Semiconductor Gate Pad Layout for Plasma Charge Discharge
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Solution Overview
Problem
Plasma-induced gate dielectric damage, commonly known as the antenna effect, causes yield and reliability issues in advanced semiconductor devices by damaging transistor gates and gate dielectric materials during fabrication.
Innovation Solution
A semiconductor structure design incorporating a discharge structure and a fuse structure, where the discharge structure is embedded in a dummy area of the substrate and connected to a multi-layer interconnection metal layer, allowing charges generated during plasma processing to be discharged to the substrate, thereby protecting critical areas from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plasma operations are used in semiconductor fabrication, then manufacturing capability and process integration are improved, but plasma-induced gate dielectric damage (antenna effect) occurs causing yield and reliability deterioration
Solution Approach 1:
The patent introduces an intermediary discharge structure positioned between the plasma processing region and the sensitive gate dielectric. This discharge structure acts as a mediator that safely dissipates plasma-induced charges through controlled discharge paths, preventing charge accumulation that would otherwise damage the gate dielectric. The intermediary structure enables continued use of plasma operations while protecting the sensitive components.
Solution Approach 2:
The patent converts the harmful plasma-induced charges into a beneficial controlled discharge process. By providing dedicated discharge structures with controlled impedance paths, the harmful charge accumulation is transformed into a useful charge dissipation mechanism. The previously harmful antenna effect is converted into a controlled electrical discharge that protects the gate dielectric while maintaining plasma processing effectiveness.
2Reliability
If discharge structures are added to prevent antenna effects, then device reliability is improved, but structure complexity increases
Solution Approach 1:
The patent segments the discharge protection function into separate, modular discharge structures that are distributed throughout the interconnection layout. Rather than requiring a complex integrated protection system, the functionality is divided into discrete discharge paths and structures that can be independently designed and implemented. This segmentation reduces overall system complexity while maintaining comprehensive protection coverage.
Solution Approach 2:
The discharge structures are designed to serve multiple functions simultaneously: they provide antenna effect protection, serve as interconnection elements, and can function as part of the overall circuit logic. By making the discharge structures multi-functional, the patent reduces the need for separate dedicated protection components, thereby reducing overall device complexity while maintaining reliability improvements.
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 design effectively prevents plasma-induced damage to sensitive transistor components by efficiently draining off charges, reducing parasitic capacitance and leakage current, thus enhancing device performance and reliability.
Implementation Method 1
the discharge structure is embedded in a dummy area of the substrate and connected to a multi-layer interconnection metal layer, allowing charges generated during plasma processing to be discharged to the substrate
Data Source
AI summary
A semiconductor structure includes a substrate, an active component, at least one discharge structure, a gate pad, a multi-layer interconnection metal layer, and a fuse structure. The substrate has an active area and a dummy area. The active component is disposed in the active area of the substrate. The discharge structure is disposed in the dummy area of the substrate. The gate pad is disposed above the active component and the discharge structure. The multi-layer interconnection metal layer is disposed above the substrate and disposed between the gate pad and the discharge structure and the gate pad, in which the active component is electrically connected to the gate pad through the multi-layer interconnection metal layer. The fuse structure has separate first and second portions, the first portion is connected to the multi-layer interconnection metal layer, and the second portion is connected to the discharge structure.