the quality of passive devices, while maintaining the performance of both higher voltage and lower voltage transistors.
Implementation Method 1
isolation structures like dielectric platforms with air gaps or filled trenches, which provide electrical isolation and reduce parasitic capacitance
Data Source
AI summary
In various embodiments, semiconductor structures and methods to manufacture these structures are disclosed. In one embodiment, a method includes forming a portion of the unidirectional transistor and a portion of a bidirectional transistor in or over a semiconductor material simultaneously. Other embodiments are described and claimed.