Back-Side Field Plates for Higher-Voltage Compound Semiconductors
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Solution Overview
Problem
Existing compound semiconductor devices face challenges in safely driving higher voltages due to peak electric field issues, leading to reliability and performance concerns.
Innovation Solution
The integration of back-side field plates made of conductive or semi-conductive materials, such as GaN, Ge, or Si, within the substrate to modify and shape the electric fields produced by the semiconductor devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If compound semiconductor devices operate at higher voltage levels, then power handling capability is improved, but electric field peaks cause breakdown and reduce reliability
Solution Approach 1:
A conductive layer is introduced as an intermediary element within the substrate to modify the electric field distribution. This conductive layer acts as a mediator that redistributes the electric field lines, reducing peak fields at critical interfaces while enabling higher overall voltage operation, thus allowing improved power handling without sacrificing reliability
Solution Approach 2:
The patent modifies the electric field distribution by changing the electrical parameters of the substrate through the addition of a conductive layer. By altering the conductivity distribution within the substrate, the electric field profile is transformed from a peaked distribution to a more uniform distribution, enabling higher voltage operation while maintaining reliability
2Ease of manufacture
If conventional silicon substrates are used, then manufacturing is simpler, but electric field control and breakdown voltage are limited
Solution Approach 1:
The patent creates a composite substrate structure by integrating a conductive layer within a semiconductor substrate. This composite approach combines the manufacturing advantages of conventional silicon substrates with the enhanced electric field control capabilities of the conductive layer, achieving both ease of manufacture and improved electric field precision
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 breakdown voltage, reduces charge trapping, and improves the transient response and thermal performance of compound semiconductor devices.
Implementation Method 1
The conductive layer can be configured to modify the electric field produced by the semiconductor device
Data Source
AI summary
Integrated circuits can include semiconductor devices with back-side field plates. The semiconductor devices can be formed on substrates that have conductive layers located within the substrates. The conductive layers can include at least one of a conducting material or a semi-conducting material that modifies an electric field produced by the semiconductor devices. The semiconductor devices can include one or more semiconductor layers that include one or more materials having a compound material that includes at least one Group 13 element and at least one Group 15 element.