Segmented Gate Metal Layer for HEMT Resistance and Breakdown
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Solution Overview
Problem
Conventional high electron mobility transistors (HEMTs) using nitride semiconductors face challenges in achieving optimal electrical performance due to limitations in gate electrode and metal layer configurations, which affect the device's on-state resistance and breakdown voltage.
Innovation Solution
The semiconductor device incorporates a gate metal layer with alternating narrow and wider portions, along with source and drain metal layers, to reduce resistance and enhance breakdown voltage by optimizing the electrical field distribution, and includes a p-type gate layer to improve transconductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gate electrode configuration is used, then the device structure is simple, but the gate resistance is high and breakdown voltage is limited
Solution Approach 1:
The gate metal layer is divided into multiple segments with alternating narrow and wider portions, creating a segmented structure that reduces overall gate resistance while maintaining appropriate spacing for electrical field distribution and breakdown voltage enhancement
Solution Approach 2:
Different portions of the gate metal layer have different widths to create local variations in electrical field distribution, with wider portions providing lower resistance paths and narrow portions maintaining appropriate field spacing for higher breakdown voltage
2Reliability
If the gate metal layer has uniform width, then the manufacturing process is simple, but the electrical field distribution is not optimized
Solution Approach 1:
The gate metal layer incorporates local variations in width with alternating narrow and wider portions, creating optimized electrical field distribution at critical regions while maintaining a relatively simple overall structure that can be fabricated using standard photolithography and metal deposition processes
3Reliability
If a single-layer gate metal configuration is used, then the device structure is simple, but the gate resistance is high
Solution Approach 1:
The gate metal layer is segmented into multiple alternating narrow and wider portions within a single layer, creating multiple parallel current paths that reduce overall gate resistance while maintaining a single-layer configuration that avoids excessive structural complexity
Solution Approach 2:
The gate metal layer extends in the lateral dimension with alternating width variations, creating a two-dimensional patterned structure that reduces resistance through increased effective conduction area without adding vertical layer complexity
Data Source
AI summary
A semiconductor device includes an active layer, a source electrode, a drain electrode, a gate electrode, a first insulating layer, a gate metal layer, a via, a first source metal layer, a drain metal layer, and a second source metal layer. The source electrode, the drain electrode, and the gate electrode are present on the active layer. The first insulating layer is present on the source electrode, the drain electrode, and the gate electrode. The gate metal layer, the first source metal layer, the second source metal layer, and the drain metal layer are present on the first insulating layer. The gate metal layer includes a narrow portion and a wider portion. The via is present between the metal gate layer and the gate electrode. The second source metal layer is present between the gate metal layer and the drain metal layer.