Backside Inductive Coating for Semiconductor ESD Protection
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Solution Overview
Problem
The accumulation of charge during the assembly process of semiconductor devices can lead to electrostatic discharge (ESD) events, damaging the circuitry and reducing the yield or durability of the semiconductor device assembly.
Innovation Solution
A semiconductor device assembly with an inductive coating applied directly to the backside of the semiconductor substrate to reduce charge accumulation by enabling slow dissipation of charge and opposing electron transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional packaging processes are used without ESD mitigation features, then cost is reduced, but charge accumulation occurs leading to ESD events and circuitry damage
Solution Approach 1:
The inductive coating is applied to the backside of the semiconductor substrate before packaging operations to proactively prevent charge accumulation. This preliminary protective measure eliminates the need for costly ESD mitigation features in subsequent packaging materials, resolving the contradiction between reliability and manufacturing cost.
Solution Approach 2:
The inductive coating acts as an intermediary layer between the semiconductor substrate and the packaging environment. It mediates the interaction by providing ESD protection through its inductive properties, allowing the use of cost-sensitive packaging materials without compromising device reliability.
2Reliability
If ionizer fans and discharge tools are used to reduce charge accumulation, then ESD protection is improved, but operation time and process complexity increase
Solution Approach 1:
The inductive coating provides self-service ESD protection by inherently dissipating charge through its inductive properties. This eliminates the need for external ionizer fans and discharge tools, reducing both operation time and process complexity while maintaining effective charge dissipation.
Solution Approach 2:
The ESD protection function is extracted from external tools (ionizer fans, discharge tools) and integrated directly into the substrate through the inductive coating. This extraction eliminates the time-consuming discharge operations while maintaining protection effectiveness.
3Reliability
If improved indirect materials (IDMs) with ESD mitigation features are used, then charge accumulation is reduced, but manufacturing cost and vendor dependency increase
Solution Approach 1:
The inductive coating provides universal ESD protection that works across all packaging operations and materials. This multi-functional approach eliminates the need for specialized ESD-mitigated IDMs from external vendors, reducing both cost and dependency while maintaining charge accumulation reduction.
Solution Approach 2:
The inductive coating is a thin, cost-effective layer that provides sufficient ESD protection without requiring expensive specialized materials. It enables the use of cost-sensitive packaging materials while maintaining reliability, effectively replacing costly ESD-mitigated IDMs.
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 inductive coating effectively reduces the risk of ESD events by minimizing charge accumulation, allowing for the use of cost-sensitive materials without ESD risk mitigation features, and maintaining minimal impact on device thickness and yield.
Implementation Method 1
A semiconductor device assembly with an inductive coating applied directly to the backside of the semiconductor substrate to reduce charge accumulation by enabling slow dissipation of charge and opposing electron transfer.
Data Source
AI summary
A semiconductor device assembly that includes an inductive coating is disclosed. The semiconductor device assembly includes a semiconductor substrate having circuitry disposed at a first side. A layer of inductive material is disposed at a second side of the semiconductor substrate opposite the first side. A die attach film (DAF) is disposed at the second side of the semiconductor substrate at least partially over the layer of inductive material. The die attach film can be used to attach the semiconductor device assembly to an additional substrate. The layer of inductive material can be disposed at least partially between the semiconductor substrate and the die attach film, which can decrease the damage caused by electrostatic discharge (ESD) events.