Nitride Gate Layer Layout for Current Dispersion and Low Capacitance
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Solution Overview
Problem
Current nitride semiconductor devices face challenges in achieving reliable operation due to local current concentration and parasitic capacitance issues, which affect the gate electrode's reliability and efficiency.
Innovation Solution
The nitride semiconductor device incorporates a gate layer with a main gate portion, a sub gate portion, and a protrusion extending towards the drain opening, along with an interlayer insulating layer and specific gate wiring configurations to reduce current concentration and parasitic capacitance, enhancing the device's operational reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gate electrode structure is used, then the device structure is simple, but local current concentration occurs and parasitic capacitance increases, reducing reliability
Solution Approach 1:
The gate layer is divided into multiple functional segments: a main gate portion for primary current conduction, a sub gate portion extending toward the drain for current dispersion, and a protrusion for parasitic capacitance reduction. This segmentation allows each part to address specific reliability issues while collectively improving overall gate electrode performance.
Solution Approach 2:
Different regions of the gate layer are designed with distinct geometrical properties and functional characteristics. The main gate portion has a larger cross-section for high current capacity, the sub gate portion extends strategically to disperse current density, and the protrusion is positioned to minimize parasitic capacitance effects. This local quality differentiation optimizes reliability without requiring complete structural redesign.
2Reliability
If the gate layer is extended towards the drain opening, then parasitic capacitance is reduced, but the device structure becomes more complex
Solution Approach 1:
The gate layer is designed in advance with pre-positioned extensions and protrusions that proactively address parasitic capacitance issues before they affect device operation. The sub gate portion and protrusion are configured during manufacturing to preemptively reduce capacitive coupling effects, eliminating the need for additional corrective structures or complex wiring configurations.
3Reliability
If current dispersion structures are added, then local current concentration is reduced, but manufacturing complexity increases
Solution Approach 1:
The current dispersion function is merged into the gate layer structure itself through the sub gate portion and protrusion features, rather than requiring separate discrete components or additional manufacturing steps. This integration allows current dispersion to be achieved through standard semiconductor fabrication processes, maintaining ease of manufacture while improving current distribution uniformity.
Data Source
AI summary
A nitride semiconductor device includes: an electron supply layer; a gate layer, a gate electrode; a passivation layer; a source electrode; a drain electrode; an active region; and an inactive region that is adjacent to the active region in a second direction orthogonal to a first direction in plan view. The gate layer includes a main gate part extending in the second direction in the active region, a subgate part extending in the second direction to be continuous with the main gate part in the inactive region, and a protruding part protruding from the subgate part toward a drain opening in the first direction.