Semiconductor Package Bonding With Lightning Conductors for ESD Protection
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Solution Overview
Problem
The accumulation of electrostatic charges during the bonding process of integrated circuit dies can lead to electrostatic discharge, causing damage and reducing the yield and reliability of semiconductor packages.
Innovation Solution
Incorporating lightning conductors on integrated circuit dies to route electrostatic discharge to specific electrostatic discharge wells, thereby preventing damage and allowing for seamless bonding without the need for additional discharge wells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional electrostatic discharge wells are added to handle electrostatic discharge during bonding, then reliability is improved, but device complexity and substrate area usage are worsened
Solution Approach 1:
The patent converts the harmful electrostatic discharge into a beneficial controlled event by designing specific conductive structures (lightning conductors) that intentionally attract and channel the electrostatic discharge current. Instead of trying to prevent electrostatic discharge entirely, the invention provides designated safe pathways for the discharge to occur, transforming a potentially damaging phenomenon into a controlled process that protects the active devices.
Solution Approach 2:
The patent extracts the electrostatic discharge function from the general substrate structure by creating dedicated conductive pathways (lightning conductors) that are separate from the active device interconnect structures. This separation allows the electrostatic discharge to be handled independently through specific wells and conductors, preventing it from interfering with the active circuitry while maintaining reliability.
2Reliability
If additional electrostatic discharge wells are added to handle electrostatic discharge during bonding, then reliability is improved, but substrate area for active devices is reduced
Solution Approach 1:
The patent segments the substrate into distinct functional regions: active device areas, electrostatic discharge well areas, and conductive pathway areas. This segmentation allows each region to be optimized independently - the active device areas can be maximized while the electrostatic discharge infrastructure is concentrated in specific designated zones, reducing the overall area overhead compared to distributing discharge protection across the entire substrate.
Solution Approach 2:
By providing controlled discharge pathways, the patent reduces the need for extensive additional discharge wells scattered across the substrate. The concentrated discharge infrastructure efficiently handles electrostatic events while minimizing the area consumed, thereby preserving more substrate area for active devices while maintaining reliability.
3Ease of manufacture
If electrostatic discharge is allowed to occur during bonding, then manufacturing simplicity is improved, but damage to integrated circuit dies occurs
Solution Approach 1:
The patent accepts the inevitability of electrostatic discharge during bonding and converts this harmful phenomenon into a beneficial controlled event. By providing dedicated lightning conductors and discharge wells, the discharge current is channeled through safe pathways that do not damage the active devices, allowing the bonding process to proceed without additional complexity while eliminating the damage risk.
Solution Approach 2:
The patent introduces intermediary structures (lightning conductors and discharge wells) that mediate between the electrostatic discharge event and the active devices. These intermediaries intercept the discharge current and provide a controlled path to ground, preventing the harmful effects from reaching the sensitive circuitry while allowing the bonding process to continue normally.
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 enhances the yield and reliability of semiconductor packages by avoiding damage from electrostatic discharge and optimizing the use of substrate area for active devices.
Implementation Method 1
The accumulation of electrostatic charges during the bonding process of integrated circuit dies can lead to electrostatic discharge, causing damage
Data Source
AI summary
In an embodiment, a method includes: forming a first integrated circuit die, the first integrated circuit die comprising: a first active device along a first substrate; a first electrostatic discharge well along the first substrate; a first bonding pad over the first substrate and electrically connected to the first active device; and a first lightning conductor over the first substrate and electrically connected to the first electrostatic discharge well; forming a second integrated circuit die, the second integrated circuit die comprising: a second active device along a second substrate; a second electrostatic discharge well along the second substrate; a second bonding pad over the second substrate and electrically coupled to the second active device; and a second lightning conductor over the second substrate and electrically connected to the second electrostatic discharge well; and bonding the first integrated circuit die to the second integrated circuit die.