Semiconductor Electrode Insulating Film for 3D Integration
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Solution Overview
Problem
Conventional three-dimensional integration techniques face challenges with electrode deformation during bonding, leading to shorting and device malfunction, especially as electrode pitches decrease, requiring precise alignment and expensive manufacturing equipment.
Innovation Solution
A method involving the formation of insulating films on the sidewalls of electrodes to prevent deformation, using a multilayer conductive structure with a higher melting point metal as the base and a lower melting point metal on top, allowing for thermocompression bonding at reduced temperatures without expensive equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrode pitches are reduced to increase integration density, then the number of electrodes that can be bonded increases, but adjacent solder bumps come into contact causing shorting and device malfunction
Solution Approach 1:
An insulating film is introduced as an intermediary layer between adjacent electrodes. This film prevents direct contact between melted solder bumps during thermocompression bonding, thereby avoiding shorting while allowing reduced electrode pitches for higher integration density
Solution Approach 2:
The insulating film is formed on the electrode surfaces before the thermocompression bonding process. This preliminary protective action ensures that when solder bumps melt and expand during bonding, they cannot bridge adjacent electrodes, thus preventing shorting before it can occur
2Ease of manufacture
If conventional thermocompression bonding is used without insulating films, then the bonding process is simple, but electrode deformation occurs causing shorting between adjacent electrodes
Solution Approach 1:
The insulating film serves as a mediator that prevents harmful interaction between adjacent electrodes during bonding. It allows the use of simpler bonding processes without requiring extremely precise alignment, as the film provides a safety margin against shorting
Solution Approach 2:
The insulating film provides beforehand cushioning by creating a protective barrier that compensates for potential electrode deformation and misalignment during bonding. This cushioning effect prevents shorting even when alignment is not perfectly precise
3Reliability
If high precision alignment equipment is used to prevent shorting, then shorting between adjacent electrodes is reduced, but manufacturing cost increases significantly
Solution Approach 1:
A thin insulating film layer is used as a low-cost, simple protective measure instead of expensive high-precision alignment equipment. The film is inexpensive to apply and provides reliable shorting prevention without requiring complex manufacturing infrastructure
Solution Approach 2:
The insulating film acts as an intermediary solution that achieves reliable shorting prevention through a simple, low-cost method. It replaces the need for expensive precision equipment by providing a passive protective barrier that works with standard bonding processes
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 approach effectively reduces shorting between adjacent electrodes, preventing device malfunctions and allowing for tighter electrode pitches without the need for expensive manufacturing tools, while maintaining reliable bonding performance.
Implementation Method 1
the solder bumps 13 are heated to melt. After that, the solder bumps 13 are cooled and solidified
Implementation Method 2
the solder bumps 13 are cooled and solidified
Implementation Method 3
the solder bumps 13 on the electrode pads 12 are compression-bonded to the electrode pads 22
Data Source
AI summary
A semiconductor device includes a first substrate; a plurality of first electrodes formed on the first substrate; and a first insulating film formed on sidewalls of the plurality of first electrodes. The first insulating film is formed not to fill spaces between the plurality of first electrodes.