Semiconductor Device with Monolithic PN Junctions for ESD Energy Dissipation
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Solution Overview
Problem
Semiconductor devices face challenges in efficiently dissipating energy during high-speed switching off of inductive loads or electrostatic discharge events, leading to potential overstress and device destruction due to mismatched turn-on behaviors among semiconductor elements.
Innovation Solution
The semiconductor device design incorporates a first and second pn junction with temperature coefficients of breakdown voltages that have the same algebraic sign, ensuring 0.6×α1<α2<1.1×α1 at 300K, allowing for monolithic integration and strategic coupling of semiconductor elements to manage energy dissipation effectively during electrostatic discharge events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If semiconductor components are designed to dissipate energy during high-speed switching or electrostatic discharge events, then energy dissipation capability is improved, but turn-on behavior control becomes more complex to ensure proper current absorption distribution
Solution Approach 1:
The patent applies parameter changes by carefully controlling the breakdown voltage relationship between two pn junctions. Specifically, one pn junction is designed with a breakdown voltage that is lower than the other, creating a predetermined voltage threshold that determines which semiconductor element activates first during energy dissipation events. This parameter-based control mechanism simplifies the turn-on behavior coordination without requiring complex control circuits.
2Reliability
If breakdown voltage of one pn junction is made lower than the other for controlled energy absorption, then current absorption control is improved, but voltage distribution uniformity deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the energy dissipation function into two distinct semiconductor elements, each with a dedicated pn junction. The first pn junction is designed with a lower breakdown voltage to handle normal energy dissipation events, while the second pn junction with higher breakdown voltage serves as a backup or overload protection mechanism. This segmentation allows controlled current absorption distribution while maintaining overall system reliability.
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 design enhances the reliability of energy dissipation by ensuring that the appropriate semiconductor element absorbs discharge current, reducing the risk of overstress and improving the semiconductor device's operational safety and efficiency during high-speed switching and electrostatic discharge events.
Implementation Method 1
A temperature coefficient α1 of a breakdown voltage Vbr1 of the first pn junction and a temperature coefficient α2 of a breakdown voltage Vbr2 of the second pn junction have a same algebraic sign and satisfy 0.6×α1<α2<1.1×α1 at T=300K, wherein Vbr2>Vbr1.
Data Source
AI summary
A semiconductor device includes a first semiconductor element including a first pn junction between a first terminal and a second terminal. The semiconductor device further includes a semiconductor element including a second pn junction between a third terminal and a fourth terminal. The semiconductor element further includes a semiconductor body including the first semiconductor element and the second semiconductor element monolithically integrated. The first and third terminals are electrically coupled to a first device terminal. The second and fourth terminals are electrically coupled to a second device terminal. A temperature coefficient α1 of a breakdown voltage Vbr1 of the first pn junction and a temperature coefficient α2 of a breakdown voltage Vbr2 of the second pn junction have a same algebraic sign and satisfy 0.6×α1<α2<1.1×α1 at T=300 K, wherein Vbr2<Vbr1.