Backside Metallization and Side Protection for Thin Dies
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Solution Overview
Problem
Thin semiconductor dies are prone to damage such as corner cracks or die edge chipping during packaging, leading to yield losses and early failures due to increased risk of damage during device manufacturing.
Innovation Solution
A semiconductor device with a backside metallization layer that projects laterally beyond the side faces and a side face protection layer covering the side faces, along with a solder layer surrounding the side faces for mounting to a device carrier, which provides full-edge support and reduces stress on the die.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the die thickness is reduced to enhance device performance, then electrical and thermal performance is improved, but the risk of die cracks and edge chipping increases
Solution Approach 1:
The patent applies beforehand cushioning by depositing a backside metallization layer that extends beyond the die edges and forming side face protection layers before mounting. These protective structures are prepared in advance to cushion and distribute mechanical stresses during subsequent mounting and operation, preventing cracks and chipping in thin dies while maintaining enhanced electrical and thermal performance.
Solution Approach 2:
The patent employs composite materials by combining the semiconductor die with a backside metallization layer (extending beyond die edges) and side face protection layers (covering vertical side faces). This composite structure provides mechanical reinforcement and stress distribution, enabling thin dies to maintain integrity while achieving improved electrical and thermal performance.
2Power
If the die thickness is reduced, then device performance is enhanced, but the susceptibility to damage during packaging increases
Solution Approach 1:
The backside metallization layer extending beyond die edges and side face protection layers are deposited beforehand to provide cushioning during packaging operations. These pre-applied protective structures absorb and distribute mechanical impacts and stresses encountered during mounting, preventing damage to thin high-performance dies.
Solution Approach 2:
The side face protection layers act as protective shells covering the vertical side faces of the die. These thin film-like protection layers provide mechanical reinforcement without significantly increasing die thickness, enabling thin dies to withstand packaging stresses while maintaining enhanced device performance.
3Power
If the die thickness is reduced, then device performance is improved, but yield losses during production increase
Solution Approach 1:
The protective structures (backside metallization layer extending beyond edges and side face protection layers) are deposited beforehand on all dies in the wafer before thinning and separation. This pre-protection ensures uniform stress distribution during mounting and operation, preventing cracks and chipping that would cause yield losses, thereby enabling high-volume production of thin high-performance dies with maintained yield.
4Power
If the die thickness is reduced, then device performance is enhanced, but early failures in the field increase
Solution Approach 1:
The backside metallization layer extending beyond die edges and side face protection layers provide ongoing cushioning and stress distribution during field operation. This continuous protection prevents mechanical fatigue and crack propagation that would lead to early failures, enabling thin dies to maintain enhanced performance with improved long-term reliability.
Solution Approach 2:
The composite structure of die plus extended backside metallization layer plus side face protection layers provides mechanical reinforcement that prevents crack initiation and propagation during thermal cycling and mechanical stress in field operation. This composite design enables thin dies to achieve both enhanced performance and reduced early failures.
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 configuration significantly reduces the risk of die corner cracks and edge chipping, allowing for ultra-thin chip technology with improved electrical and thermal performance while maintaining die integrity.
Implementation Method 1
A backside metallization layer is deposited over the backside surface
Implementation Method 2
A side face protection layer covers the side faces
Implementation Method 3
a solder layer arranged between the device carrier and the backside metallization layer to mount the semiconductor device to the device carrier
Implementation Method 4
Laser cutting is performed along the grooves through the side face protection material and through the backside metallization layer to separate the wafer into multiple semiconductor devices
Data Source
AI summary
A semiconductor device includes: a semiconductor die having a front side surface, a backside surface opposite the front side surface, and side faces; a backside metallization layer at least partly covering the backside surface of the semiconductor die and projecting laterally outwards beyond the side faces of the semiconductor die; and a protection layer at least partly covering the side faces of the semiconductor die. The backside metallization layer projects laterally outwards beyond the protection layer.