AlGaN Semiconductor Layout for Drain-Side Trap Suppression
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Solution Overview
Problem
Semiconductor devices face instability and current collapse due to high electric fields, leading to changes in characteristics and increased on-resistance, particularly at the drain electrode, where trap generation is common.
Innovation Solution
The semiconductor device incorporates a second semiconductor region with distinct fluorine concentrations in different regions, where a higher fluorine concentration in the first region near the drain electrode suppresses trap generation, and a lower or zero fluorine concentration in the second region to maintain stable characteristics and reduce on-resistance, achieved through selective introduction of fluorine using masks or insulating films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine is introduced into the semiconductor region near the drain electrode to suppress trap generation, then reliability is improved, but on-resistance increases
Solution Approach 1:
The patent applies local quality by introducing fluorine only in specific regions (first and second regions near the drain electrode) while maintaining other regions (third and fourth regions) without fluorine or with different fluorine concentrations. This localized approach suppresses trap generation at the drain where high electric fields cause instability, while preserving low on-resistance in other critical areas of the semiconductor device.
Solution Approach 2:
The semiconductor region is divided into multiple segments (first, second, third, and fourth regions) with different fluorine concentration profiles. The first region has high fluorine concentration to suppress traps, the second region has moderate fluorine concentration, the third region has low or zero fluorine concentration, and the fourth region has controlled fluorine concentration. This segmentation allows simultaneous optimization of reliability and on-resistance by tailoring fluorine distribution to specific functional requirements of each region.
2Power
If high electric field is applied to improve device performance, then power handling capability is improved, but trap generation increases causing characteristic changes
Solution Approach 1:
The patent applies preliminary anti-action by pre-introducing fluorine into the semiconductor regions before the device operates under high electric field conditions. The fluorine atoms are positioned in advance to prevent trap formation that would otherwise occur during high-power operation. This preemptive措施 counteracts the harmful effects of high electric fields before they can cause characteristic changes and reliability degradation.
Solution Approach 2:
Fluorine is introduced selectively in the first and second regions where high electric fields are most intense and trap generation is most problematic. The third and fourth regions maintain different fluorine concentrations optimized for their specific functions. This localized quality enhancement allows the device to handle high power while maintaining characteristic stability in the critical high-field regions.
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 configuration stabilizes the device characteristics and reduces on-resistance by suppressing trap generation and electric field-induced instability, maintaining performance even under high voltage stress.
Implementation Method 1
a higher fluorine concentration in the first region near the drain electrode suppresses trap generation
Data Source
AI summary
According to one embodiment, a semiconductor device includes a first electrode, a second electrode, a third electrode, a first semiconductor region, and a second semiconductor region. The first to third electrodes extend in the first direction. A second direction from the first electrode to the second electrode is perpendicular to the first direction. The first semiconductor region includes Alx1Ga1−x1N (0≤x1<1). The first semiconductor region includes first to fifth partial regions. A third direction from the first partial region to the first electrode crosses a plane including the first and second directions. A direction from the second partial region to the second electrode, and a direction from the third partial region to the third electrode are along the third direction. The second semiconductor region includes Alx2Ga1−x2N (0<x2<1, x1<x2). The second semiconductor region includes first and second semiconductor portions.