Nitride Semiconductor Gate Clamping for Overvoltage Reliability
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Solution Overview
Problem
Existing semiconductor devices face challenges in increasing reliability, particularly in environments with varying voltages and frequencies, due to the limitations of direct bandgap semiconductors like group III-V materials.
Innovation Solution
A semiconductor device is designed with a substrate, multiple nitride semiconductor layers, a switching element, a capacitor, and a clamping element. The clamping element is electrically connected to the switching element and is adjacent to the capacitor, forming a protection circuit that helps in dispelling electrons from the gate node of the transistor when the voltage exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If direct bandgap semiconductors (group III-V materials) are used, then the semiconductor components can operate under a variety of conditions (different voltages and frequencies), but the reliability of the semiconductor components is insufficient
Solution Approach 1:
A protection circuit is introduced as an intermediary between the switching element and the external environment. This protection circuit includes a clamping element and a capacitor that work together to absorb voltage spikes and protect the transistor from overvoltage damage, thereby improving reliability while maintaining the versatility of the direct bandgap semiconductor
Solution Approach 2:
The protection circuit is designed to anticipate and prevent potential damage before it occurs. The capacitor is pre-charged and the clamping element is positioned to activate when voltage exceeds safe thresholds, providing beforehand cushioning against voltage spikes and improving component reliability without limiting operational flexibility
2Reliability
If a protection circuit is added to improve reliability, then the transistor is protected from overvoltage damage, but the device complexity increases
Solution Approach 1:
The protection circuit components (clamping element and capacitor) are merged into a compact integrated structure that shares physical space and electrical pathways with the existing switching element. This merging approach provides comprehensive protection while minimizing the increase in overall device complexity and footprint
Data Source
AI summary
The present disclosure provides a semiconductor device and a fabrication method thereof. The semiconductor device includes: a substrate (120); a first nitride semiconductor layer (130) on the substrate (120); a second nitride semiconductor layer (140) on the first nitride semiconductor layer (130) and having a band gap greater than a band gap of the first semiconductor layer (130); a transistor (14) on the second nitride semiconductor layer (140); and a protection circuit (40) on the second nitride semiconductor layer (140), wherein the protection circuit (40) is configured to dispel electrons from a gate node of the transistor (14) when a voltage on the gate node exceeds a first threshold voltage.