ESD Protection Structure for Semiconductor Devices
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Solution Overview
Problem
Semiconductor devices face challenges in providing effective electrostatic discharge (ESD) protection while maintaining thermal characteristics and area efficiency, particularly in automotive and industrial applications where ESD events can damage gate dielectrics, and existing symmetric ESD protection structures are asymmetric in polarity, limiting device testing and robustness.
Innovation Solution
A semiconductor device with an electrostatic discharge protection structure featuring a first terminal region of one conductivity type and a second terminal region of opposite conductivity type, integrated with a terminal shunting structure to provide bidirectional unsymmetrical protection, reducing the chip size and enhancing thermal robustness by dissipating energy from ESD events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a symmetrical electrostatic discharge protection structure is provided between gate and source contact structures, then ESD protection is achieved, but the asymmetric robustness of the device in view of ESD polarity leads to restraints in tests and reduced reliability
Solution Approach 1:
The patent applies asymmetry by providing a first ESD protection structure with a first conductivity type (e.g., n-type) between the gate and source contact structures, and a second ESD protection structure with a second conductivity type (e.g., p-type) between the gate and source contact structures. This asymmetric configuration addresses the inherent polarity asymmetry in ESD events, providing enhanced protection for both positive and negative voltage scenarios while maintaining device robustness and enabling comprehensive testing.
2Reliability
If ESD protection structures are provided to protect the gate dielectric from electrostatic discharge events, then the transistors are protected, but non-negligible area within the integrated semiconductor device is required
Solution Approach 1:
The patent merges the ESD protection function with the existing gate and source contact structures by positioning the first and second ESD protection structures between these contact structures. This integration approach provides comprehensive ESD protection for the gate dielectric while utilizing the available space efficiently, thereby reducing the additional area required compared to separate protection structures.
3Reliability
If existing ESD protection structures are used, then basic protection is provided, but thermal characteristics and area efficiency are compromised
Solution Approach 1:
The patent applies local quality by providing different conductivity types (n-type and p-type) for the first and second ESD protection structures respectively, positioned at specific locations between the gate and source contact structures. This localized differentiation optimizes the protection against both positive and negative ESD events while improving thermal dissipation characteristics and area efficiency compared to uniform protection 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
The solution provides enhanced ESD protection with improved thermal characteristics and area efficiency, effectively handling ESD events between gate and source contacts, and optimizing the ESD protection structure for both positive and negative voltage polarities, thus improving the semiconductor device's robustness and reliability.
Implementation Method 1
a damage of a gate dielectric between gate and source of the transistors may be caused by an electrostatic discharge event between a gate contact area and a source contact area of the semiconductor device
Implementation Method 2
dissipating energy from ESD events
Data Source
AI summary
A semiconductor device includes a semiconductor body having a first surface and a second surface opposite to the first surface. A first isolation layer is provided over the first surface of the semiconductor body. The semiconductor device further includes an electrostatic discharge protection structure over the first isolation layer. The electrostatic discharge protection structure has a first terminal region of a first conductivity type and a second terminal region of a second conductivity type opposite to the first conductivity type.