Semiconductor Trench Layout for Noise-Resistant Breakdown Control
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Solution Overview
Problem
Semiconductor devices face challenges in improving element breakdown resistance due to noise interference and current concentration, particularly in the integration of transistor and diode sections where noise can lead to erroneous triggering and short-circuit conditions.
Innovation Solution
The semiconductor device incorporates a boundary region between the transistor and diode sections, featuring a dummy trench section aligned with gate and emitter trench sections, which increases capacitance between the gate and emitter, reducing noise interference and current concentration by adjusting the ratio of dummy trench sections to gate and emitter trench sections, and optimizing the layout to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If transistor and diode sections are integrated in close proximity to improve device compactness, then productivity and area utilization are improved, but noise interference between sections increases causing erroneous triggering and reduced reliability
Solution Approach 1:
The device is divided into distinct transistor and diode sections with a boundary region separating them. This segmentation allows each section to function independently while maintaining compact integration, reducing noise interference between the two sections.
Solution Approach 2:
A boundary region is introduced as an intermediary structure between the transistor and diode sections. This boundary region acts as a mediator that prevents direct interference between the sections while maintaining their functional integration, thereby improving reliability without sacrificing compactness.
2Power
If current density is increased to improve power output, then power delivery is improved, but current concentration increases leading to hot spots and reduced reliability
Solution Approach 1:
Different regions of the device are designed with different local characteristics. The boundary region has specific structural properties that differ from the active transistor and diode regions, allowing current to be distributed more evenly and preventing localized current concentration that would lead to hot spots.
Solution Approach 2:
The boundary region is designed in advance to prevent current concentration before it can cause damage. By providing a structural buffer zone between the transistor and diode sections, the design preemptively mitigates the risk of hot spot formation and thermal runaway.
3Reliability
If noise suppression measures are added to reduce interference, then reliability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The boundary region performs multiple functions simultaneously: it separates the transistor and diode sections, manages current distribution, and provides noise suppression. By merging these functions into a single structural element, the design achieves improved reliability without proportionally increasing device complexity.
Solution Approach 2:
The boundary region is designed as a multi-functional element that serves as both a structural separator and an electrical management component. It simultaneously provides physical separation, current distribution, and noise filtering, reducing the need for additional dedicated noise suppression structures.
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 enhances breakdown resistance by reducing noise-induced errors and current concentration, ensuring stable operation and preventing device destruction during high current density switching operations.
Implementation Method 1
dummy trench section aligned with gate and emitter trench sections, which increases capacitance between the gate and emitter
Data Source
AI summary
Provided is a semiconductor device having transistor and diode sections. The semiconductor device comprises: a gate metal layer provided above the upper surface of a semiconductor substrate; an emitter electrode provided above the upper surface of the semiconductor substrate; a first conductivity-type emitter region provided on the semiconductor substrate upper surface side in the transistor section; a gate trench section, which is provided on the semiconductor substrate upper surface side in the transistor section, is electrically connected to the gate metal layer, and is in contact with the emitter region; an emitter trench section, which is provided on the semiconductor substrate upper surface side in the diode section, and is electrically connected to the emitter electrode; and a dummy trench section, which is provided on the semiconductor substrate upper surface side, is electrically connected to the gate metal layer, and is not in contact with the emitter region.